Enzymes MCQs

Option A: Pyruvate carboxylase

Option B: Lactate dehydrogenase

Option C: Succinate thiokinase

Option D: Phosphohexose isomerase

Correct Answer: Pyruvate carboxylase ✔

Option A: Zellweger’s syndrome

Option B: Gaucher’s disease

Option C: Epidermolysis bullosa

Option D: Leber’s neuropathy

Correct Answer: A. Zellweger’s syndrome ✔

Option A: Apo A-II

Option B: Apo C-II

Option C: Apo C-III

Option D: Apo B-II

Correct Answer: Apo C-II ✔

Option A: Apoenzymes

Option B: Coenzymes

Option C: Proenzymes

Option D: Holoenzymes

Correct Answer: Proenzymes ✔

Option A: Myoglobin

Option B: Cytochrome

Option C: Catalase

Option D: Pyruvate kinase

Correct Answer: Pyruvate kinase ✔

Option A: Alkaline phosphatase

Option B: SGOT

Option C: SGPT

Option D: CPK

Correct Answer: CPK ✔

Option A: Isozyme

Option B: Coenzyme

Option C: Antienzyme

Option D: Zymogen

Correct Answer: Isozyme ✔

Option A: Apoenzyme

Option B: Coenzyme

Option C: Holoenzyme

Option D: Constitutive enzyme

Correct Answer: Holoenzyme ✔

Option A: Tyrosine kinase

Option B: Polymerase

Option C: ATP synthase

Option D: Adenylate cyclase

Correct Answer: Adenylate cyclase ✔

Option A: Glutamine synthetase

Option B: Fumarase

Option C: Cholinesterase

Option D: Amylase

Correct Answer: Fumarase ✔

Option A: DNA polymerase

Option B: RNA polymerase

Option C: Reverse transcriptase

Option D: Phospho kinase

Correct Answer: Reverse transcriptase ✔

Option A: Pro enzyme

Option B: Iso enzyme

Option C: Co-enzyme

Option D: Holoenzyme

Correct Answer: Iso enzyme ✔

Option A: CPK

Option B: LDH

Option C: SGOT

Option D: Amylase

Correct Answer: CPK ✔

Option A: Cholinesterase

Option B: Anticholinesterases

Option C: Catechol 0-transferase

Option D: Oxidases

Correct Answer: Catechol 0-transferase ✔

Option A: Muscle lacks glucose 6 phosphatase

Option B: Muscle lacks phospho gluco isomerase

Option C: Absence of glucokinase

Option D: Muscle does not contain glycogen phosphorylase

Correct Answer: Muscle lacks glucose 6 phosphatase ✔

Option A: ATPase

Option B: Enolase

Option C: Pyruvate Kinase

Option D: Fructose 6 phosphatase

Correct Answer: Enolase ✔

Option A: Lowering the activation energy

Option B: Increasing the substrate concentration

Option C: Decreasing the surface tension

Option D: Increasing the activation energy

Correct Answer: Lowering the activation energy ✔

Option A: Transketolase

Option B: Dehydrogenase

Option C: Oxidase

Option D: Carboxylase

Correct Answer: Carboxylase ✔

Option A: Transketaolase

Option B: Transaldolase

Option C: Alpha ketoglutarate dehydrogenase

Option D: Pyruvate dehydrogenase

Correct Answer: Transketaolase ✔

Option A: Decrease of km and increase of Vmax

Option B: increase of km and increase of Vmax

Option C: Decrease of km and decrease of Vmax

Option D: Increase of km and Unchanged of Vmax

Correct Answer: Increase of km and Unchanged of Vmax ✔

Option A: It is present in cytoplasm

Option B: Catalyzes the conversion of pyruvate to oxaloacetate

Option C: Requires TPP as cofactor

Option D: Catalyzes a reversible reaction

Correct Answer: Requires TPP as cofactor ✔

Option A: FMN

Option B: FAD

Option C: NADP+

Option D: Ferro protoporphyrin

Correct Answer: Ferro protoporphyrin ✔

Option A: Cytochrome oxidase

Option B: Dehydrogenase

Option C: Hydrolase

Option D: Peroxidase

Correct Answer: Peroxidase ✔

Option A: Phosphofructokinase

Option B: Hexokinase

Option C: Pyruvate kinase

Option D: Glucose 1,6 diphosphatase

Correct Answer: Phosphofructokinase ✔

Option A: Fatty acid synthetase

Option B: Malonyl CoA carboxylase

Option C: Carbomoyl Phosphate synthetase

Option D: Adenosine phospho ribosyl transferase

Correct Answer: Fatty acid synthetase ✔

Option A: They are multienzyme complex

Option B: Follow Michaelis-Menton Kinetics

Option C: Presence of Modulator site

Option D: Give sigmoid shaped curve

Correct Answer: Follow Michaelis-Menton Kinetics ✔

Option A: Catalase

Option B: Tocopherol

Option C: Superoxide dismutase

Option D: Urate

Correct Answer: Catalase ✔

Option A: 5

Option B: 3

Option C: 11

Option D: 2

Correct Answer: 5 ✔

Option A: Nyctalopia

Option B: Xerophthalmia

Option C: Bitot’s spot

Option D: Keratomalacia

Correct Answer: Nyctalopia ✔

Option A: Cyclic AMP

Option B: Adenosine tri phosphate

Option C: Citrate

Option D: Fructose 2,6 bis phosphate

Correct Answer: Fructose 2,6 bis phosphate ✔

Option A: Phosphatase

Option B: Aldolase

Option C: Dismutase

Option D: ATPase

Correct Answer: ATPase ✔

Option A: Cofactor

Option B: Coenzyme

Option C: Apoenzyme

Option D: Holoenzyme

Correct Answer: Cofactor ✔

Option A: Activate the substrate

Option B: Increase the active sites of apoenzyme

Option C: Enhance the specificity of apoenzyme

Option D: Accept one of the cleavage products

Correct Answer: Accept one of the cleavage products ✔

Option A: Glucose 6 phosphate dehydrogenase

Option B: Glucose 6 phosphatase

Option C: Hexokinase

Option D: Glucose 1,6 diphosphatase

Correct Answer: Glucose 6 phosphate dehydrogenase ✔

Option A: Nucleus

Option B: Mitochondria

Option C: Ribosomes

Option D: Non-particulate cytoplasm

Correct Answer: Mitochondria ✔

Option A: Hypothyroidism

Option B: Carcinoma of prostate

Option C: Hyperparathyroidism

Option D: Myocardial infarction

Correct Answer: Hyperparathyroidism ✔

Option A: Cytochromes

Option B: Cytochrome P 450

Option C: Super oxide dismutase

Option D: Catalase

Correct Answer: Catalase ✔

Option A: Oxidases

Option B: Peptidases

Option C: Transferases

Option D: LIpases

Correct Answer: Transferases ✔

Option A: Lecithin cholesterol acyl transferase (LCAT)

Option B: Pyrophospho mevalonate decarboxylase

Option C: HMG CoA reductase

Option D: Phospho mevalonate kinase

Correct Answer: Lecithin cholesterol acyl transferase (LCAT) ✔

Option A: Action on substrate

Option B: Action of coenzymes

Option C: Nature of the enzymes

Option D: All of the above

Correct Answer: Action on substrate ✔

Option A: MM fraction

Option B: MB fraction

Option C: BB fraction

Option D: Both MM and BB fraction

Correct Answer: MB fraction ✔

Option A: A solvent

Option B: A base

Option C: A catalyst

Option D: Thermoplastic

Correct Answer: A catalyst ✔

Option A: Dissociation constant

Option B: The normal physiological substrate concentration

Option C: Substrate concentration at half maximal velocity

Option D: Numerically identical for all isozymes that catalyses a given reaction

Correct Answer: Substrate concentration at half maximal velocity ✔

Option A: HMG-Co A synthase

Option B: Malic enzyme

Option C: Malonyl CoA synthetase

Option D: Fatty acid synthetase

Correct Answer: Malic enzyme ✔

Option A: Glutamate oxaloacetate transaminase

Option B: Glutamate pyruvate transaminase

Option C: Alkaline phosphaase

Option D: Acid phosphatase

Correct Answer: Alkaline phosphaase ✔

Option A: Deficiency of glutamic acid

Option B: Deficiency of oxaloacetic acid

Option C: Liver disease

Option D: All of the above

Correct Answer: Liver disease ✔

Option A: Phosphoglutamase

Option B: Branching enzyme

Option C: Debranching enzyme

Option D: Glucose-6-phosphotase

Correct Answer: Glucose-6-phosphotase ✔

Option A: Rate of enzymatic reaction is independent of substrate concentration

Option B: Rate of non enzymatic reaction is proportional to substrate concentration

Option C: Km is the enzyme substrate complex association constant

Option D: Enzyme- substrate complex formation is essential in enzymatic reaction

Correct Answer: Enzyme- substrate complex formation is essential in enzymatic reaction ✔

Option A: Acetyl co enzyme A

Option B: Biotin

Option C: THF4

Option D: Pyridoxine

Correct Answer: THF4 ✔

1. Transferase
2. Reductase
3. Oxidoreductase
4. Oxidase

Correct Answer: 1. Transferase ✔

Option A: Apoenzyme

Option B: Proenzyme

Option C: Protoenzyme

Option D: Holoenzyme

Correct Answer: Holoenzyme ✔