Transcriptionally active chromatin tends to:
A. be devoid of nucleosomes.
B. be deficient in histone H1.
C. contain sites hypersensitive to in vitro treatment with DNase I.
D. All of the choices are true for transcriptionally active chromatin.
D
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Arranging homologous pairs of chromosomes in order from longest to shortest is called:
A. a karyotype. B. chromosome painting. C. chromosome numbering. D. a nuclear genome. E. Both chromosome painting and chromosome numbering are correct.
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.
Which best describes a result of sexual reproduction?
a. The only source of variation is mutation. b. Clones of the original cell are produced. c. One cell divides to produce two identical cells. d. Two sex cells combine to form a fertilized cell. e. The offspring obtain genes only from one parent.
Which of the following is a function of the myelin sheath?
Increases the rate of conduction of a nerve impulse Moves sodium and potassium ions by active transport Protects the dendrites of motor neurons All of the above