Which of the following is NOT an essential element
for most land plants?
a. sodium, Na
b. potassium, K
c. copper, Cu
d. molybdenum, Mo
e. iron, Fe
Answer: a
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Reddish-purple coloring of leaves, especially along the margins of young leaves, is a typical symptom of deficiency of which element?
A) C B) Mg2+ C) N D) P E) K+
Which of the following is NOT a function of the integumentary system?
A. defense against pathogens B. fluid transport C. supporting the weight of body structures D. protection from dehydration E. regulation of body temperature
The nematode Caenorhabditis elegans is important to human medicine because it
A. causes elephantiasis, a disease of the lymph glands that causes the legs of humans to swell. B. is an intestinal parasite in human digestive tracts. C. has programmed cell death and therefore is useful in cancer and AIDS research. D. is transmitted by mosquitoes and causes high fevers.
Which of the following stimulates spermatogenesis?
a. Gonadotropin-releasing hormone b. Testosterone c. Progesterone d. Luteinizing hormone