#Question id: 1127
#XL - Q Biochemistry
Which of the following steps does not occur after acetylcholine binds to the muscarinic acetylcholine receptor in heart muscle cells?
#Question id: 1133
#XL - Q Biochemistry
What tertiary structure characterizes all cytokines?
#Question id: 1135
#XL - Q Biochemistry
Which of the following is a direct substrate of MAP kinase?
a. TCF b. SRF c. SRE d. p90RSK e. CREB
#Question id: 1175
#XL - T Zoology
Which of the following mechanisms is NOT used to terminate cytokine signaling and the JAK/STAT pathway?
#Question id: 1225
#XL - Q Biochemistry
The dissociation constant Kd for a receptor-ligand complex is
a. a measure of the affinity of the receptor for the ligand.
b. the concentration of the ligand at which half of the receptors contain bound ligand.
c. a measure of the time it takes for a ligand to be converted to a product.
d. equal to koff/kon
#Question id: 1246
#XL - Q Biochemistry
An SH2-containing protein contains a mutation that changes its binding pocket such that tyrosine and phosphotyrosine bind with equal affinity. As a result, MEK activity: