#Question id: 1137
#Unit 4. Cell Communication and Cell Signaling
A loss-of-function mutation in PTEN phosphatase results in
a. increased cell proliferation.
b. decreased cell proliferation.
c. increased apoptosis.
d. decreased apoptosis.
#Question id: 1138
#Unit 4. Cell Communication and Cell Signaling
A loss-of-function mutation in Wnt would have a phenotype similar to a
a. gain-of-function mutation in GSK-3.
b. gain-of-function mutation in β-catenin.
c. loss-of-function mutation in GSK-3.
d. loss-of-function mutation in β-catenin.
#Question id: 1139
#Unit 4. Cell Communication and Cell Signaling
In paracrine signaling, the signaling molecule:
#Question id: 1140
#Unit 4. Cell Communication and Cell Signaling
Cell sensitivity to an external signal is determined by:
#Question id: 1141
#Unit 4. Cell Communication and Cell Signaling
If [R] = the free receptor concentration and [L] = the free ligand concentration, Kd is:
#Question id: 1142
#Unit 4. Cell Communication and Cell Signaling
Of the components of a heterotrimeric G protein, which subunit(s) is(are) able to activate downstream responses?