An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?
A) The enzyme is subject to regulation.
B) The enzyme requires a cofactor to function normally.
C) The protein's structure is affected by temperature and pH.
D) The protein has quaternary structure.
Answer: D
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When plants reduce SO4 to form H2S during ____________, SO4 ___________ electrons
A. assimilation; gains B. assimilation; loses C. anammox; gains D. anammox; loses E. anaerobic respiration; gains F. anaerobic respiration; loses
Which site on the ribosome does the new tRNA bring an amino acid to?
A. E B. A C. P D. C
Which of the following statements best describes the end result of bacterial conjugation?
a. The two cells have had an equal exchange of plasmids. b. One cell has lost a plasmid, while the other cell has gained one. c. One cell has lost a chromosome, while the other has gained one. d. One cell has given a copy of a plasmid to another cell and kept one copy for itself.
You have a series of cells, some of which are cancerous. How might you determine which cells are cancerous?
A. Identify the cells that are not dividing uncontrollably. B. Identify the cells that have increased rates of cell death. C. Identify the cells with abnormal chromosome number or structure. D. Identify the cells that utilize Ras protein for growth inhibitory signals.