1.) Calmodulin is a(n): A) allosteric activator of calcium-dependent enzymes. B)
ID: 10584 • Letter: 1
Question
1.) Calmodulin is a(n):A) allosteric activator of calcium-dependent enzymes.
B) allosteric inhibitor of calcium-dependent enzymes.
C) calcium-dependent enzyme.
D) cell surface calcium receptor.
E) regulatory subunit of calcium-dependent enzymes.
2.) Which of the following statements concerning signal transduction by the insulin receptor is not correct?
A) Activation of the receptor protein kinase activity results in the activation of additional protein kinases.
B) Binding of insulin to the receptor activates a protein kinase.
C) Binding of insulin to the receptor results in a change in its quaternary structure.
D) The receptor protein kinase activity is specific for tyrosine residues on the substrate proteins.
E) The substrates of the receptor protein kinase activity are mainly proteins that regulate transcription.
3.)The specificity of signaling pathways includes all of the following except:
A) flippase-catalyzed movement of phospholipids from the inner to the outer leaflet.
B) migration of signal proteins into membrane rafts.
C) phosphorylation of target proteins at Ser, Thr, or Tyr residues.
D) the ability to be switched off instantly by hydrolysis of a single phosphate-ester bond.
E) the assembly of large multiprotein complexes
4.) The force that drives an ion through a membrane channel depends upon:
A) the charge on the membrane.
B) the difference in electrical potential across the membrane.
C) the size of the channel.
D) the size of the ion.
E) the size of the membrane.
Explanation / Answer
1.) Calmodulin is a(n):
A) allosteric activator of calcium-dependent enzymes.
B) allosteric inhibitor of calcium-dependent enzymes.
C) calcium-dependent enzyme.
D) cell surface calcium receptor.
E) regulatory subunit of calcium-dependent enzymes.
2.) Which of the following statements concerning signal transduction by the insulin receptor is not correct?
A) Activation of the receptor protein kinase activity results in the activation of additional protein kinases.
B) Binding of insulin to the receptor activates a protein kinase.
C) Binding of insulin to the receptor results in a change in its quaternary structure.
D) The receptor protein kinase activity is specific for tyrosine residues on the substrate proteins.
E) The substrates of the receptor protein kinase activity are mainly proteins that regulate transcription.
3.)The specificity of signaling pathways includes all of the following except:
A) flippase-catalyzed movement of phospholipids from the inner to the outer leaflet.
B) migration of signal proteins into membrane rafts.
C) phosphorylation of target proteins at Ser, Thr, or Tyr residues.
D) the ability to be switched off instantly by hydrolysis of a single phosphate-ester bond.
E) the assembly of large multiprotein complexes
4.) The force that drives an ion through a membrane channel depends upon:
A) the charge on the membrane.
B) the difference in electrical potential across the membrane.
C) the size of the channel.
D) the size of the ion.
E) the size of the membrane.
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