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
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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.
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.
Which of the following is/are hydrophilic?
A. cholesterol B. glucose C. vegetable oil D. Vegetable oil, butter, and cholesterol are correct. E. butter
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.