Fertilization is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
Answer: a
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Which of the following is not affected by DNA supercoiling?
A. translation B. transcription C. replication D. DNA repair E. Neither replication nor DNA repair are affected by supercoiling.
A road that dichotomizes is
a. an intersection of two crossroads. b. a road that forks into two roads. c. a road that has numerous entrances and exits. d. a road that leads nowhere.
Rubisco is an important enzyme in the Calvin cycle because it acts as a carboxylase to catalyze addition of carbon dioxide and water to ribulose-1,5-bisphosphate, which then forms two molecules of 3-phosphoglycerate
Rubisco also acts as an oxygenase to catalyze addition of molecular oxygen rather than carbon dioxide to ribulose-1,5-bisphosphate. a) What is (are) the product(s) of the rubisco oxygenase reaction activity and why is this a problem for plants? b) Explain why rubisco's much lower affinity for oxygen than for carbon dioxide does not mitigate the rubisco oxygenase problem for plants. c) Identify the pathway plants use to metabolize the problematic product of rubisco oxygenase and the final fate of its carbons. d) Explain why the oxygenase activity of rubisco is particularly problematic for plants in arid environments. e) What strategies do plants in arid environments use to deal with this problem? What will be an ideal response?
Following peptide bond formation between the amino acid in the A site on the ribosome and the
growing polypeptide chain, the tRNA in the A site:a. releases the growing polypeptide chain. b. picks up another amino acid to add to the chain. c. moves to the P site of the ribosome. d. forms a peptide bond with A site of the ribosome. e. forms a covalent bond with the P site of the ribosome