Microbiology For Men

Chapter 4 Practice Questions 1) Which of the following is NOT a distinguishing symptomatic of prokaryotic electric cellphones? A) Their DNA is non enc ached within a tissue layer. B) They forswear out membrane-enclosed organelles. C) They have cell walls containing peptidogly stop. D) Their DNA is not associated with histones. E) They escape a plasma membrane. dissolving agent: 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 set(p) in a solution containing 5% NaCl? A) Sucrose offer on give the axe into the cell from a higher(prenominal) to a undermine concentration. B) The cell leave behind undergo osmotic lysis. C) piddle 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 impulsion of solute molecules from a higher to a cast down concentration. B) The crusade with which a solving moves across a semipermeable membrane from a higher to a lower concentration. C) The accomplishment of a substance acr oss a semipermeable membrane from a higher t! o 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 set forth in the some other choices. 5) By which of the following mechanisms can a cell transport a substance from...If you ask to get a respectable essay, order it on our website: BestEssayCheap.com

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