Myosin is a motor protein that associates with:
a. microtubules.
b. intermediate filaments.
c. microfilaments.
d. vimentin.
Ans: c. microfilaments.
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Examine the figure above, which shows indices of aquatic and terrestrial primary productivity. Based on concentrations of chlorophyll, primary productivity in the ocean
A. is uniform, since the ocean is a single continuous body of water. B. tends to increase with increase temperatures, from the poles to the equator. C. is greatest in the open ocean, due to less air pollution and cloud cover. D. is usually high in warm, tropical seas. E. tends to be high near polar regions, due to seasonal mixing that redistributes nutrients.
In addition to creating a new plasma membrane during cell division, prokaryotes must also create a new _____.
a. nucleus b. Golgi body c. cell wall d. smooth ER
Functional magnetic resonance imaging is used to observe brain function by:
a. examining intracellular second messengers. b. monitoring gene activation. c. examining changes in blood flow to different parts of the brain. d. measuring neurotransmitter-receptor binding effectiveness. e. measuring hormone levels.
The sickle-cell allele produces a serious blood disease in homozygotes. Why doesn't natural selection eliminate this allele from all human populations?
A) Natural selection is a positive force, so it does not eliminate alleles. B) In populations where endemic malaria is present, heterozygotes have an important advantage: They are resistant to malaria and therefore are more likely to survive and produce offspring that carry the allele. C) Mutations keep bringing the allele back into circulation. D) Natural selection occurs very slowly, but elimination of the sickle-cell allele is expected to occur soon.