Which of the following statements is TRUE?
(a) proto-oncogenes cause a loss of control of the cell cycle
(b) the products of oncogenes may inhibit the cell cycle
(c) tumor suppressor gene products inhibit the cell cycle
(d) a mutation in a tumor suppressor gene may inhibit the cell cycle
Ans: (c) tumor suppressor gene products inhibit the cell cycle
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What event results from the hydrolysis of ATP to ADP by the myosin head?
A. cross-bridge formation B. shortening of the muscle fiber C. cocking of myosin head to its high-energy position D. the power stroke
Which of the following statements about marine bony fish is false?
A. Chloride cells in the gills actively pump chloride ions into the body. B. They maintain a body fluid solute concentration that is lower than that of the surrounding seawater. C. They drink water to replenish water supplies. D. They are osmoregulators. E. They tend to lose water through osmosis.
HIV specifically targets cells of the ________ system
a. cardiovascular b. immune c. respiratory d. digestive
The progress of the eukaryotic cell cycle is regulated primarily by what proteins?
A. FtsZ B. cyclins C. histone proteins D. condensins