Herd immunity fails if at least what percentage of a population is unvaccinated?
A) 1%
B) 5%
C) 10%
D) 20%
Answer: B
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Mutations are more likely to occur in repeated DNA sequences because
A) these bases are unstable. B) bases in the strand can form base pairs, generating loops that interfere with replication and repair enzymes. C) the repeats hold onto the replication enzymes, causing base mismatches. D) the repeats attract and bind to mutagens, increasing the mutation rate.
In a monohybrid cross AA × aa, what proportion of homozygotes is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are homozygotes. E) None are homozygotes.
An example of a fluid feeder is a
a. hummingbird. b. lamprey. c. mosquito. d. snake. e. hummingbird and a mosquito.
The virulence factors attributed to Erysipelothrix rhusiopathiae include:
A. The presence of capsule to resist phagocytosis B. Cell attachment factors C. Production of hyaluronidase and neuraminidase D. Only 'A' and 'B' E. All of the above