The presence of DNA is important for cellular metabolic activities because DNA

a. directs the production enzymes
b. is a structural component of cell membrane
c. directly increases the solubility of nutrients
d. is a major component of the cytoplasm


Answer: a. directs the production enzymes

Biology & Microbiology

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Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder. Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation, a high incidence of skin cancer, and premature aging. Based on these clinical characteristics, what is the most likely cause for this disease?

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Which statement factors into artificial but not natural selection? 

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