A sample of single stranded RNA was found to have a cytosine content of 22%. What is the expected proportion of guanine in this RNA?
a. 22%
b. 28%
c. 44%
d. cannot be determined from this information
Ans: d. cannot be determined from this information
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In RNAi, imperfect pairing of miRNA to target mRNA results in ____ while perfect pairing of miRNA to target
mRNA causes ____.
a. blocking transcription of the target mRNA; mRNA degradation b. blocking translation of the target mRNA; mRNA degradation c. recruitment of siRNA; blocking translation of the target mRNA d. mRNA degradation; recruitment of siRNA e. blocking transcription of the target mRNA; blocking translation of the target mRNA
If one person in 50 is a carrier of an autosomal recessive disorder in a population, the chance that an unrelated man and woman are both carriers is
A) 1/50. B) 1/100. C) 1/1000. D) 1/2500.
Which statement is true?
a. Once a vaccine for a virus has been developed, further vaccine development is unnecessary. b. Antiviral drug therapy is safer than vaccination because there is no risk of tissue damage involved. c. Viruses nearly eliminated by mass immunization campaigns can still cause epidemics. d. Vaccinations contain dangerous quantities of chemicals such as mercury and formaldehyde.
HIV is effectively transmitted by
a. food. b. air. c. water. d. casual contact. e. bodily fluids.