The chromosomal heredity material is packaged in this organelle in eukaryotic cells but not in prokaryotic cells. This organelle is:
A. mitochondria
B. plasma membrane
C. centrioles
D. chloroplasts
E. nucleus
E. nucleus
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The genetic material (DNA) of eukaryotes is organized into
(a) centrioles. (b) spindles. (c) chromosomes. (d) microtubules.
Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor?
A. The repressor binds directly to the RNA polymerase to block the closed-to-open transition at initiation. B. The repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. C. The binding of the repressor sterically occludes binding of the RNA polymerase to the promoter. D. The repressor binds directly to the DNA to stabilize the closed complex over the open complex.
A patient who is positive for the human immunodeficiency virus (HIV) is diagnosed with a Cryptococcus neoformans infection. The attending resident prescribed Griseofulvin; however, the patient's condition did not seem to improve. Which one of the following statements explains this discrepancy?
a. The dose should be increased to penetrate the blood-brain barrier. b. Nystatin, which would have been more effective, should have been prescribed. c. Griseofulvin is not effective against C. neoformans; therefore the therapy should be changed. d. Potassium iodide is the therapy of choice, not griseofulvin.
The allele T is in 85 percent of a population (p=0.85). According to the Hardy-Weinberg equation, what percentage of the population will have the recessive allele t (q=?)?
A) 15% B) 50% C) 85% D) 0%