Vertebrate cells possess a protein that binds to clusters of 5-methylcytosine and ensures the gene will stay in the "off" position. This control of gene regulation is a result of
A. translation.
B. enhancer expression.
C. methylation.
D. promoter expression.
E. operator suppression.
C. methylation.
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Disruptive selection favors
a. the intermediate forms. b. an extreme at one end of a range of variation. c. the extremes at both ends of a range of variation. d. a greater number of individuals in the center of the bell-shaped curve. e. neutral traits.
In gymnosperms and angiosperms, a plant embryo (young sporophyte) packaged with a food supply in a tough outer coat is a
A. sperm. B. seed. C. pollen grain. D. gemmae. E. fruit.
The proteins, myosin and ribose play a key role in contraction of muscle fibers. Indicate whether the statement is true or false
The major divisions of the peripheral nervous system are the ____.
A. somatic and autonomic systems B. sympathetic and parasympathetic systems C. peripheral and central systems D. afferent and autonomic systems E. cranial and skeletal nerves