Which of the following cell types would have the highest concentration of metabolic enzymes?
A. nerve cell
B. mammary cell
C. lung cell
D. liver cell
E. cartilage cell
D. liver cell
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Chemotherapeutic agents that are chemically modified natural products of microorganisms are most specifically referred to as ________.
A. semisynthetic drugs B. antimicrobial agents C. antibiotics D. synthetic drugs
The integrase enzyme of bacteriophage ? is required to:
A. excise the prophage from the host genome. B. degrade phage mRNA during lysogenic growth. C. bypass terminator structures downstream from the N and Cro genes. D. combine multiple DNA segments to make new genes.
Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over b (brown), and
D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what genotype(s) result in a white mouse (no pigment)?
a. BBdd only b. Bbdd only c. bbDD only d. bbDd only e. BBdd and Bbdd
The frequency of the allele that causes sickle cell disease is higher in some populations than in others because
A) the gene mutates at different frequencies in different parts of the world. B) the incidence of malaria differs in different parts of the world. C) sickle cell disease screening is better in developed countries. D) heterozygotes are resistant to cholera.