In an experiment examining adrenergic receptors, epinephrine alone was not able to trigger an increase in cAMP, but
when beta receptors were fused with animal cells, there were high levels of cAMP. This indicates ____ was occurring.
a. activation of epinephrine
b. protein kinase inhibition
c. activation of adenylyl cyclase only
d. protein kinase amplification only
e. both activation of adenylyl cyclase and protein kinase amplification
ANSWER: e
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Chromosomes of a pair of homologous chromosomes may differ from other chromosomes in terms of
a. size. b. shape. c. alleles they carry. d. position of the centromere. e. all of these.
Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) All of the above are probable reasons.
In scyphozoans, the ____ is the dominant body form
a. polyp b. hydra c. medusa d. larvae e. juvenile
Convert 1mL to liter.
A. 0.01 liter B. 100 liters C. 10 liters D. .001 liters