Which of the following anemias is associated with destruction of the bone marrow?
a. aplastic
b. megaloblastic anemia
c. hemolytic anemia
d. leukemia
e. iron-deficiency anemia
A
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Alternation of generations means:
A. One phase of the life cycle takes place on land and the other in water. B. One phase of the life cycle is photosynthetic and the other is heterotrophic. C. One phase of the life cycle is diploid and the other is haploid. D. One phase of the life cycle is unicellular and the other is multicellular. E. One phase of the life cycle is motile and the other is stationary.
In 2012, the Midwest experienced unusually hot, dry conditions for long periods during the
summer months. As a result, many plants suspended or reduced their growth and reproduction, which had major implications for agricultural crops such as corn. This response to environmental conditions is called __________.
a. dormancy b. hibernation c. niche tradeoffs d. both dormancy and niche tradeoffs
The larva in Figure 31-4 is:
A. a veliger.
B. a glochidium.
C. a trochophore.
D. a nauplius.
E. a pupa.
Complementary base pairs are held together by
A) disulfide bonds. B) peptide bonds. C) covalent bonds. D) hydrogen bonds. E) ionic bonds.