The Porifera are not considered to display tissue-level organization; however, some zoologists consider the Placozoa to be diploblasts. Two of the following statements are true and support these conclusions. A third statement is also true but does not support the conclusions. Which stotement does NOT support the above conclusions? Multiple Choice The pinacoderm of poriferans is similar to an epithelium, but does not rest on a basal lamina. The upper and lower epidermal layers of placozoans are thought by some zoologists to be derived from ectodermal and endodermat sources. The lower epidermis is thought to be endodermal because of its nutnitive functions. Both the Porifers and Placozoa have cells that are specialized for specific functions, but in addition the Placozos have fibrous contractile cels between upper and lower epidermal layers.
.
Definition of phermones and exocrine glands.pptxdaliamahmoud19
What is Pheromone
Difference between hormones and pheromone
Types of glands (exocrine and endocrine)
exocrine gland its origin and example
Types of exocrine gland (I—II—III)
function of exocrine glands
distribution of exocrine glands
Definition of phermones and exocrine glands.pptxdaliamahmoud19
What is Pheromone
Difference between hormones and pheromone
Types of glands (exocrine and endocrine)
exocrine gland its origin and example
Types of exocrine gland (I—II—III)
function of exocrine glands
distribution of exocrine glands
Compare and contrast eukaryotic and prokaryotic cells. Why do you th.pdfseasonsnu
Compare and contrast eukaryotic and prokaryotic cells. Why do you think their endomembrane
systems are different, is evolution involved? Paragraph format please, be very detailed and the
answer is expected to be long!
Solution
Prokaryote,relatively simple unicellular organism lacking a nucleus and other features found in
the more complex cells of all other organisms,called eukaryotes.In 1938 American biologist
Herbert Copeland proposed that unicellular organisms lacking nuclei be classified in their own
kingdom, Monera, also called Kingdom Prokaryotae.All bacteria were categorized in this newly
established kingdom. This scheme was the first to establish separate kingdoms for prokaryotes
(organisms without nuclei) and eukaryotes (organisms with nuclei).In 1990 American
microbiologist Carl Woese proposed that bacteria be divided into two groups,the archaea,or
archaebacteria,and bacteria, based on their structural and physiological differences.In some
classification systems,the archaea are considered prokaryotes;in others, they are classified in
their own domain, the archaea.Archaebacteria consist of a small group of primitive anaerobes
(organisms that do not require oxygen).They are found in a narrow range of habitats–often in
extreme environments with high temperature,high salt,or high acidity.In contrast, bacteria live in
a wide range of environments with or without oxygen, at various temperatures, and at various
levels of acidity.
In both prokaryotes and eukaryotes,the plasma membrane is composed of two layers of
phospholipid molecules interspersed with proteins,and regulates the traffic that flows in andout
of the cell.The prokaryotic plasma membrane,however,carries out additional functions.It
participates in replication of deoxyribonucleic acid (DNA) for cell division andsynthesis of
adenosine triphosphate (ATP),an energy molecule.In some prokaryotes,the plasma membrane is
essential for photosynthesis,the process that uses light energy to convert carbon dioxide and
water to glucose.
Fossil records indicate that eukaryotes evolved from prokaryotes somewhere between 1.5 to 2
billion years ago.Two proposed pathways describe the invasion of prokaryote cells by two
smaller prokaryote cells.They subsequently became successfully included as part of a now much
larger cell with additional structures and capable of additional functions.They are Endosymbiosis
and Membrane infolding.ProkaryotesEukaryotessize is 0.1-5.0 micrometressize is 5-100
micrometresnucleus is absentnucleus made of nuclear
envelope,chromatin,nucleoplasm,nucleoliDNA is circularDNA is linearDNA is naked and not
assosciated with histonesDNA is associated with histonesplasmids may occurplasmids are
rare.cell membrane have in folding called as mesosomemesosome is absentmitochondria are
absentpresentribosomes are 70S80Sgolgi apparatus,ER,lysosomes,centrosome absentall are
presentsexual reproduction is absentsexual reproduction occurs.endocytosis and exocytosis are
absentthey occur in e.
Structure, Development & Function of PeridermFatima Ramay
A group of secondary tissues forming a protective layer which replaces the epidermis of many plant stems, roots, and other parts.
Although periderm may develop in leaves and fruits, its main function is to protects stems and roots.
The periderm consists of three different layers:
Phelloderm
Phellogen (cork cambium)
Phellem (cork)
Its main function is to protect the underlying tissues from:
Desiccation
Freezing
Heat injury
Mechanical destruction
Disease
Loss of epidermis.
Bounding tissue restricting the pathogen & insects.
Allowing gaseous exchange through lenticels.
the name of the course is lifespan development Moving to another ques.docxNeilAc9Petersz
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The media pictured here detects which of the following- Select one- a-.docxNeilAc9Petersz
The media pictured here detects which of the following: Select one: a. lactose fermentation b. fermentation of mannitol c. oxidation or fermentation d. hemolysis What specifically makes CNA selective? Select one: a. eosin b. sodium chloride c. neutral red d. lactose e. nalidixic acid CNA is a media used to isolate Select one or more: a. streptococci b. enterococci c. Gram negative bacteria d. coliforms e. staphylococci
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1. The Porifera are not considered to display tissue-level organization; however, some zoologists
consider the Placozoa to be diploblasts. Two of the following statements are true and support
these conclusions. A third statement is also true but does not support the conclusions. Which
stotement does NOT support the above conclusions? Multiple Choice The pinacoderm of
poriferans is similar to an epithelium, but does not rest on a basal lamina. The upper and lower
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and endodermat sources. The lower epidermis is thought to be endodermal because of its
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functions, but in addition the Placozos have fibrous contractile cels between upper and lower
epidermal layers.
