The functional group that forms covalent bonds between R groups within a polypeptide and that stabilizes tertiary structure is
A. ?SH
B. ?OH
C. ?COOH
D. ?NH2
E. ?PO4
Answer: A
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While documenting the synthesis and function of a eukaryotic gene, you prepare two solutions in which you are able to observe the gene being transcribed. Before the process is complete, you add a significant quantity of ?-amanitin to one solution, and compare the results after a few minutes. You find that the DNA in both solutions has been completely transcribed. What conclusion do you draw?
a. The gene is transcribed by RNA polymerase III. b. The gene is transcribed by RNA polymerase II. c. The gene is transcribed by RNA polymerase I. d. ?-amanitin has no effect on DNA transcription.
Which of the following is the most commonly used stop codon in most mRNA molecules?
A) UGA B) AUG C) AAA D) GAA E) CAG
Two nuclei are formed during
A. prophase I. B. metaphase I. C. anaphase I. D. telophase I.
Enzymes are catalysts because they speed up chemical reactions. How do they speed up the reaction?
What will be an ideal response?