Biochemistry MCQs

Page No. 34

Acetyl Co-A acts as a substrate for all the enzymes except______________?


aHMG-Co A synthase

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bMalic enzyme

✓


cMalonyl CoA synthetase

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dFatty acid synthetase

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View Answer Malic enzyme

Km of an enzyme is_____________?


aDissociation constant

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bThe normal physiological substrate concentration

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cSubstrate concentration at half maximal velocity

✓


dNumerically identical for all isozymes that catalyses a given reaction

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A material that speeds up a chemical reaction without chemically becoming involved is called_____________?


aA solvent

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bA base

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cA catalyst

✓


dThermoplastic

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View Answer A catalyst

Fraction of CPK is an enzyme that is elevated in a myocardial infarct is____________________?


aMM fraction

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bMB fraction

✓


cBB fraction

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dBoth MM and BB fraction

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View Answer MB fraction

Enzymes are classified according to_________________?


aAction on substrate

✓


bAction of coenzymes

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cNature of the enzymes

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dAll of the above

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View Answer Action on substrate

The activity of this plasma enzyme is responsible virtually for all plasma cholesterol esters in humans_______________?


a Lecithin cholesterol acyl transferase (LCAT)

✓


bPyrophospho mevalonate decarboxylase

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cHMG CoA reductase

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dPhospho mevalonate kinase

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Enzyme that catalyses the transfer of a molecule group from one molecule to another is_____________?


a Oxidases

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bPeptidases

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cTransferases

✓


dLIpases

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View Answer Transferases

The enzyme that splits hydrogen peroxide into water and oxygen is_____________?


aCytochromes

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bCytochrome P 450

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cSuper oxide dismutase

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dCatalase

✓


View Answer Catalase

Serum alkaline phosphatase level increase in_______________?


aHypothyroidism

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bCarcinoma of prostate

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cHyperparathyroidism

✓


dMyocardial infarction

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View Answer Hyperparathyroidism

Enzymes concerned with the citric acid cycle are found in______________?


aNucleus

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bMitochondria

✓


cRibosomes

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dNon-particulate cytoplasm

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View Answer Mitochondria

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