Biochemistry Questions and Answers – Receptor Enzymes

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Receptor Enzymes”.

1. SH₂ domain specifically binds to _____________
a) GDP
b) Ca⁺²
c) Phosphorylated tyrosine residues
d) Phosphorylated serine residues
View Answer

2. cAMP and cGMP are derived from ____________
a) ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively
b) ATP and GTP by the actions of adenylate cyclase and gualnlate cyclase respectively
c) GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively
d) None of the mentioned
View Answer

3. Which of the following is false about phosphorylation by IRS on serine residue?
a) It is an inhibitory phosphorylation
b) It is molecular mechanism for insulin resistance
c) It increases insulin levels
d) Target tissues fail to respond to circulating insulin
View Answer

4. The enzyme activated by cyclic AMP, passing on the hormonal signal is ____________
a) Protein kinase B
b) Protein kinase A
c) Protein kinase C
d) G protein receptor kinase
View Answer

5. Protein kinase ERK is activated by phosphorylation of ____________
a) Only Thr
b) Only Tyr
c) Both Thr and Tyr
d) Only Ser
View Answer

6. Activation of guanylyl cyclase produces ____________
a) Guanosine 3’, 5’-cyclic monophosphate
b) Guanosine 2’, 5’-cyclic monophosphate
c) Guanosine 4’, 5’-cyclic monophosphate
d) Guanosine 1’, 5’-cyclic monophosphate
View Answer

7. cGMP-dependent protein kinase is also called ____________
a) Protein kinase B
b) Protein kinase A
c) Protein kinase G
d) Protein kinase C
View Answer

8. Which of the following is not responsible of producing diarrhea?
a) Elevation in [cGMP]
b) Increase in Cl^– secretion
c) Decrease in reabsorption of water by the intestinal epithelium
d) Decrease in Cl^– secretion
View Answer

9. Which of the following is a short-lived messenger that acts by stimulating a soluble guanylyl cyclase, raising [cGMP] and stimulating PKG?
a) NO
b) NO₂
c) NO₃^–
d) N₂O
View Answer

10. Ras protein is a ____________
a) G-protein switch
b) Small monomeric GTPase switch protein
c) Serine-threonine kinase
d) Tyrosine kinase
View Answer

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.