The amino acid sequences in cytochrome c were determined for chickens, ducks, and humans. Scientists found a difference of 3 amino acids between chickens and ducks, and 13 differences between chickens and humans. Based on this information, one can conclude that
A. chickens are more closely related to ducks than they are to humans.
B. chickens are more closely related to humans than they are ducks.
C. ducks are more closely related to humans than they are to chickens.
D. chickens are as closely related to humans as they are to ducks.
Answer: A
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Which of the following can be used to carry foreign DNA into host cells? Choose all correct answers
a. RNA b. viruses c. PCR d. plasmids e. lipid clusters f. blasts of pellets g. xenotransplantation h. sequencing
In which one of the following would one expect to find motor units made up of only a few muscle cells?
A) arm muscles B) eye muscles C) chest muscles D) thigh muscles E) lower-leg muscles
What is the advantage of excreting nitrogenous waste in the form of ammonia?
A) Ammonia is less toxic than uric acid. B) Ammonia is less soluble than uric acid. C) Ammonia excretion conserves energy. D) Ammonia does not diffuse across cell membranes.
The amniotic egg evolved as an adaptation
A. to prevent desiccation. B. to permit the embryo to develop undisturbed up to the time of hatching. C. to insure survival in the uterus. D. against predation.