Which statement best describes the relationship between an antibody and an antigen?
a. An antibody is specifically produced in response to an antigen.
b. An antibody is produced by T cells and an antigen is a foreign protein.
c. An antigen is presented by antigen presenting cells to plasma cells, which produce antibodies.
d. An antigen is a disease-causing organism, and antibodies are produced by B cells.
e. An antibody generally induces antigen formation.
a
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Nitrous oxide (N2O) is a
A) product of denitrification. B) product of nitrification. C) potent greenhouse gas. D) potent greenhouse gas that is a product of denitrification.
When does a species become classified as endangered?
a. when less than 100 remain b. when less than 500 remain c. when less than 1000 remain d. There are no definitive guidelines for classifying a species as endangered
Which of these processes is a reversal of the progression of the other three?
a. ingestion b. peristalsis c. emesis d. elimination
The above figure of goslings (baby geese)
following their mother demonstrates a. imprinting behavior. b. displaying instinctive behavior. c. feeding a social parasite. d. a learned behavior. e. all of these