Which of the following results in a spontaneous mutation?

A. free radicals produced by cellular metabolism
B. exposure to ultraviolet light
C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke
D. exposure to ultraviolet light and benzo (a)-pyrene
E. exposure to X-rays


A. free radicals produced by cellular metabolism

Biology & Microbiology

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Homology is evidence of ________.

A. .natural selection B. binomial classification C. artificial selection D. common ancestry

Biology & Microbiology

In the overall reactions of photosynthesis, it appears that hydrogen atoms are transferred from water to

carbon dioxide to form a carbohydrate. This type of reaction is classified as: a. a redox reaction. b. an anaerobic reaction. c. a catabolic reaction. d. an oxidation reaction. e. a hydrolytic reaction.

Biology & Microbiology

Nonprotein coding pieces of pre-mRNA that are removed during RNA splicing are called ________

A) introns B) exons C) SNPs D) promoters E) poly(A) tails

Biology & Microbiology

A student needs information from the National Institutes of Health, a government agency. Which one of the following endings should he or she look for in the Internet address?

A) edu B) com C) gov D) nih E) org

Biology & Microbiology