Many scientists believe that the evolution of multigene families, such as the genes for hemoglobin, is a result of which type of genetic rearrangement?
A) Duplication
B) Deletion
C) Inversion
D) Reciprocal translocation
E) Nonreciprocal translocation
A
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Two solutions of differing glucose concentration are placed in a container separated by a selectively permeable
membrane that restricts large molecules like glucose, but allows the free diffusion of water. What will be the glucose concentration in the container after dynamic equilibrium has been reached?
a. The water molecules will be evenly distributed in the container, with more glucose molecules on one side than the other. b. The volumes of the solution will be different, with a higher volume on the side that originally contained the higher concentration of glucose. c. The volumes of the solution will be different, with a lower volume on the side that originally contained the higher concentration of glucose. d. The glucose concentration of the two solutions will be identical on both sides of the membrane, but the volumes will remain unchanged. e. The volume and concentrations will be unchanged on both sides of the membrane.
The cells of reef-building corals are inhabited by symbiotic species of
A) algae. B) fungi. C) bacteria. D) cyanobacteria.
Sequence A in Figure 1-1 represents:
a. a hypothesis.
b. the experimental group.
c. the control group.
d. a sampling error.
e. a deduction.
Which of these characteristics is NOT found (or only rarely found) in the amphibians but is developed in reptiles?
a) aquatic larvae b) eggs with gelatinous covering c) internal fertilization d) thin, moist skin e) small, inefficient lungs