Which one of the following produces the most potent exotoxin?
A) Bordetella pertussis
B) Corynebacterium diphtheriae
C) Mycobacterium tuberculosis
D) Streptococcus pyogenes
E) Streptococcus pneumoniae
B
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Bioluminescence in Vibrio harveyi is due to an alternate sigma factor that prevents ________ from binding to Lux mRNA, thus allowing translation of bioluminescent genes.
A. antisense B. autoinducing proteins C. phosphate D. ribosomes
Biofilms in the human mouth primarily contain pathogens
Indicate whether the statement is true or false.
Identify the hydrogen ion concentration that represents the lowest pH from the following list:a
1 ? 10?3 b. 1 ? 10?4 c. 1 ? 10?7 d. 1 ? 10?11 e. 1 ? 10?14
In early cell evolution, why would natural selection favor division into equal-sized daughter cells?
a. Splitting into two equal parts is the most energetically efficient method. b. Two daughter cells is the most efficient way to reproduce sexually. c. Splitting into two daughter cells is more efficient for horizontal gene transfer. d. Hypercycles can be maintained by splitting into two.