1. GAPs (GTPase activating proteins) act on G proteins toâ¦
A.
stimulate GTP hydrolysis, thereby turning the G protein âon.â
B.
stimulate GTP binding, thereby turning the G protein âoff.â
C.
stimulate GTP hydrolysis, thereby turning the G protein âoff.â
D.
stimulate GTP binding, thereby turning the G protein âon.â
QUESTION 2
1. Transautophosphorylation occurs on
A.
guanylyl cyclases
B.
receptor tyrosine kinases
C.
transmembrane scaffolds
D.
G protein-coupled receptors
QUESTION 3
1. Local mediators are ligands that are involved in
A.
paracrine signaling
B.
synaptic signaling
C.
contact-dependent signaling
D.
endocrine signaling
QUESTION 4
1. Which of these are NOT signal termination mechanisms?
A.
Release of ligand from its receptor
B.
G protein reformation (Gα + Gβγ = Gαβγ)
C.
G protein hydrolysis of GTP (G-GDP)
D.
Second messenger release
QUESTION 5
1. A lipid-soluble ligand would be expected to bind to a
A.
Second messenger
B.
transmembrane receptor
C.
G protein coupled receptor
D.
nuclear receptor
QUESTION 6
1. Which amino acid is NOT mainly phosphorylated by a protein kinase?
A.
threonine
B.
serine
C.
tyrosine
D.
lysine
1. GAPs (GTPase activating proteins) act on G proteins toâ¦
| A. | stimulate GTP hydrolysis, thereby turning the G protein âon.â | |
| B. | stimulate GTP binding, thereby turning the G protein âoff.â | |
| C. | stimulate GTP hydrolysis, thereby turning the G protein âoff.â | |
| D. | stimulate GTP binding, thereby turning the G protein âon.â |
QUESTION 2
1. Transautophosphorylation occurs on
| A. | guanylyl cyclases | |
| B. | receptor tyrosine kinases | |
| C. | transmembrane scaffolds | |
| D. | G protein-coupled receptors |
QUESTION 3
1. Local mediators are ligands that are involved in
| A. | paracrine signaling | |
| B. | synaptic signaling | |
| C. | contact-dependent signaling | |
| D. | endocrine signaling |
QUESTION 4
1. Which of these are NOT signal termination mechanisms?
| A. | Release of ligand from its receptor | |
| B. | G protein reformation (Gα + Gβγ = Gαβγ) | |
| C. | G protein hydrolysis of GTP (G-GDP) | |
| D. | Second messenger release |
QUESTION 5
1. A lipid-soluble ligand would be expected to bind to a
| A. | Second messenger | |
| B. | transmembrane receptor | |
| C. | G protein coupled receptor | |
| D. | nuclear receptor |
QUESTION 6
1. Which amino acid is NOT mainly phosphorylated by a protein kinase?
| A. | threonine | |
| B. | serine | |
| C. | tyrosine | |
| D. | lysine |
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Related questions
Cell biology Questions
1. Where is the sugar-phosphate backbone located in a DNA strand within the DNA double helix?
a) Alternates between outside and inside
b)Inside
c)Outside
d)Varies between purines and pyrimidines
e)Depends on the species
2) Which of these statements defines paracrine cell signaling?
| a) | A messenger molecule released into the blood stream to bind to a receptor on a cell far away from the release site. | ||||||||||||||||
| b) | A messenger molecule released by a cell into the extracellular space that binds to receptors on the surface of the same cell. | ||||||||||||||||
| c) | A messenger molecules released by a cell into the extracellular space that travels short distances to bind to a receptor in a nearby cell. | ||||||||||||||||
| d) | A messenger molecule release by a tissue into the lumen of an organ that diffuse to bind to receptors far away from the release site. | ||||||||||||||||
| e)All of the above. 3. Which effect has the binding of the ligand to a G-protein coupled receptor on intracellular G-protein?
|
1. Which cellular processes occur as a consequence of differential control of gene expression in eukaryotic cells?
| a) Cell Differentiation | ||||||||||||||||||||||||||||||||
| b) Differential Translation | ||||||||||||||||||||||||||||||||
| c) Differential Polymerization | ||||||||||||||||||||||||||||||||
| d) Differential DNA Replication | ||||||||||||||||||||||||||||||||
| e) Differential tRNA Degradation 2) Multicellular organisms are comprised of a variety of cells with different morphologies and different functions. Which is the underlying mechanism that leads to the generation of diverse cell in one organism?
|
4) Which effect has the binding of the ligand to a G-protein coupled receptor on intracellular G-protein?
| a) | ATP is hydrolyzed, activating phosphorylation | |
| b) | GTP is exchanged for GDP on the G protein, inactivating the G protein | |
| c) | GDP is exchanged for GTP on the G protein, activating the G protein | |
| d) | GMP is released from the G-protein, inactivating the receptor | |
| e) | None of the above |
