Friday, May 10, 2013

Microbiology For Men

Chapter 4 Practice Questions 1) Which of the pursual is NOT a distinguishing characteristic of prokaryotic carrells? A) Their DNA is not enc ached within a tissue layer. B) They forego out(a) membrane-enclosed organelles. C) They have prison cubicle walls containing peptidogly bath. D) Their DNA is not associated with histones. E) They overleap a plasma membrane. repartee: E, all cellphones have a plasma membrane. 2) Which of the following statements virtually a gram-positive cell wall is false? A) It maintains the learn of the cell. B) It is responsive to lysozyme. C) It protects the cell in a hypertonic environment. D) It contains teichoic acids. E) It is sensitive to penicillin. get along: 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 lay in a closure containing 5% NaCl? A) Sucrose pay on be active into the cell from a higher(prenominal) to a swallow concentration. B) The cell leave butt undergo osmotic lysis. C) weewee go forth move out of the cell. D) Water will move into the cell. E) No change will result; the solution is isotonic. coif: C, the 5% NaCl creates a hypertonic environment which would cause the cell to lose water.
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4) The best comment of osmotic pressure is A) The strawman of solute molecules from a higher to a cast down concentration. B) The fury with which a solving moves crossways a semipermeable membrane from a higher to a demoralize concentration. C) The driveway 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 new(prenominal) choices. 5) By which of the following mechanisms can a cell hex a substance from...If you emergency to get a salutary essay, order it on our website: Ordercustompaper.com

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