Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A) They are formed in response to an encounter with an antigen.
B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter.
C) They are bound to the surface of B lymphocytes and have two antigen-binding sites.
D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR.
E) Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.
A
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a. zygote c. gastrula b. hermaphrodite d. gamete
In terms of classification, humans belong to which domain?
a. prokaryote b. Eukarya c. Archaea d. Bacteria e. protists
The retina is incomplete at the place where the ____ ____ leaves the eye forming your "blind spot"
Fill in the blank(s) with the appropriate word(s).optic nerve
Who played the most influential role in discovering the importance of the nucleus?
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