Many marine mollusks have distinctive larvae which have their bodies encircled by a row of cilia. These larvae are called
A. planulae.
B. zoecia.
C. trochophores.
D. miracidia.
E. polyps.
Answer: C
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You notice that your houseplants are all growing toward the light from your window. This indicates that their stems display:
A. positive gravitropism. B. positive thermotropism. C. positive phototropism. D. negative phototropism. E. negative gravitropism.
Mammals are thought to have evolved from
A. thecodonts. B. therapsids. C. dinosaurs. D. marsupials. E. archosaurs.
Heterozygotes for the sickle-cell allele show higher fitness than either homozygote genotype in malarial regions. This is an example of
A) epistasis. B) pleiotropy. C) founder effect. D) overdominance. E) codominance.
Which of the following is a primary advantage of semisynthetic drugs?
A) They are less stable and consequently have fewer side effects. B) They work faster. C) They are more effective than the unmodified natural antibiotics. D) They must be administered intravenously. E) They are not readily absorbed.