In which ponds did male guppies have the narrowest range of variation in the number of spots?
a. ponds with no predators
b. ponds with cichlids
c. ponds with killifish
a
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Sometimes a single-stranded molecule of RNA is able to fold back on itself because the nucleotide sequence on one part of the RNA is complementary to another part. This sequence motif results in a:
A. transcription factor binding site. B. hairpin-shaped structure. C. chromosome scaffold. D. negative supercoil. E. positive supercoil.
Which of the following is not true of the regulation of translation initiation in eukaryotes?
A. Repressors bind to the 3' untranslated region of mRNA. B. Repressors bind to initiation factors. C. Repressors bind to translational start sites of mRNA. D. Repressors bind to translational release factors.
Four of the five answers listed below are related by a similar gland. Select the exception
a. goiter b. deficiency of iodine in the diet c. hypothyroidism d. rickets e. excessive stimulation of the thyroid gland
An immunoassay was developed to rapidly diagnose patients infected with an emerging virus. However, the researchers discovered that some individuals were producing false negatives when tested, despite being infected with the virus. What might explain this?
A. number of genome copies carried in each virion B. rapid evolution of the viral antigen C. changes in the length of the viral DNA D. changes in the antibody produced by the virus