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Unit B: Cell structure

Unit B: Cell structure. Animal cell. Liver Cell. Cell membrane. Nucleus. Nucleus. Nuclear pores. FUNCTIONS OF NUCLEUS:. Nuclear membrane/envelope bilayer, separates and contains nuclear contents (DNA).

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Unit B: Cell structure

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  1. Unit B: Cell structure

  2. Animal cell

  3. Liver Cell

  4. Cell membrane

  5. Nucleus

  6. Nucleus

  7. Nuclear pores

  8. FUNCTIONS OF NUCLEUS: • Nuclear membrane/envelope bilayer, separates and contains nuclear contents (DNA). • Nuclear pores: allow mRNA out of nucleus, nucleotides, nutrients & enzymes in. They are made from protein. • Chromatin: Protein & DNA; form chromosomes when cell divides. • Nucleolus:contains rRNA and Ribosomal proteins.

  9. Rough E.R. Studded with ribosomes Site of protein synthesis for proteins meant for export Phospholipids made here Smooth E.R. Detoxifies poisons (found in liver cells) Synthesize steroids The Endoplasmic Reticulum: ER

  10. Endoplasmic Reticulum

  11. Endoplasmic reticulum

  12. Ribosomes

  13. Function of Ribosomes • Made from two protein subunits and rRNA • Some are free, found alone in cytoplasm • Others are attached to the RER • Translation of mRNA into polypeptides or PROTEIN SYNTHESIS!

  14. Ribosome structure:

  15. Mitochondria

  16. Function of Mitochondria: • Cellular Respiration converts energy in Glucose to ATP • C6H12O6 + O2 CO2 + H2O + 38 ATP • Found in large numbers in energetic cells (sperm cells, muscles etc.)

  17. Golgi apparatus Looks like a series of flattened sacules. Appears close to the cell membrane.

  18. Golgi • Packages, modifies and stores molecules. • Forms transport or secretory vesicles • Involved in export of proteins through exocytosis. • Draw diagram page 2 in green book

  19. Lysosomes

  20. Lysosomes: • Contain hydrolytic enzymes (help to perform hydrolysis) for digesting molecules. • These special vacuoles merge with another molecule containing vacuole for cell digestion. • Called “suicide sacs”, contents could destroy cell!

  21. Microtubules, cytoskeleton

  22. Cytoskeleton • Many protein filaments (actin filaments and microtubules) help organize and anchor cell parts.

  23. cilia

  24. Cilia and flagella microtubule arrangement 9+2

  25. Function of cilia and flagella: • Cilia: • Line the respiratory passages and sweep mucus upwards. • Line the oviducts to transport ovum to uterus • Flagella: Propel sperm • towards the ovum.

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