All of the following are characteristic of Corynebacterium diphtheriae EXCEPT

A. Gram-positive club-shaped rods with metachromatic granules
B. Humans are the only known reservoir
C. It produces a single "A-B" exotoxin that inhibits eukaryotic protein synthesis
D. Avirulent stains acquire their virulence factors from virulent strain through plasmids
E. Avirulent strains acquire their virulence factors from virulent strain through lysogenic phages


Ans: D. Avirulent stains acquire their virulence factors from virulent strain through plasmids

Biology & Microbiology

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The minimum inhibitory concentration (MIC) result recorded in antimicrobial testing can be defined as the:

a. lowest concentration of antimicrobial agent that should be used for optimal therapy. b. highest concentration of antimicrobial agent that should be used for optimal therapy. c. lowest antimicrobial agent concentration that completely inhibits visible bacterial growth. d. highest antimicrobial agent concentration that completely inhibits visible bacterial growth.

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Which of these hydrocarbons has a double bond in its structure?

a. C3H8 b. C2H6 c. CH4 d. C2H4 e. C2H2

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Agar is produced by

a. brown algae. b. red algae. c. phycobilins. d. brown and red algae. e. red algae and phycobilins

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Urey and Miller's experimental setup was able to produce all twenty of the amino acids found in proteins. Some amino acids contain the element oxygen. What starting material in the Urey-Miller experiment was source of this element?

a) methane b) ammonia c) hydrogen gas d) water e) electrical sparks

Biology & Microbiology