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Biochemistry; Free Online Mock Test 19

Author: RxPG, Posted on Thursday, July 03 @ 00:00:00 IST by RxPG  

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Multiple Choice Test

1) The equilibrium constant in case of enzyme catalysed reaction :

One answer only.
a) Depends on enzyme concentration
b) Depends on substrate concentration
c) It is same regardless of whether the equilibrium is approached with or without enzyme catalysis
d) None of the above

2) Which of the following is uncorrect about Hexokinase enzyme

One answer only.
a) Km of enzyme is low, hence affinity for glucose is low
b) Its non specific enzyme can phosphorylate any of the nexoses
c) Not affected by presence of insulin
d) Allosterically inhibited by glucose

3) Biotin serves as a coenzyme for which of the following

One answer only.
a) Pyruvate carboxylase
b) Phosphocuol pyruvate carboxylase
c) Fructose 1 - 6 - biphosphatase
d) Propionyl CoA Carboxylase & pyruvate carboxylase

4) Acetyl CoA formed as a result of mitochondrial pyruvate dehydrogenase activity is transported to cytosol via impermeable mitochondrial membrane for fatty acid synthesis only in the form of

One answer only.
a) Ketone bodies
b) A cyl butyric acid
c) Citrate
d) As Acetyl CoA itself

5)  ketoglutarate require which of the following coenzymes (Vitamins ) for its optimum activity

One answer only.
a) Riboflavin
b) Niacin
c) Thiamine
d) All of the above

6) Number of ATP molecules generated via succinate dehydrogenase mediated energy reaction in citric acid cycle is

One answer only.
a) 3 ATP
b) 5 ATP
c) 2 ATP
d) 1 ATP

7) Antibiotic Antimycin A inhibit the respiratory chain reaction at the level of

One answer only.
a) Complex I , the point of entry into electron transport chain for electrons from NADH
b) Complex II , point of entry into electron transport chain for electrons from Succinate
c) Coenzyme Q , a lipid soluble electron donor to Complex III
d) Complex III, at the electron transfer from coenzyme Q to Cytochrome - C

8) Which of the following steps represents final pathway of electron transport and energy generation

One answer only.
a) FAD to Fe - S to Cyt b560
b) FMN to Fe - S to Coenz Q
c) Cyt b562 to Cyt b566 to Fe S to Cyt C1
d) Cu2+ to Cyt a to Cyt a3

9) Which of the following is oxidative phosphorylation uncouplers

One answer only.
a) 2, 4 Dinitrophenol
b) Dicumarol
c) Bilirubin
d) All of the above

10) Which of the following are substrates for Gluconeogenesis

One answer only.
a) Lactate
b) Glycerol
c) Alanine
d) All of the above

This test has been created by RxPG

RxPG AIIMS May 2003 book

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