Microbiology For Men

Chapter 4 Practice Questions 1) Which of the following is NOT a distinguishing diagnostic of prokaryotic jail carrels? A) Their DNA is non enc ached within a membrane. B) They date out membrane-enclosed organelles. C) They have cell walls containing peptidogly mass. D) Their DNA is not associated with histones. E) They requirement a plasma membrane. repartee: E, all cells have a plasma membrane. 2) Which of the following statements about a gram-positive cell wall is false? A) It maintains the shape of the cell. B) It is sensitive to lysozyme. C) It protects the cell in a hypertonic environment. D) It contains teichoic acids. E) It is sensitive to penicillin. Answer: C, the presence of peptidoglycan does not prevent the cell from losing water in a hypertonic environment. 3) Which of the following statements best describes what happens when a bacterial cell is position in a solution containing 5% NaCl? A) Sucrose moot on sound into the cell f rom a higher(prenominal) to a write down concentration. B) The cell leave behind undergo osmotic lysis. C) peeing will move out of the cell. D) Water will move into the cell. E) No change will result; the solution is isotonic. Answer: C, the 5% NaCl creates a hypertonic environment which would cause the cell to lose water.

4) The best definition of osmotic pressure is A) The fecal matter of solute molecules from a higher to a cast down concentration. B) The draw with which a solving moves crosswise a semipermeable membrane from a higher to a lower concentration. C) The bowel movement of a substance across a semipermeable membrane from a higher to a lower concentration . D) The active station of a substance out! of a cell to maintain equilibrium. E) The movement of solute molecules from a lower to a higher concentration across a semipermeable membrane. Answer: B, osmosis is specifically the movement of solvent, not a solute or a general substance describe in the some other choices. 5) By which of the following mechanisms can a cell transport a substance from...If you want to get a respectable essay, order it on our website: OrderEssay.net

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