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This document provides an overview of cell structure and function. It begins by stating that all living things are made up of cells, which are the basic functional units. It then describes the key aspects of cell theory: that cells make up all living things, cells are the basic functional unit, and new cells are produced from existing cells. The document goes on to explain the differences between prokaryotic and eukaryotic cells, including their structures. It also compares and contrasts plant and animal cells. In closing, it briefly outlines the levels of organization in living things from cells to organisms.
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(b)Vessels members: long, cylindrical, tube-like structures with lignified walls.
(2)Fibres: thick walls, evolve from tracheids and provide mechanical strength. Two types,
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(b)Libriform fibres: very thick walls, have reduced simple pits.
Parenchyma cells: living cells, in woody plants, store of food in starch form. Two types:
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(b)Ray parenchyma: derived from ray initials of cambium, xylem ray cells.
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1. The cell is the fundamental unit of structure and function in all living organisms.
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1. The cell is the fundamental unit of structure and function in all living organisms.
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1. Cells are the basic unit of structure and function of living things. Microscopes allowed scientists like Hooke and Leeuwenhoek to first observe cells in the 1600s.
2. The Cell Theory established that all living things are made of cells, cells are the basic functional units of life, and new cells are produced from existing cells.
3. Cells can be either prokaryotic without organelles or eukaryotic with organelles like a nucleus. Organelles perform specific functions like mitochondria which produce energy and chloroplasts which facilitate photosynthesis.
Notes Cell Structure and Function.slide share pdf
1. Cells are the basic unit of structure and function of living things. Microscopes allowed scientists like Hooke and Leeuwenhoek to first observe cells in the 1600s.
2. The Cell Theory established that all living things are made of cells, cells are the basic functional units of life, and new cells are produced from existing cells.
3. Cells can be either prokaryotic without organelles or eukaryotic with organelles like a nucleus. Organelles perform specific functions like mitochondria which produce energy and chloroplasts which facilitate photosynthesis.
Cell structure 2013
Plant and animal cells contain organelles that carry out essential functions. Key organelles include the nucleus, which controls cell activities, mitochondria which generate energy, and the cell membrane which regulates what enters and exits the cell. Plant cells additionally contain a cell wall, chloroplasts for photosynthesis, and larger vacuoles for storage. While organelles vary in shape and function, they work together within cells to keep organisms alive.
cell.pptx
1. The cell is the basic structural and functional unit of all living organisms.
2. Cell theory states that all living things are made of cells, cells come from pre-existing cells, and cells are the basic units of structure and function.
3. Key parts of the cell include the plasma membrane, nucleus, and cytoplasm, which contains various organelles like mitochondria, endoplasmic reticulum, Golgi bodies, lysosomes, and vacuoles.
Cell organelles.pptx
This document summarizes the key organelles found within eukaryotic cells, including their structures and functions. It describes the nucleus as the control center that contains DNA, the cell membrane as the boundary, and mitochondria as the powerhouse that generates energy. It also outlines other important organelles like the endoplasmic reticulum for protein transport, ribosomes for protein synthesis, Golgi apparatus for packaging molecules, lysosomes for waste breakdown, chloroplasts for food production in plants, and vacuoles for storage.
Cell structure anmd function
This document provides information about cell structure and function in a science class for 8th grade students. It defines key terms like cell, unicellular and multicellular organisms. It describes some of the first observations of cells under a microscope. The summary also outlines the basic components of cells, including the plasma membrane, nucleus, cytoplasm, and cell wall in plant cells. It provides examples of unicellular organisms like yeast and bacteria, as well as multicellular organisms like plants and animals. Finally, it describes the functions of the main cell structures like the plasma membrane, nucleus, and cell wall.
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This document provides information about cell structure and function in a science class for 8th grade students. It defines key terms like cell, unicellular and multicellular organisms. It describes some of the first observations of cells under a microscope. The document outlines the basic components of cells, including the plasma membrane, nucleus, cytoplasm, and cell wall in plant cells. It provides examples of unicellular organisms like bacteria and multicellular organisms like plants and humans. Finally, it describes the functions of the plasma membrane, nucleus, and cell wall in plant cells.
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This document provides information about cell structure and function in a science class for 8th grade students. It defines key terms like cell, unicellular and multicellular organisms. It describes some of the first observations of cells under a microscope. The document outlines the basic components of cells, including the plasma membrane, nucleus, cytoplasm, and cell wall in plant cells. It provides examples of unicellular organisms like bacteria and multicellular organisms like plants and humans. Finally, it describes the functions of the plasma membrane, nucleus, and cell wall in plant cells.
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(cell structure) medical biology
- 1. CELLS, STRUCTURE AND FUNCTION BY Assist lecturer : Asawer Kareem
- 2. INTRODUCTION • All living things are made up of cells. Cells are the smallest units that can be alive. During the 1950’s scientists developed the concept that life on earth is classified into six kingdoms and each have their own characteristic kind of cell.
- 3. What was the cell ?? • Every thing we know about cells we call “ cell theory”. • 1. All living things are composed of cells. • 2. Cells are the basic unit of structure and function in living things. • 3. New cells are produced from existing cells Virchow
- 4. Number of Cells • Although ALL living things are made of cells, organisms may be: • Unicellular – composed of one cell • Multicellular- composed of many cells.
- 6. The basic types of cells with STRUCTURAL differences. Eukaryotes Animal Plant Bacteria Prokaryotes
- 8. Prokaryotic • No nucleus • Few internal structures • have simple ribosomes • Smaller & simpler than eukaryotic cells • Ex. Bacteria
- 9. Eukaryotic • Have a membrane bound nucleus, control center that holds DNA (genetic material) • Contain organelles surrounded by membranes (small organs) • Most living organisms • Larger & more complex than prokaryotic cells
- 10. Prokaryotic Cell Eukaryotic Cell • The Cell Wall • The Plasma Membrane • The Cytoplasm • The Genetic Material • The Ribosomes • The Cell Wall • The Plasma Membrane • The Nucleus • The Nuclear Membrane • The Nucleolus • The Mitochondria • The Chloroplast • The Endoplasmic Reticulum • The Ribosomes • The Golgi Bodies • The Lysosomes • The Vacuoles • The Cytoplasm • The Chromosomes
- 11. Two Main Types of Eukaryotic Cells 11 Plant Cell Animal Cell
- 13. Similarities between plant cells and animal cells Both have a cell membrane surrounding the cytoplasm Both have a nucleus Both contain mitochondria
- 14. 14 Differences between plant cells and animal cells Relatively smaller in size Irregular shape No cell wall Relatively larger in size Regular shape Cell wall present
- 15. 15 Animal cells Plant cells Vacuole small or absent Glycogen as food storage Nucleus at the center Large central vacuole Starch as food storage Nucleus near cell wall Differences between Plant Cells and Animal Cells
- 16. 16 Different kinds of animal cells white blood cell red blood cell cheek cells sperm nerve cell muscle cell Amoeba Paramecium
- 17. Cell wall Nonliving layer Gives structure and shape to plant and bacterial cells
- 18. Cell membrane Surrounding the Cell Lies immediately against the cell wall in plant cells Made of protein and phospholipids Selectively permeable
- 19. Cytoplasm of a Cell Jelly-like substance Between the cell surface membrane and the nucleus Contains enzymes and organelles as: • Mitochondria ,Ribosomes, Chloroplasts (only in plant cells) , Cell vacuoles etc.…
- 20. Nucleus • Surrounded by a membrane called the nuclear envelope • Contains one or more nucleoli • Contains chromatin • Functions of the nucleus: • 1. Controls cell activities such as; cell growth and the repair of worn-out parts • 2. Essential for cell division
- 21. Nucleolus • Cell may have 1 to 3 nucleoli Inside nucleus • Disappears when cell divides • Makes ribosomes that make proteins
- 22. Smooth & Rough Endoplasmic Reticulum Smooth ER: no ribosomes; makes lipids Rough ER: has ribosomes ; making proteins
- 23. Mitochondria • Rod shape Site of Cellular respiration • Aerobic respiration occurs in the mitochondria Energy production • Energy used to perform cell activities such as growth and reproduction
- 24. Cell Differentiation The process by which cells develop to carry out specific functions.
- 25. 25 Levels of Organization CELLS (muscle cells , nerve cells) TISSUES (muscle, epithelium) ORGANS (heart, lungs, stomach) SYSTEMS (circulatory system) ORGANISM (human)
- 26. Living Levels Cell Tissue Organs System Organism
- 27. Thank you