Why do some physicians advise patients with a bladder infection to drink a lot of cranberry juice?
A) Cranberry juice contains chemicals that kill viruses and bacteria.
B) The increased volume of fluid in the bladder causes bacterial cells to burst as they absorb the excess fluid.
C) Cranberry juice makes the urine more acidic, decreasing the rate at which microorganisms can grow and reproduce.
D) Cranberry juice increases the efficiency of urine production by the kidneys.
E) Cranberry juice enhances the action of phagocytic cells.
C
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Birds have
A. a backcurrent lung. B. an air sac lung. C. a parabronchial lung. D. a negative pressure lung. E. a tracheal lung.
Which statement describes the production of offspring by wingless female aphids?
a. Wingless female aphids can produce clones of female offspring by laying eggs. b. When the amount of food available in the environment increases, the number of male offspring increases. c. Wingless female aphids only produce female clones, and these clones are made without the mother laying eggs. d. Different proportions of winged male, non-egg-laying female, and egg-laying female offspring are produced based on the temperature and amount of daylight. e. Environmental conditions do not affect the sexuality of wingless female aphid offspring; sexuality is only determined genetically.
Air rushes into the lungs of humans during inhalation because
A. pulmonary muscles contract and pull on the outer surface of the lungs. B. smooth muscle lining the trachea, bronchi, and bronchioles contracts and causes their volume to increase. C. the diaphragm contracts and pushes upward on the chest cavity. D. pressure in the alveoli increases. E. the volume of the thoracic cavity increases.
If one excludes the involvement of gender in the situation described in the paragraph above, then the pattern that is apparent in the fossil record is most similar to one that should be expected from
A) pansexual selection. B) directional selection. C) disruptive selection. D) stabilizing selection. E) asexual selection.