A paracrine signal that relaxes smooth muscle cells is
A) nitric oxide.
B) vitamin D.
C) testosterone.
D) cortisol.
E) antidiuretic hormone
Answer: A) nitric oxide.
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The first amino acid in a growing polypeptide chain is _____
a. methionine b. valine c. lysine d. phenylalanine e. glycine
Veins carry ________.
A. blood high in carbon dioxide B. blood low in oxygen and high in carbon dioxide C. blood high in oxygen D. blood low in oxygen
Which test uses radioactive isotopes to label antibodies or antigens in order to detect minute amounts of corresponding antigen or antibody?
A. Radioimmunoassay (RIA) B. Ouchterlony double diffusion C. Immunelectrophoresis D. Quellung test E. Western blot
The hormone that triggers insect metamorphosis from larva to adult is
a. ecdysone. b. aldosterone. c. retinoic acid. d. epidermal growth factor (EGF).