In many species, lens crystalline protein aggregates in the eyes to form lenses, yet in other cell types, functions as an enzyme. The gene that encodes this protein is therefore
A) pleiotropic.
B) incompletely penetrant.
C) eclectic.
D) mutant.
A) pleiotropic.
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The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, the muscles that control the ventilation rate are acting as the:
A. homeostatic challenge. B. sensor. C. effector. D. integrator. E. set point.
A higher protein concentration within the distal portion of capillaries draws water into them through the process of
A. diffusion. B. facilitated diffusion. C. active transport. D. filtration. E. osmosis.
What does the membranous compartmentalization of a cell do
What will be an ideal response?
Which feature is not associated with aging of the musculoskeletal system?
A. a decrease in the muscle mass starting in the 20s or 30s for men B. compression of the vertebrae C. a reduction in the size and number of muscle fibers D. a two-inch decrease in height by the time we reach age 80 E. All of these are features associated with aging.