T cells will begin to secrete cytokines when
bound to which of the following?
a. a MHC-antigen complex
b. a receptor-antigen complex
c. an antigen directly bound to the surface of a
transport vesicle
d. an antigen directly bound to the surface of a
macrophage only
e. another T cell only
A
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a) females are better looking. b) males, on average, have higher fitness. c) females have a higher parental investment. d) males are choosy. e) males are more aggressive.
Explain why a food web gives a better picture of a community than does a food chain
What will be an ideal response?
Quaking aspen reproduces vegetatively by
a. root suckers. b. corms. c. bulbs. d. tubers. e. rhizomes
During an allergic reaction, IgE antibodies bind to ____
a. B cells b. T cells c. plasma cells d. mast cells e. neutrophils