Neurons and some other specialized cells divide infrequently because they _____
A) no longer have active nuclei
B) no longer carry receptors for signal molecules
C) have entered into G0
D) can no longer bind Cdk to cyclin
E) show a drop in MPF concentration
Answer: C
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A. topoisomerase I B. topoisomerase II? C. topoisomerase II? D. type II topoisomerases only E. All these topoisomerases can relax negative supercoiling.
The digestion of proteins in humans begins in the
a. large intestine. b. mouth. c. pancreas. d. small intestines. e. stomach.
What is the shape of cocci?
A. Linear B. Tubular C. Oval D. Spherical E. Spring-like
The formation of carbohydrate (CO2 fixation) in the dark reaction of photosynthesis, takes place in the ________.
A. stroma B. thylakoid membrane C. cytoplasm D. nucleus