DNA methylation is the only known natural modification of DNA. It affects
A. adenine bases.
B. guanine bases.
C. cytosine bases.
D. thymine bases.
C. cytosine bases.
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In the absence of a repressor, where will RNA polymerase bind to a prokaryotic operon to initiate transcription?
a. transcriptional start site b. operator c. promoter d. coding region
Which of the following is responsible for closing off the airway during swallowing?
a. the larynx b. the epiglottis c. the pharynx d. the intercostal muscles
The theory of chromosomal inheritance was first proposed by
A. Mendel. B. Morgan. C. Sutton. D. Knight. E. Stern.
What is the correct sequence of organisms if a community is going through secondary succession?a. grasses establish themselves in the communityb. shrubs establish themselves in the communityc. soil formation occursd. trees establish themselves in the community
A. a - b - c - d B. c - a - d - b C. a - c - b - d D. c - a - b - d E. d - c - a - b