Substance E is made in the pancreas, travels through the blood, and binds to a surface receptor on a target cell. After
dimerization and autophosphorylation, the receptor activates a signaling protein. Substance E is therefore the ligand for
____.
a. a receptor tyrosine kinase
b. a G-protein-coupled receptor
c. a hormone receptor
d. a ligand-gated ion channel
e. guanylyl cyclase
ANSWER: a
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Atoms of a single element that possess different numbers of neutrons are called:
A. isomers. B. polymers. C. ions. D. isotopes. E. monomers.
Which of the following is not an advantage of uric acid excretion in terrestrial animals?
a. Uric acid can be excreted as a paste, thereby conserving water. b. Uric acid is not toxic and can be safely stored. c. Uric acid can be stored in the eggs of animals without harm to the embryos. d. Uric acid is soluble in water and can be easily excreted. e. Uric acid can be excreted along with feces in some animals.
On October 5, a pet store sold a kitten that subsequently died. On October 22, rabies was diagnosed in the kitten. Between September 19 and October 23, the pet store had sold 34 kittens. Approximately 1000 people responded to health care providers following local media alerts. These people were given
A) antibiotics. B) human diploid cell vaccine. C) immune globulin injections. D) antiviral medications. E) postexposure prophylaxis.
Reverse transcriptase synthesizes a DNA molecule from an RNA template.
Answer the following statement true (T) or false (F)