Members of the class Bivalvia:A
have gills that secrete the shell.
B. have a mantle that may form pearls.
C. are all sessile.
D. all have a radula.
E. have a broad foot used for locomotion.
B
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Natural selection that increases the frequency of a favorable allele is called _____
A. positive selection B. balancing selection C. sexual selection
A high school student in Nepal is accepted—and eventually attends—college in the United States. His diet goes from one that is rich in vegetables and grains to one that primarily consists of meat and sugars
What will happen to the bacterial composition of his intestines? A. There will be more Firmicutes inhabiting his intestinal tract. B. There will be more Bacteroidetes inhabiting his intestinal tract. C. Nothing will happen; there is no relationship between bacteria in the intestines and diet. D. Bacteria will no longer inhabit his intestines.
A gram of elephant tissue has a higher resting metabolic rate than a gram of mouse tissue
A. true B. false
Which of the following statements is NOT a defining characteristic of adaptive immunity?
A. Self/nonself recognition B. Tailored to specific antigens C. Ability to produce diverse antigen receptors D. Memory allows a fast and strong secondary response E. Fast-acting initial response mediated by complement