Most of the exchange surfaces of multicellular animals are lined with _____
A) connective tissue
B) smooth muscle cells
C) neural tissue
D) epithelial tissue
E) adipose tissue
Answer: D
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Okazaki fragments do which of the following?
A. Assist in forming the replication fork B. Bind to the oriC region C. Assist in the synthesis of DNA from the lagging strand D. Reform the double-helix following replication E. None of the answers are correct
The stable presence of two or more phenotypes in a population is called a ____
a. balanced polymorphism b. mixed gene pool c. mutation pressure d. population bottleneck e. competitive advantage
Since 1980, the proportion of adults in the United States who are obese has ____
a. decreased by half b. doubled c. tripled d. decreased dramatically e. stayed the same
Within six months of effectively using methicillin to treat S. aureus infections in a community, all new infections were caused by MRSA. How can this result best be explained?
A. The drug caused the S. aureus DNA to change. B. Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency. C. In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug. D. A patient must have become infected with MRSA from another community. E. S. aureus can resist vaccines.