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
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Which statement factors into artificial but not natural selection?
A. Most organisms are capable of producing more offspring than typically survive. B. Phenotypic variation of a species has variable appeal to humans interested in that species. C. Phenotypic variation exists within populations. D. Phenotypic variation can influence reproductive success. E. Phenotypic variation within a species is due in part to inherited characteristics.
Many spirochetes are difficult to cultivate, so their classification is based on their
A. morphology and ability to cause disease. B. number of flagella. C. pattern of pili. D. number of chromosomes.
The force needed to keep a ball rolling toward a bowling pin is
What will be an ideal response?
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?
A. lack of telomerase activity B. defects in DNA repair C. shortened telomeres D. defects in DNA replication