In which of the following does the environment play a causal role?
A. Marfan syndrome
B. Cystic fibrosis
C. Dog coat color
D. Sickle-cell anemia
E. Depression and schizophrenia
Answer: E
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Psilotum lacks
(a) roots. (b) a mechanism to take up water and minerals. (c) vascular tissue. (d) alternation of generations.
The slow-growing organism Trichophyton rubrum produces a flat or heaped-up colony, generally white to reddish with a cottony or velvety surface. The cherry-red color is best observed on the reverse side of the colony. This organism is capable of infecting which of the following?
a. Hair and nails b. Skin and nails c. Hair and skin d. Hair, skin, and nails
AIDS is short for
a. Acquired Immune Deficiency Syndrome. b. Accelerated Immune Death Syndrome. c. Accentuated Induced Deficiency Syndrome. d. Advantageous Immunity Deficiency Syndrome. e. none of these.
Mutation is the only evolutionary mechanism that _____
A) does little to change allele frequencies B) is more important in eukaryotes than in prokaryotes C) happens in all populations D) has no effect on genetic variation