How are B-cell receptors different from T-cell receptors?
a. B-cell receptors bind antigen, while T-cell receptors do not.
b. B-cell receptors have a more complex structure.
c. B-cell receptors have a more simple structure.
d. B-cell receptors are bound to the cell membrane, while T-cell receptors are bound to the
nuclear membrane.
e. B-cell receptors stimulate the production of a clone of cells.
B
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Within a cell, the amount of protein made using a given mRNA molecule depends partly on _____
A) the degree of DNA methylation B) the rate at which the mRNA is degraded C) the presence of certain transcription factors D) the number of introns present in the mRNA E) the types of ribosomes present in the cytoplasm
In which tissue would you look for cells that function in point-to-point communication?
(a) connective. (b) epithelial. (c) muscle. (d) nervous
Which of the following acronyms describes a technique used in chromosome painting?
A. RFLP B. VNTR C. STR D. FISH E. STS
n enzyme produced in response to the presence of a substrate is called
A) A promoter. B) A restriction enzyme. C) An operator. D) A repressible enzyme. E) An inducible enzyme.