The very first level of packaging eukaryotic DNA is the:
A. 30-nm chromatin fiber.
B. nucleosome.
C. beads on a string.
D. both the 30-nm chromatin fiber and beads
on a string.
E. None of the answer options is correct.
D
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A key influence of the atrioventricular node on the heartbeat is to
A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles. D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles. E. block backflow of blood from the aorta into the right ventricle.
An endocrine gland is
A. required for remodeling bone. B. the site at which hormones are produced and released into the blood. C. where neuronal signals are generated. D. restricted to the production of growth factors.
Which of the following is a vector used to deliver genes in human gene therapy?
A) Parvovirus B) Rabies virus C) Adeno-associated virus D) E. coli
The amount of rain an area gets is part of an organism's
A. biotic factors. B. abiotic factors. C. community. D. succession.