practice questions for test 1-answered (1)

practice questions for test 1-answered (1) - Multiple...

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1. A Gram negative bacterium a. Has no peptidoglycan in its cell wall. b. Has less LPS than a gram positive bacterium. c. Contains a layer of teichoic acid. d. All contain endotoxin . e. Is not effectively treated with ionizing radiation. 2. If a bacteria makes β -lactamase, it a. Has the ability to cleave the side chain off semisynthetic antibiotics. b. Can make a sex pilus to transfer genetic material. c. Produces an enzyme that inactivates lipid A. d. Is producing an antibiotic that targets the 70S ribosome. e. Can destroy the β -lactam ring structure of penicillin G. 3. Koch’s postulates a. Prove that viruses are infectious agents. b. Prove that a specific microbe is related to a specific disease. c. Were actually proven by Pasteur. d. Identified cow pox as a treatment for smallpox. e. Show how bacteria can acquire a capsule. 4. Which of the following will always affect the primary structure of a protein? a. Frameshift mutation. b. Different codon usage. c. Silent mutation d. Base substitution e. None of the above 5. Hfr + cells a. Are products of transformation. b. Usually transfer a complete F + factor to a recipient cell. c. Are unable to generate a sex pilus. d. Must be competent to receive DNA. e. Contain a complete F + factor. 6. During which growth phase will gram-positive bacteria be least susceptible to penicillin? a. Lag phase b. Stationary phase c. Log phase d. The culture is equally susceptible during all phases. e. Lytic phase
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This note was uploaded on 03/20/2008 for the course MICR 255 taught by Professor Kramer during the Spring '07 term at UNC.

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practice questions for test 1-answered (1) - Multiple...

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