A deficiency of vitamin C may result in
a. beriberi.
b. scurvy.
c. pellagra.
d. hypothyroidism.
e. none of these.
Answer: b
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You are studying a disease that is known to be caused by a single nucleotide change in a single gene, although the effect this change ultimately has on the protein's structure and function is unknown. You have DNA samples from multiple patients that you suspect of having this disease. What is the most efficient way to test the samples for the relevant mutation?
A) Preimplantation genetic diagnosis B) PCR amplification followed by Sanger DNA sequencing C) PCR amplification followed by gel electrophoresis D) High-throughput exome sequencing E) High-throughput genome sequencing
A sudden loud sound such as an explosion is most likely to impair hearing by damaging which of the following?
a. hair cells in the organ of Corti b. the vestibular nerve c. the utricle and saccule d. the otoliths e. the endolymph
Skin fibroblasts arrested in G0 are stimulated near a wound to enter G1 by _______ growth factor.
a. epidermal b. fibroblast c. platelet-derived d. keratinocyte
Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus, while the macronucleus in each
A. divides by meiosis. B. disintegrates. C. is expelled from the cell. D. shrinks and becomes diploid micronuclei. E. fuses with each other.