Which statement correctly represents the function of telomeres?
A. Telomeres are protective caps on the ends of chromosomes that help the cell age.
B. Telomeres are protective caps on the ends of chromosomes that allow the chromosome to stick to other chromosomes.
C. Telomeres are protective caps on the ends of chromosomes that help stabilize them.
D. Telomeres are protective caps on the ends of chromosomes that help them replicate.
Answer: C
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Which of the choices below explains why the arterioles are known as resistance vessels?
Their prime function is the exchange of nutrients and wastes between the blood and tissue cells. The contraction and relaxation of the smooth muscle in their walls can change their diameter. They distribute blood to various parts of the body. They contain a large quantity of elastic tissue.
Motor commands are carried by ________ from the brain along the spinal cord.
A. descending tracts B. both anterior and posterior roots C. ascending tracts D. cranial nerves E. spinal nerves
Pulmonary arteries have ________ blood pressure compared to systemic arteries.
A. considerably lower B. a little higher C. similar D. a little lower E. considerably higher
If the charge difference across the plasma membrane is decreased,
A. the membrane potential is more positive. B. negative proteins can leave the cell. C. the change is called hyperpolarization. D. the potential difference across the plasma membrane does not change. E. the membrane potential is more negative.