Darwin's exposure to Lyell gave him insight on the ____.
A. existing evidence from fossils
B. record of catastrophic changes that encouraged evolution
C. soundness of Lamarck’s theories
D. enormous lengths of time required for geologic events
E. arguments for creationism
Answer: D
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How is the central portion of a T cell receptor complex functionally analogous to the center of the B cell receptor complex?
A. It has two pieces (chains), just like a B-cell receptor. B. Both receptors bind epitopes (small amino acid sections of antigen molecules). C. Both bind structures directly on the surface of microbes. D. Both can be secreted from lymphocytes to bind to pathogens under certain situations.
Drugs that target peptidoglycan do not affect eukaryotes
Indicate whether this statement is true or false.
Broad, flat molars and reduced canines characterize the teeth of ____
a. cows b. cats c. wolves d. humans e. apes
Four of the five factors listed below affect population
size. Select the exception. a. births b. distribution c. emigration d. immigration e. deaths