A Cell Structure

May 20th, 2015
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1. DNA not surrounded by, nuclear, envelope / membrane ; AW A no (true) nucleus2. circular DNA ; A loop 3. DNA not complexed with histone proteins ; A naked DNA 4. (only) 70S / smaller / 18nm, ribosomes ; A ribosomes

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A Cell StructureFeatures of prokaryotes:1. DNA not surrounded by, nuclear, envelope / membrane ; AW A no (true) nucleus2. circular DNA ; A loop3. DNA not complexed with histone proteins ; A naked DNA4. (only) 70S / smaller / 18nm, ribosomes ; A ribosomes not attached to membranes5. no double membrane-bound organelles; A no, mitochondria / chloroplasts6. absence of named organelle ; e.g. Golgi apparatus, ER / RER / SERif previous mp not given, A no membrane-bound organelles7. capsule / slime layer ;8. very small diameter / 0.5 to 5.0m ;9. cell wall of, murein / peptidoglycan ;examples of other relevant points10. pili / pilus ;11. no 9+2 microtubule arrangement ;12. flagellum not covered by cell surface membrane ;13. presence of plasmids ;B Biological MoleculesFunction of collagen in the wall of arteries:1. withstands pressure ;2. prevents, overstretching / AW ;3. prevents, bursting / rupture / AW ;Structure of collagen vs. Haemoglobin:1. 1 polypeptides are not identical (v. 2 identical, / , polypeptides) ;2. triple helix or three, polypeptides / helices (v. 4 polypeptides) ;3. only composed of amino acids or no, prosthetic group / haem / iron ;4. (fibrous so) not globular ;5. no complex folding / AW (v. complex folding) ; A no tertiary structure6. glycine is repeated every 3rd position / more glycine ;7. repeating triplets of amino acids / large number repeating amino acid sequences (v. greater variety) ;8. AVP ; e.g. different primary

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