How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule via glycolysis and the Krebs cycle?
a) 2
b) 3
c) 4
d) 5
e) 6
Answer: e) 6
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When Thomas Hunt Morgan began studying white-eyed fruit flies, the first observation he made that departed from the results he expected based on Mendelian principles was that:
A. the offspring of a white-eyed male and wildtype (red-eyed) female all had red eyes. B. white eyes reappeared in his second generation crosses (matings between brothers and sisters produced from the first cross). C. white eyes appeared only in males. D. white eyes appeared only in females. E. white eyes appeared in both males and females.
Which event occurs in mitosis but NOT in meiosis?
a. bipolar spindle formation b. tethering of chromosomes to microtubules c. chromosomes dragged to poles by microtubules d. nuclear envelopes breaking up and reforming e. none of these
Which of the following molecules does not act as a second messenger?
a. protein kinase b. IP3 c. DAG d. calcium ions e. cyclic AMP
Which statement about cancer defense is FALSE?
a. Natural killer and T cytotoxic cells destroy cancer cells. b. Cancer antigens stimulate a strong immune response. c. Monoclonal antibodies can deliver toxic drugs to cancer cells.
d. T cells produce interleukins, which defend against cancer. e. Macrophages produce tumor necrosis factor, which inhibits tumor growth.