The best definition of antigen is

A) Something foreign in the body.
B) A chemical that elicits an antibody response and can combine with these antibodies.
C) A chemical that combines with antibodies.
D) A pathogen.
E) A protein that combines with antibodies.


Ans: B) A chemical that elicits an antibody response and can combine with these antibodies.

Biology & Microbiology

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All of the populations of different species that occupy and are adapted to a given area are known as ____.

A. the biosphere B. a community C. an ecosystem D. a niche E. the habitat

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Which tissue type will move the body? a. Muscle b. Nerve c. All of these choices

d. Epithelial e. Connective

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The study of the observable is

a. science. b. optics. c. hypothesis. d. critical thinking. e. visualization.

Biology & Microbiology