A bottleneck may be dangerous to a population because:
A) the potential for natural selection is greatly increased.
B) genetic variability is diminished.
C) mutation rate is increased.
D) mutation rate is decreased.
Answer: B
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Which of the following is NOT a characteristic of most animals?
A. They have Hox genes. B. They are heterotrophic. C. They have an extracellular matrix of proteins such as collagen. D. They have cell walls. E. They have a nervous system.
Which of the following is NOT an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls the other way. d. A zebroid is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
Which of the following molecules has the most potential energy?
A. Pyruvate B. Acetyl CoA C. Glucose D. CO2
Different versions of a protein, which are known as ________, are adapted to function in different tissues or at different stages of development.
A) homologous B) families C) mutations D) isoforms E) subunits