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Answers bdbdc
1.
2. 1- For each characteristic signal listed below,
select the corresponding 2nd messenger .
1- 1,25 dihydroxy cholecalciferol
2- Atrial Natruretic peptide
3- Vasopressin.
4- Insulin.
a- Tyrosine kinase.
b- cGMP.
c- cAMP.
d- phosphatidyl inositol and ca++
e- Intracellular receptor that function in the
nucleus.
3. Hormone that bind to cell surface
receptor and require the second
messenger cAMP is
• a. Thyroid hormones
• b. Glucagon
• c. Calcitriol
• d. Retinol
4. The mechanism of action of glucagon
involves all of the following steps EXCEPT:-
• a- Interaction with a transmembrane segment
receptor.
• b- Activation of a Gs heterotrimeric protein.
• c- Activation of protein kinase.
• d- Activation of tyrosine kinase receptor.
5. The receptors for insulin is
a) dimeric
b) tetrameric
c) trimeric
d) monomeric
6. Glucagon hormone increases all the
following pathway EXCEPT:
A- Liver glycogenolysis.
B- Gluconeogenesis.
C- Lipolysis.
D- Liver glycogenesis.
7. α subunit in G-protein in its active state
is bound to:
A- CTP.
B- CDP.
C- GTP.
D- GDP.
