A prolonged period without rain is causing a major drought in the American Midwestern states. How would you expect crops to respond initially to the stress caused by the drought?
A. They will take in more carbon dioxide.
B. They will release more oxygen.
C. They will take in less carbon dioxide.
D. They produce fewer secondary metabolites.
E. They will increase rates of photosynthesis.
Answer: C
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A mutation that results in premature termination of translation _____
A) is a silent mutation B) is a nonsense mutation C) usually has no effect on the function of the protein D) is a missense mutation
Found mostly in freshwater, members of this Lophotrochozoan phylum have a wheel-like, ciliated
food-gathering organ around their head called a corona. Some members of this phylum make extensive use of parthenogenesis for reproduction.
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
When heart valves do not close fully and a turbulence is created within the heart, this can be heard using a stethoscope and is known as
A. a lub dub. B. atherosclerosis. C. a heart murmur. D. a major heart defect.
A mutation that results in a change in the codon-reading pattern could result from
A) either an insertion or a deletion of a base. B) a base substitution only. C) a base deletion only. D) a base insertion only.