GAPs (GTPase activating proteins), biology assignment help
1.GAPs (GTPase activating proteins) act on G proteins to…
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A. |
stimulate GTP hydrolysis, thereby turning the G protein “on.” |
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B. |
stimulate GTP binding, thereby turning the G protein “off.” |
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C. |
stimulate GTP hydrolysis, thereby turning the G protein “off.” |
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D. |
stimulate GTP binding, thereby turning the G protein “on.” |
QUESTION 2
1.Transautophosphorylation occurs on
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A. |
guanylyl cyclases |
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B. |
receptor tyrosine kinases |
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C. |
transmembrane scaffolds |
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D. |
G protein-coupled receptors |
QUESTION 3
1.Local mediators are ligands that are involved in
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A. |
paracrine signaling |
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B. |
synaptic signaling |
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C. |
contact-dependent signaling |
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D. |
endocrine signaling |
QUESTION 4
1.Which of these are NOT signal termination mechanisms?
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A. |
Release of ligand from its receptor |
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B. |
G protein reformation (Gα + Gβγ = Gαβγ) |
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C. |
G protein hydrolysis of GTP (G-GDP) |
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D. |
Second messenger release |
QUESTION 5
1.A lipid-soluble ligand would be expected to bind to a
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A. |
Second messenger |
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B. |
transmembrane receptor |
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C. |
G protein coupled receptor |
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D. |
nuclear receptor |
QUESTION 6
1.Which amino acid is NOT mainly phosphorylated by a protein kinase?
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A. |
threonine |
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B. |
serine |
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C. |
tyrosine |
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D. |
lysine |
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