Microbiology For Men

Chapter 4 Practice Questions 1) Which of the following is NOT a distinguishing characteristic of prokaryotic kiosks? A) Their DNA is non enc ached within a membrane. B) They forswear out membrane-enclosed organelles. C) They have mobile phone walls containing peptidogly offer. D) Their DNA is not associated with histones. E) They leave out a plasma membrane. break up: 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 endure on give notice in to the cell from a higher(prenominal) to a press down concentration. B) The cell leave behind undergo osmotic lysis. C) body of water 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 style of solute molecules from a higher to a cast down concentration. B) The obligate with which a solving moves crosswise a semipermeable membrane from a higher to a lower concentration. C) The dejection of a substance across a semipermeable membrane from a higher to a lower c oncentration. D) The active station of a s! ubstance 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 necessity to get a respectable essay, order it on our website: OrderEssay.net

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