What would result if a cell underwent mitosis but did not complete cytokinesis?
A) one cell with one nucleus containing twice the normal number of chromosomes
B) one cell with two nuclei
C) two daughter cells with no nucleus
D) two daughter cells with too few chromosomes
B
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Sandpipers are known to: a. be territorial of their beaches
b. feed on worms and fish. c. be very solitary birds. d. make long annual migrations.
The effect of parathyroid hormone on blood chemistry is most directly opposed by the effect of
a. Thyroid-stimulating hormones. b. thyroxin. c. calcitonin. d. melatonin. e. cortisol.
Prior to the onset of lactation, the mammary glands are prepared for the production of milk by
A) the hormonal action of estrogen and progesterone. B) the completion of ovulation. C) degeneration of the corpus luteum. D) deactivation of FSH, LH, and GnRH. E) synthesis of FSH.
Oxygen levels in the photic zone fluctuate over the course of a 24-hour period. If you were measuring dissolved oxygen over the course of the day, when would you expect to see the lowest levels of oxygen and why?
A. Early evening when animals come to feed and disturb the surface waters. B. Early afternoon when the surface water warms up and sinks to the bottom. C. Mid-morning because fish are most active and their respiration rates are highest. D. Mid-afternoon because the activity of the Calvin cycle (the dark reactions) of photosynthesis are at their peak. E. During the night because the light reactions of photosynthesis are inactive.