Which of the following is not true regarding the protein CDK?
A. The levels of CDK change with the cell
cycle.
B. It binds to cyclin.
C. It functions as a kinase.
D. It functions to control the cell cycle.
A
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DNA supercoils that result from overwinding produce ____ supercoils
Fill in the blank with the appropriate word.
When scientists are attempting to breed for increased ability of a plant to utilize carbon dioxide they must consider improvement of:
A. stomatal openings B. bundle-sheath cells C. mesophyll air spaces D. chlorophyll production E. stress tolerance
The reason that an action potential is so brief is that
a. a wave of repolarization immediately follows the rising portion of the spike. b. the closing of potassium gates allows the voltage difference across the neural membrane to be restored. c. the channels for sodium movement remain open. d. the sodium-potassium pump restores the electrical gradients. e. the membrane limits electrical activity.
A __________ is an underground stem that is greatly enlarged for food storage
a. sucker b. runner c. plantlet d. stolon e. tuber