What result would you expect if a mutation eliminates one of the four arms of a tRNA?
A) The tRNA will fit into the A site but will not release the peptide at the P site.
B) The tRNA will not be recognized by tRNA synthetase and cannot be charged.
C) The tRNA will be charged with the wrong amino acid.
D) The tRNA will not be able to undergo traditional complementary base pairing.
E) There will be no effect on function, so long as the anticodon region is intact.
B
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Which of the following statements in TRUE?
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. B. Euchromatin, found in interphase cells, is readily visible and easily viewed. C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms. D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin. E. All choices are correct.
A species that is confined to a specific, relatively small geographic area is called
a. endemic. b. allopatric. c. sympatric. d. autopolyploid. e. polymorphic.
Can one gene make different proteins?
A. No, because genes do not make proteins B. No, because one gene codes only for a single protein C. Yes, by modifying the original DNA D. Yes, by splicing the resulting mRNA differently (i.e., removing different exons)
Which of the following is NOT a main function of B lymphocytes?
A) To produce an antibody B) To present pathogens C) To digest pathogens D) To activate T-lymphocytes E) To produce interleukins