Avery and his coworkers showed that the agent responsible for changing nonvirulent bacteria into virulent bacteria was

A. polysaccharide.
B. RNA.
C. protein.
D. DNA.
E. lipid.


Answer: D

Biology & Microbiology

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The Precambrian supereon, in which life first appeared and diversified to multicellular eukaryotes, lasted approximately ___ of the geologic timescale.

A. 50% B. 30% C. 15% D. 85% E. None of the answer choices is correct.

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Which of the following is not correct about birds?

A. Their feathers are derived from reptilian scales. B. They have a low body temperature. C. They have large breast muscles. D. They have a fused collarbone. E. They have thin, hollow bones.

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Which of the following is/are hydrophilic?

A. cholesterol B. glucose C. vegetable oil D. Vegetable oil, butter, and cholesterol are correct. E. butter

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Which of the following is the best interpretation of the graph below of mussel size (X-axis) versus energy gain (line graph, left Y-axis), and number of mussels eaten per day (histogram, right Y-axis)?

A. Crabs tend to consume most of the largest mussels. B. Crabs select mussels in a way that maximizes their energy gain. C. Mussels are selected as food sources by crabs. D. Mussel size does not seem to be a good predictor as to which mussel hungry crabs will select. E. Crabs prefer the mussels with the smallest length for their food resources.

Biology & Microbiology