Biochemistry MCQs

Page No. 36

Key glycolytic enzymes_____________?


aPhosphofructokinase


bHexokinase


cPyruvate kinase


dGlucose 1,6 diphosphatase


View Answer Phosphofructokinase

Benzidine test is positive with the enzyme______________?


aCytochrome oxidase


bDehydrogenase


cHydrolase


dPeroxidase


View Answer Peroxidase

Dehydrogenase used as coenzymes all of the following, except________________?


aFMN


bFAD


cNADP+


dFerro protoporphyrin


View Answer Ferro protoporphyrin

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


aIt is present in cytoplasm


bCatalyzes the conversion of pyruvate to oxaloacetate


cRequires TPP as cofactor


dCatalyzes a reversible reaction



Competitive enzyme inhibition will cause_____________?


aDecrease of km and increase of Vmax


bincrease of km and increase of Vmax


cDecrease of km and decrease of Vmax


dIncrease of km and Unchanged of Vmax



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


aTransketaolase


bTransaldolase


cAlpha ketoglutarate dehydrogenase


dPyruvate dehydrogenase


View Answer Transketaolase

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


aTransketolase


bDehydrogenase


cOxidase


dCarboxylase


View Answer Carboxylase

Enzymes help by____________?


aLowering the activation energy


b Increasing the substrate concentration


cDecreasing the surface tension


dIncreasing the activation energy



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


a ATPase


bEnolase


cPyruvate Kinase


dFructose 6 phosphatase


View Answer Enolase

Muscle glycogen cannot contribute directly to blood glucose level because___________?


a Muscle lacks glucose 6 phosphatase


bMuscle lacks phospho gluco isomerase


cAbsence of glucokinase


dMuscle does not contain glycogen phosphorylase



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