Substance C is secreted from a neuron, and binds to its receptor on a nearby cell, triggering an increase in intracellular
cAMP. Substance C is therefore a ligand for a ____.
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: b
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The activity of the ribosome in translation is analogous to a(n) _____
a. assembly line b. dance c. planet racing around the sun d. foot race e. chess game
The pituitary hormone associated with metabolic rate
and with growth and development is a. ACTH. b. TSH. c. FSH. d. LH. e. GH.
Respond to statements 126–129 with reference to the four glands
or structures of the mammalian gastrointestinal tract listed below. a. salivary glands b. stomach mucosa c. intestinal mucosa d. pancreas M 126. The enzyme pepsin is produced there. M 127. The enzyme carboxypeptidase is produced there. D 128. The fat-digesting enzyme, lipase, is formed there. D 129. The peptide-digesting enzyme, aminopeptidase, is produced there.
A fish detects vibrations in the water by means of its ________, which contains numerous ________.
A. lateral line; thermoreceptors B. ear; statocysts C. skin; mechanoreceptors D. lateral line; hair cells E. swim bladder; stretch receptors