Cells are the basic unit of life that perform all life functions. There are two major cell types: prokaryotic and eukaryotic cells. Prokaryotic cells like bacteria are simpler and lack internal membranes, while eukaryotic cells like plant and animal cells have internal membranes and organelles. Eukaryotic cells allow for multicellular organisms through cell specialization.
This PowerPoint was one very small part of my Cellular Biology Unit from the website www.sciencepowerpoint.com . Teaching Duration = 4+ Weeks
This unit includes an interactive and engaging 3 part PowerPoint Presentation of 2,200+ slides with built-in class notes (Red Slides), lab activities with instructions and visuals, project ideas, discussion questions, assessments, challenge questions with answers, 3 review games (150 slides each), video and activity links, and much more
Text is provided in large print (32 font) and is placed at the top of each slide so it can read from all angles of a classroom. A shade technique and color coded text helps to increase student focus and allows teacher to control the pace of the lesson. Also included is a 11 page bundled homework package that chronologically follows the PowerPoint slideshow as well as a 8 page modified assessment. 16 pages of class notes (Word doc.) with images are also included for students who require assistance, as well as answer keys to both of the assessments for support professionals, teachers, and homeschool parents. 13 video shorts (.flv files) and several video and activity links are provided. A slide within the slideshow cues teacher / parent when the videos are most relevant to play. Video shorts usually range from 2-7 minutes and are included in organized folders. Three PowerPoint review games (125+ slides) is included. Answers to the PowerPoint review game is provided in PowerPoint form so students can self-assess. Lastly, several class games such as guess the hidden picture beneath the boxes, and the find the hidden owl somewhere within the slideshow are provided. Difficulty rating of 9 (Ten is most difficult).
Areas of Focus within The Cell Biology Unit.
Cellular Biology, History of Cellular Biology, Modern Cell Theory, Types of Cells, Prokaryotic Cells, Eukaryotic Cells, Cellular Organelles, Cell Wall, Plasma Membrane, Passive Transport, Diffusion, Osmosis, Active Transport, The Nucleus, Chromatin / Chromosomes, Nucleolus, Nuclear Membrane, Rough Endoplasmic Reticulum, Smooth Endoplasmic Reticulum, Ribosomes, Protein Synthesis, Golgi Apparatus, Lysosomes, Cytoskeleton / Microtubules / Microfilaments, Centrioles, Plastid, Photosynthesis, Mitochondria, Cellular Respiration, Vacuoles, Organelles by real images.
This unit is aligned with the Next Generation Science Standards and Common Core Standards for ELA and Literacy for Science and Technical Subjects. Topics covered and standards addressed can be found at the end of this slideshow.
Thank you for your time and interest. If you have any questions please feel free to contact me. Best wishes.
Sincerely,
Ryan Murphy M.Ed
www.sciencepowerpoint@gmail.com
This PowerPoint was one very small part of my Cellular Biology Unit from the website www.sciencepowerpoint.com . Teaching Duration = 4+ Weeks
This unit includes an interactive and engaging 3 part PowerPoint Presentation of 2,200+ slides with built-in class notes (Red Slides), lab activities with instructions and visuals, project ideas, discussion questions, assessments, challenge questions with answers, 3 review games (150 slides each), video and activity links, and much more
Text is provided in large print (32 font) and is placed at the top of each slide so it can read from all angles of a classroom. A shade technique and color coded text helps to increase student focus and allows teacher to control the pace of the lesson. Also included is a 11 page bundled homework package that chronologically follows the PowerPoint slideshow as well as a 8 page modified assessment. 16 pages of class notes (Word doc.) with images are also included for students who require assistance, as well as answer keys to both of the assessments for support professionals, teachers, and homeschool parents. 13 video shorts (.flv files) and several video and activity links are provided. A slide within the slideshow cues teacher / parent when the videos are most relevant to play. Video shorts usually range from 2-7 minutes and are included in organized folders. Three PowerPoint review games (125+ slides) is included. Answers to the PowerPoint review game is provided in PowerPoint form so students can self-assess. Lastly, several class games such as guess the hidden picture beneath the boxes, and the find the hidden owl somewhere within the slideshow are provided. Difficulty rating of 9 (Ten is most difficult).
Areas of Focus within The Cell Biology Unit.
Cellular Biology, History of Cellular Biology, Modern Cell Theory, Types of Cells, Prokaryotic Cells, Eukaryotic Cells, Cellular Organelles, Cell Wall, Plasma Membrane, Passive Transport, Diffusion, Osmosis, Active Transport, The Nucleus, Chromatin / Chromosomes, Nucleolus, Nuclear Membrane, Rough Endoplasmic Reticulum, Smooth Endoplasmic Reticulum, Ribosomes, Protein Synthesis, Golgi Apparatus, Lysosomes, Cytoskeleton / Microtubules / Microfilaments, Centrioles, Plastid, Photosynthesis, Mitochondria, Cellular Respiration, Vacuoles, Organelles by real images.
This unit is aligned with the Next Generation Science Standards and Common Core Standards for ELA and Literacy for Science and Technical Subjects. Topics covered and standards addressed can be found at the end of this slideshow.
Thank you for your time and interest. If you have any questions please feel free to contact me. Best wishes.
Sincerely,
Ryan Murphy M.Ed
www.sciencepowerpoint@gmail.com
The presentation gives an overview of Cell & Molecular Biology for Under-graduate students of Indian Universities. For Practical aspects, students may refer 'Research Techniques in Genetics, Molecular Biology & Biotechnology - HK Garg & Jaya Garg LAMBERT Academic Publishing, Germany'.
Cell Definition
What is a Cell?
Discovery of Cells
Who discovered cells?
Characteristics of Cells
Types of Cells
Prokaryotic Cells
Eukaryotic Cells
Cell Structure
Cell Membrane
Cell Wall
Cytoplasm
Nucleus
Cell Organelles
Functions of Cell
Cell Theory
The presentation gives an overview of Cell & Molecular Biology for Under-graduate students of Indian Universities. For Practical aspects, students may refer 'Research Techniques in Genetics, Molecular Biology & Biotechnology - HK Garg & Jaya Garg LAMBERT Academic Publishing, Germany'.
Cell Definition
What is a Cell?
Discovery of Cells
Who discovered cells?
Characteristics of Cells
Types of Cells
Prokaryotic Cells
Eukaryotic Cells
Cell Structure
Cell Membrane
Cell Wall
Cytoplasm
Nucleus
Cell Organelles
Functions of Cell
Cell Theory
A cell is the structural and fundamental unit of life.
The study of cells from their basic structure to the functions of every cell organelle is called Cell Biology.
Robert Hooke was the first Biologist who discovered cells.
All organisms are made up of cells. They may be made up of a single cell (unicellular), or many cells (multicellular).
Mycoplasmas are the smallest known cells.
Cells are the building blocks of all living beings. They provide structure to the body and convert the nutrients taken from the food into energy.
Cells are complex and their components perform various functions in an organism. They are of different shapes and sizes, pretty much like the bricks of the buildings. Our body is made up of cells of different shapes and sizes.
Cells are the lowest level of organisation in every life form. From organism to organism, the count of cells may vary. Humans have more cells compared to that bacteria.
Cells comprise several cell organelles that perform specialised functions to carry out life processes. Every organelle has a specific structure. The hereditary material of the organisms is also present in the cells.
in this ppt, i had discuss about cell,its structure,function.types of cells, plant and animal cell.and difrrence between plant and animal cell / prokaryotic and eukaryotic cell.
Most relevant information about the cell, its discovery, types and various kinds of organelles and their function. it also focus on how molecules are transported across the cell membrane.
2018/2019
This is a Presentation describing the structure and different functions of many cell organelles. This describes cells, types of cells, prokaryotic cells, eukaryotic cells, cell membrane, cytoplasm, mitochondria, nucleus, nucleolus, vacuoles, endoplasmic reticulum, Golgi apparatus, ribosomes, lysosomes, cell wall, and plastids.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
TESDA TM1 REVIEWER FOR NATIONAL ASSESSMENT WRITTEN AND ORAL QUESTIONS WITH A...
Cell basics
1. • Cells are the basic unit of life. In the
modern world, they are the smallest known
Cells in the world that performs all of life’s
functions.
• All living organisms are either single cells, or
are multicellular organisms composed of
many cells working together.
Cell definition Function of Cells How Cell Works Cell Types
Cell Definition
2. Learning objectives
Standards
• Cells are the smallest known unit that can accomplish all of these
functions. Defining characteristics that allow a cell to perform these
functions include:
•A cell membrane that keeps the chemical reactions of life together.
• At least one chromosome, composed of genetic material that contain
the cell’s “blueprints” and “software.”
• Cytoplasm – the fluid inside the cell, in which the chemical processes
of life occur.
we will discuss Futher about the functions of the cells that must fulfill in
order to facilitate life, and how they fulfill these functions.
ABOUT CELL
3. Scientists define seven functions that must be fulfilled by a living organism. These are:
• A living thing must respond to changes in its environment.
• A living thing must grow and develop across its lifespan.
• A living thing must be able to reproduce, or make copies of itself.
• A living thing must have metabolism.
• A living thing must maintain homeostasis, or keep its internal environment the
same regardless of outside changes.
• A living thing must be made of cells.
• A living thing must pass on traits to its offspring.
• It is the biology of cells which enables living things to perform all of these
functions.
we discuss how they make the functions of life possible.
FUNCTIONS OF CELL
4. 2. Discuss and question
How Cell Works
In order to accomplish them, they must have:
• A cell membrane that separates the inside of the cell from the outside. By
concentrating the chemical reactions of life inside a small area within a membrane,
cells allow the reactions of life to proceed much faster than they otherwise would.
• Genetic material which is capable of passing on traits to the cell’s offspring. In order
to reproduce, organisms must ensure that their offspring have all the information that
they need to be able to carry out all the functions of life.
• All modern cells accomplish this using DNA, whose base-pairing properties allow
cells to make accurate copies of a cell’s “blueprints” and “operating system.” Some
scientists think that the first cells might have used RNA instead.
• Proteins that perform a wide variety of structural, metabolic, and reproductive
functions.
5. 2. Discuss and question
• There are countless different functions that cells must perform to obtain energy
and reproduce.
• Depending on the cell, examples of these functions can include photosynthesis,
breaking down sugar, locomotion, copying its own DNA, allowing certain
substances to pass through the cell membrane while keeping others out, etc.
• Proteins are made of amino acids, which are like the “Legos” of biochemistry.
Amino acids come in different sizes, different shapes, and with different
properties such as polarity, ionic charge, and hydrophobicity.
• By putting amino acids together based on the instructions in their genetic
material, cells can create biochemical machinery to perform almost any function.
• Some scientists think that the first cells might have used RNA to accomplish some
vital functions, and then moved to much more versatile amino acids to do the job
as the result of a mutation.
The different cell types ,we will discuss in Next class which is having different ways of
accomplishing these functions.
9. 2. Discuss and question
Cell Types
• Because of the millions of diverse species of life on Earth,
which grow and change gradually over time, there are
countless differences between the countless extant types of
cells.
• However, here we will look at the two major types of cells,
and two important sub-categories of each.
10. 2. Discuss and question
Prokaryotes
• Prokaryotes are the simpler and older of the two major types of cells.
Prokaryotes are single-celled organisms. Bacteria and archaebacteria are
examples of prokaryotic cells.
• Prokaryotic cells have a cell membrane, and one or more layers of additional
protection from the outside environment.
• Many prokaryotes have a cell membrane made of phospholipids, enclosed
by a cell wall made of a rigid sugar.
• The cell wall may be enclosed by another thick “capsule” made of sugars.
• Many prokaryotic cells also have cilia, tails, or other ways in which the cell
can control its movement.
11. 2. Discuss and question
Prokaryote cell
• These characteristics, as well as the cell wall and capsule,
reflect the fact that prokaryotic cells are going it alone in
the environment.
• They are not part of a multicellular organism, which
might have whole layers of cells devoted to protecting
other cells from the environment, or to creating motion.
• Prokaryotic cells have a single chromosome which
contains all of the cell’s essential hereditary material and
operating instructions.
• This single chromosome is usually round. There is no
nucleus, or any other internal membranes or organelles.
The chromosome just floats in the cell’s cytoplasm.
12. 2. Discuss and question
• Additional genetic traits and information might be contained in other gene
units within the cytoplasm, called “plasmids,” but these are usually genes that
are passed back and forth by prokaryotes though the process of “horizontal
gene transfer,” which is when one cell gives genetic material to another.
• Plasmids contain non-essential DNA that the cell can live without, and which is
not necessarily passed on to offspring.
• When a prokaryotic cell is ready to reproduce, it makes a copy of its single
chromosome. Then the cell splits in half, apportioning one copy of its
chromosome and a random assortment of plasmids to each daughter cell.
Prokaryotes
13. 2. Discuss and question
• There are two major types of prokaryotes known to scientists to date:
archaebacteria, which are a very old lineage of life with some biochemical
differences from bacteria and eukaryotes, and bacteria, sometimes called
“eubacteria,” or “true bacteria” to differentiate them from archaebacteria.
• Bacteria are thought to be more “modern” descendants of archaebacteria.
• Both families have “bacteria” in the name because the differences between
them were not understood prior to the invention of modern biochemical
and genetic analysis techniques.
Prokaryote
14. 2. Discuss and question
Prokaryotes
• When scientists began to examine the biochemistry and genetics of prokaryotes in
detail, they discovered these two very different groups, who probably have different
relationships to eukaryotes and different evolutionary histories!
• Some scientists think that eukaryotes like humans are more closely related to
bacteria, since eukaryotes have similar cell membrane chemistry to bacteria. Others
think that archaebacteria are more closely related to us eukaryotes, since they use
similar proteins to reproduce their chromosomes.
• Still others think that we might be descended from both – that eukaryotic cells might
have come into existence when archaebacteria started living inside of a bacterial cell,
or vice versa! This would explain how we have important genetic and chemical
attributes of both, and why we have multiple internal compartments such as the
nucleus, chloroplasts, and mitochondria!
17. 2
Eukaryotic cells are thought to be the most modern major cell type. All
multicellular organisms, including you, your cat, and your houseplants, are
eukaryotes. Eukaryotic cells seem to have “learned” to work together to create
multicellular organisms, while prokaryotes seem unable to do this.
Eukaryotic cells usually have more than one chromosome, which contains large
amounts of genetic information. Within the body of a multicellular organism,
different genes within these chromosomes may be switched “on” and “off,”
allowing for cells that have different traits and perform different functions
within the same organism.
Eukaryotes
18. 2. Discuss and question
• Eukaryotic cells also have one or more internal membranes, which has led scientists
to the conclusion that eukaryotic cells likely evolved when one or more types of
prokaryote began living in symbiotic relationships inside of other cells.
• Organelles with interior membranes found in eukaryotic cells typically include:
• For animal cells – Mitochondria, which liberate the energy from sugar and turn it into
ATP in an extremely efficient way.Mitochondria even have their own DNA, separate
from the cells’ nuclear DNA, which gives further support for the theory that they used
to be independent bacteria.
Eukaryotes
19. • For plant cells – Chloroplasts, which perform photosynthesis, making ATP and
sugar from sunlight and air.
• Chloroplasts also have their own DNA, suggesting that they may have originated
as photosynthetic bacteria.
• Nucleus – In eukaryotic cells, the nucleus contains the essential DNA blueprints
and operating instructions for the cell.
• The nuclear envelope is thought to provide an extra layer of protection for the
DNA against toxins or invaders which might damage it.
• It is unknown whether the nucleus might also have been an endosymbiotic
prokaryote at one time, or whether its membrane simply evolved as an extra layer
of protection for the cell’s DNA.
20. 2. Discuss and question
• Endoplasmic reticulum – This complex internal membrane is a major site of protein
creation for cells. The evolutionary origin of the endoplasmic reticulum is not known.
• Golgi apparatus – This internal membrane complex can be thought of like the endoplasmic
reticulum’s “post office.” It receives proteins from the ER, packages and “labels” them by
attaching sugars as needed, and then ships them off to their final destinations!
• Others – Many eukaryotic cells can create temporary internal membrane “sacs,” called
“vacuoles,” to store waste, or to package important materials.
• Some cells, for example have special vacuoles called “lysosomes” which are full of corrosive
substances and digestive enzymes. Cells simply dump their “trash” into lysosomes, where the
harsh environment breaks them down into simpler components that can be re-used!
21. 2. Discuss and question
Examples of Cells Archaebacteria
• As mentioned above, archaebacteria are a very old form of prokaryotic cells. Biologists
actually put them in their own “domain” of life, separate from other bacteria.
• Key ways in which archaebacteria differ from other bacteria include:
• Their cell membranes, which are made of a type of lipid not found in either bacteria or
eukaryotic cell membranes.
• Their DNA replication enzymes, which are more similar to those of eukaryotes than
those of bacteria, suggesting that bacteria and archae are only distantly related, and
archaebacteria may actually be more closely related to us than to modern bacteria.
22. 2. Discuss and question
Some archaebacteria have the ability to produce methane, which is a metabolic process not
found in any bacteria or any eukaryotes.
Archaebacteria’s unique chemical attributes allow them to live in extreme environments,
such as superheated water, extremely salty water, and some environments which are toxic
to all other life forms.
Scientists became very excited in recent years at the discovery of Lokiarchaeota – a type of
archaebacteria which shares many genes with eukaryotes that had never before been found
in prokaryotic cells!
It is now thought that Lokiarchaeota may be our closest living relative in the prokaryotic
world.
25. 2. Discuss and question
• You are most likely familiar with the type of bacteria that can make you sick. Indeed,
common pathogens like Streptococcus and Staphylococcus are prokaryotic bacterial
cells.
• But there are also many types of helpful bacteria – including those that break down
dead waste to turn useless materials into fertile soil, and bacteria that live in our own
digestive tract and help us digest food.
• Bacterial cells can commonly be found living in symbiotic relationships with
multicellular organisms like ourselves, in the soil, and anywhere else that’s not too
extreme for them to live!
26. 2. Discuss and question
Plant Cells
• Plant cells are eukaryotic cells that are part of multicellular, photosynthetic organisms.
• Plants cells have chloroplast organelles, which contain pigments that absorb photons of light and
harvest the energy of those photons.
• Chloroplasts have the remarkable ability to turn light energy into cellular fuel, and use this
energy to take carbon dioxide from the air and turn it into sugars that can be used by living
things as fuel or building material.
• In addition to having chloroplasts, plant cells also typically have a cell wall made of a rigid
sugars, to enable plant tissues to maintain their upright structures such as leaves, stems, and tree
trunks.
• Plant cells also have the usual eukaryotic organelles including a nucleus, endoplasmic reticulum,
and Golgi apparatus.
27. 2. Discuss and question
Animal Cells
• For this exercise, let’s look at a type of animal cell that is of great importance to you:
your own liver cell.
• Like all animal cells, it has mitochondria which perform cellular respiration, turning
oxygen and sugar into large amounts of ATP to power cellular functions.
• It also has the same organelles as most animal cells: a nucleus, endoplasmic
reticulum, Golgi apparatus, etc..
• But as part of a multicellular organism, your liver cell also expresses unique genes,
which give it unique traits and abilities.
• Liver cells in particular contain enzymes that break down many toxins, which is
what allows the liver to purify your blood and break down dangerous bodily waste.
28. • The liver cell is an excellent example of how multicellular organisms can
be more efficient by having different cell types work together.
• Your body could not survive without liver cells to break down certain
toxins and waste products, but the liver cell itself could not survive without
nerve and muscle cells that help you find food, and a digestive tract to
break down that food into easily digestible sugars.
• And all of these cell types contain the information to make all the other
cell types! It’s simply a matter of which genes are switched “on” or “off”
during development.