The unique antigen-reactive proteins of T cells are
A) antibodies.
B) immunoglobins.
C) T cell receptors.
D) None of these is correct.
Answer: C
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What are some challenges land plants face compared to life in the water?
A. Obtaining resources from the air and soil instead of from water B. Obtaining and retaining moisture C. Staying upright against the pull of gravity D. All of the above are challenges faced by land plants.
Cork
A. helps transport nutrients and fluid. B. Both represent the major dermal tissue in bark and serves a protective function. C. Both represent the major dermal tissue in bark and helps transport nutrients and fluid. D. represents the major dermal tissue in bark. E. serves a protective function.
What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease is virtually absent in one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism is virtually absent in another?
a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ among different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. The alleles are fixed in these populations.
To maintain a constant pH, buffers act to either accept or release H+
Indicate whether the statement is true or false