Traits that are determined by a single gene:
a. are common in humans.
b. occur in single-celled organisms, but not in humans.
c. must occur on the X chromosome because males have only a single X, so the gene must be able to function in the absence of its homologous allele. d. include eye color and skin color.
e. can have only two alleles.
Ans: a. are common in humans.
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Which of the following statements is TRUE of restriction enzymes?
A. they are not naturally produced by bacteria, but are bioengineered by humans. B. they protect bacterial cells from invasion by foreign DNA. C. they cut at random sites within a genome. D. they cleave DNA only at sites of adjacent thymine bases. E. there are less than 10 restriction enzymes known.
A function of
A. secretion of enzymes. B. transport of water and minerals. C. transport of complex carbohydrates. D. production of spores. E. formation of dikaryotes.
The sense of hearing in both invertebrates and
vertebrates is dependent on a. fluid displacement. b. hair bending. c. echolocation. d. vibration of a membrane. e. all of these.
When the body has excess sodium, which of the following does NOT happen?
a. more sodium is excreted b. more sodium is reabsorbed c. edema (swelling) occurs d. blood pressure rises e. aldosterone secretion is inhibited