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Within six months of effectively using methicillin to treat S. aureus infections in a community, all newS.aureus infections were caused by MRSA. How can this best be explained?a. A patient must have become infected with MRSA from another community.b. In response to the drug, S. aureus invented and produced drug-resistant proteins targeted by the drug.c. Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.d. S. aureus evolved to resist vaccines.

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The word "Aztlan" meansa. "the place of the seven legendary caves."b. "the great feathered-serpent."c. "the hungry ghosts."d. "the warrior god"e. "the sun god."

A nonapeptide was determined to have the following amino acid composition: (Lys)2, (Gly) 2, (Phe) 2, His, Leu, Met. The native peptide was incubated with 1-fluoro-2,4-dinitrobenzene (FDNB) and then hydrolyzed; 2,4-dinitrophenylhistidine was identified by HPLC. When the native peptide was exposed to cyanogen bromide (CNBr), an octapeptide and free glycine were recovered. Incubation of the native peptide with trypsin gave a pentapeptide, a tripeptide, and free Lys. 2,4-Dinitrophenyl-histidine was recovered from the pentapeptide, and 2,4-dinitrophenylphenylalanine was recovered from the tripeptide. Digestion with the enzyme pepsin produced a dipeptide, a tripeptide, and a tetrapeptide. The tetrapeptide was composed of (Lys) 2, Phe, and Gly. The native sequence was determined to be:

Which of the following describes the overall three-dimensional folding of a polypeptide?

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