The region of an antibody molecule that recognizes and binds to an antigen is the
A. hinge region.
B. variable region.
C. constant region.
D. base of the antibody molecule.
E. heavy chain only.
B. variable region.
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The apical bud of a shoot produces ________, resulting in the inhibition of lateral bud growth
A) abscisic acid B) ethylene C) cytokinin D) gibberellin E) auxin
Answer the following statements true (T) or false (F)
1. The same neurotransmitter may produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds. 2. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 3. Ionotropic receptors act by activating G proteins in target cells. 4. Metabotropic receptors act by initiating changes in second messenger systems in target cells.
A human X-linked gene is
a. found only in males. b. more frequently expressed in females. c. found on the Y chromosome. d. transmitted from father to son. e. found on the X chromosome.
Which of the following is a primary structural constituent of the plant cell secondary wall?
A) hemicellulose B) extensin C) collagen D) pectin E) cellulose