How many nucleotides form the code for one amino acid?
A. 2 D. 5
B. 3 E. 6
C. 4
B
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Primary RNA transcripts can be spliced differently so that the primary transcripts generated from a single gene can give rise to more than one kind of processed mRNA transcript and thus more than one kind of protein
A. true B. false
Given the structure of the anti-HIV drug azidothymidine (AZT), how do you think it blocks viral replication?
a. It blocks RNA synthesis b. It inhibits host T cells from replicating c. It inhibits the assembly of new viruses in the cell d. It blocks DNA synthesis e. It prevents HIV from entering the cell
The process in which the intercostal muscles contract, pulling the rib cage upward and outward and causing the lungs to inflate, is called ________
A) inspiration B) expiration C) exhalation D) deflation
In Endler's (1980) studies, the evolution of male guppy coloration is affected by predation and sexual selection. What effect on brightness do the two forces have?
A. Predation: increases; Sexual selection: decreases B. Predation: decreases; Sexual selection: increases C. Predation: decreases; Sexual selection: decreases D. Predation: increases; Sexual selection: increases