Biochemistry MCQs

Page No. 36

Key glycolytic enzymes_____________?


aPhosphofructokinase

✓


bHexokinase

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cPyruvate kinase

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dGlucose 1,6 diphosphatase

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View Answer Phosphofructokinase

Benzidine test is positive with the enzyme______________?


aCytochrome oxidase

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bDehydrogenase

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cHydrolase

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dPeroxidase

✓


View Answer Peroxidase

Dehydrogenase used as coenzymes all of the following, except________________?


aFMN

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bFAD

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cNADP+

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dFerro protoporphyrin

✓


View Answer Ferro protoporphyrin

Which of the following is correct of the pyruvate dehydrogenase enzyme complex ?


aIt is present in cytoplasm

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bCatalyzes the conversion of pyruvate to oxaloacetate

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cRequires TPP as cofactor

✓


dCatalyzes a reversible reaction

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Competitive enzyme inhibition will cause_____________?


aDecrease of km and increase of Vmax

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bincrease of km and increase of Vmax

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cDecrease of km and decrease of Vmax

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dIncrease of km and Unchanged of Vmax

✓



The deficiency of thiamine can be identified by measuring the red cell______________?


aTransketaolase

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bTransaldolase

✓


cAlpha ketoglutarate dehydrogenase

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dPyruvate dehydrogenase

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View Answer Transketaolase

The activity of the following enzyme is affected by biotin deficiency____________?


aTransketolase

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bDehydrogenase

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cOxidase

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dCarboxylase

✓


View Answer Carboxylase

Enzymes help by____________?


aLowering the activation energy

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b Increasing the substrate concentration

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cDecreasing the surface tension

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dIncreasing the activation energy

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The main site of fluoride inhibition in the Embden Meyerhof pathway of acid____________?


a ATPase

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bEnolase

✓


cPyruvate Kinase

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dFructose 6 phosphatase

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View Answer Enolase

Muscle glycogen cannot contribute directly to blood glucose level because___________?


a Muscle lacks glucose 6 phosphatase

✓


bMuscle lacks phospho gluco isomerase

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cAbsence of glucokinase

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dMuscle does not contain glycogen phosphorylase

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