Enzymes ( Biochemistry ) MCQs – Competitive Medical MCQs
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Latest Enzymes ( Biochemistry ) Mcqs
The most occurred mcqs of Enzymes ( Biochemistry ) in past papers. Past papers of Enzymes ( Biochemistry ) Mcqs. Past papers of Enzymes ( Biochemistry ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Enzymes ( Biochemistry ) Mcqs. The Important series of Enzymes ( Biochemistry ) Mcqs are given below:
Biotin is required for the activity of_____________?
A. Pyruvate carboxylase
B. Succinate thiokinase
C. Lactate dehydrogenase
D. Phosphohexose isomerase
Mutation in the oxidative enzymes (peroxisomes) could lead to_______________?
A. Zellweger’s syndrome
B. Epidermolysis bullosa
C. Gaucher’s disease
D. Leber’s neuropathy
Cofactor required for lipoprotein lipase activity is_______________?
A. Apo C-III
B. Apo C-II
C. Apo A-II
D. Apo B-II
Inactive precursors of enzymes are known as_______________?
A. Coenzymes
B. Apoenzymes
C. Proenzymes
D. Holoenzymes
Iron is present in all of the following except_______________?
A. Cytochrome
B. Myoglobin
C. Catalase
D. Pyruvate kinase
Enzymes stored in muscle is________________?
A. SGOT
B. Alkaline phosphatase
C. SGPT
D. CPK
Lactate dehydrogenase is____________?
A. Isozyme
B. Antienzyme
C. Coenzyme
D. Zymogen
The combination of main supporting enzyme is called______________?
A. Coenzyme
B. Apoenzyme
C. Holoenzyme
D. Constitutive enzyme
Which of the following is a membrane bound enzyme that catalyzes the formation of cyclic AMP from ATP ?
A. Polymerase
B. Tyrosine kinase
C. ATP synthase
D. Adenylate cyclase
An example of layses is_____________?
A. Cholinesterase
B. Fumarase
C. Glutamine synthetase
D. Amylase
An enzyme that makes a double stranded DNA copy from a single stranded RNA template molecule is known as____________?
A. RNA polymerase
B. DNA polymerase
C. Reverse transcriptase
D. Phospho kinase
Vitamins MCQs
The enzymes that catalyses the same reaction but differ in physical properties are called as_____________?
A. Co-enzyme
B. Iso enzyme
C. Pro enzyme
D. Holoenzyme
In mycocarrdial infarction the first enzyme to rise____________?
A. CPK
B. SGOT
C. LDH
D. Amylase
Enzymes involved in degradation of epinephrine_____________?
A. Anticholinesterases
B. Cholinesterase
C. Catechol 0-transferase
D. Oxidases
Muscle glycogen cannot contribute directly to blood glucose level because___________?
A. Muscle lacks glucose 6 phosphatase
B. Absence of glucokinase
C. Muscle lacks phospho gluco isomerase
D. Muscle does not contain glycogen phosphorylase
The main site of fluoride inhibition in the Embden Meyerhof pathway of acid____________?
A. Pyruvate Kinase
B. Enolase
C. ATPase
D. Fructose 6 phosphatase
Enzymes help by____________?
A. Lowering the activation energy
B. Decreasing the surface tension
C. Increasing the substrate concentration
D. Increasing the activation energy
The activity of the following enzyme is affected by biotin deficiency____________?
A. Dehydrogenase
B. Transketolase
C. Oxidase
D. Carboxylase
The deficiency of thiamine can be identified by measuring the red cell______________?
A. Transketaolase
B. Alpha ketoglutarate dehydrogenase
C. Transaldolase
D. Pyruvate dehydrogenase
Competitive enzyme inhibition will cause_____________?
A. increase of km and increase of Vmax
B. Decrease of km and increase of Vmax
C. Decrease of km and decrease of Vmax
D. Increase of km and Unchanged of Vmax
Which of the following is correct of the pyruvate dehydrogenase enzyme complex ?
A. Catalyzes the conversion of pyruvate to oxaloacetate
B. It is present in cytoplasm
C. Requires TPP as cofactor
D. Catalyzes a reversible reaction
Dehydrogenase used as coenzymes all of the following, except________________?
A. FAD
B. FMN
C. NADP+
D. Ferro protoporphyrin
Benzidine test is positive with the enzyme______________?
A. Dehydrogenase
B. Cytochrome oxidase
C. Hydrolase
D. Peroxidase
Key glycolytic enzymes_____________?
A. Phosphofructokinase
B. Pyruvate kinase
C. Hexokinase
D. Glucose 1,6 diphosphatase
Lipid Metabolism MCQs
Multiienzyme complex in human_______________?
A. Fatty acid synthetase
B. Carbomoyl Phosphate synthetase
C. Malonyl CoA carboxylase
D. Adenosine phospho ribosyl transferase
Which of the following is NOT a characteristic feature of allosteric enzymes ?
A. Presence of Modulator site
B. Follow Michaelis-Menton Kinetics
C. They are multienzyme complex
D. Give sigmoid shaped curve
A example of a preventive antioxidant is_______________?
A. Catalase
B. Superoxide dismutase
C. Tocopherol
D. Urate
LDH has following number oflsoenzymes________________?
A. 5
B. 11
C. 3
D. 2
One of the earliest symptoms of Vit. A deficiency is________________?
A. Nyctalopia
B. Bitot’s spot
C. Xerophthalmia
D. Keratomalacia
The enzyme phosphofructo kinase-1 is strongly activated by_______________?
A. Adenosine tri phosphate
B. Cyclic AMP
C. Citrate
D. Fructose 2,6 bis phosphate
Megnesium is needed for the activity of which enzymes ?
A. Aldolase
B. Phosphatase
C. Dismutase
D. ATPase
When the prosthetic group of an enzyme is an inorganic ion, it is called a_____________?
A. Cofactor
B. Apoenzyme
C. Coenzyme
D. Holoenzyme
Coenzyme, in an enzymatic reaction usually functions to_____________?
A. Increase the active sites of apoenzyme
B. Activate the substrate
C. Enhance the specificity of apoenzyme
D. Accept one of the cleavage products
The most common enzyme deficiency in man is___________?
A. Glucose 6 phosphate dehydrogenase
B. Hexokinase
C. Glucose 6 phosphatase
D. Glucose 1,6 diphosphatase
Enzymes concerned with the citric acid cycle are found in______________?
A. Ribosomes
B. Mitochondria
C. Nucleus
D. Non-particulate cytoplasm
Serum alkaline phosphatase level increase in_______________?
A. Carcinoma of prostate
B. Hypothyroidism
C. Hyperparathyroidism
D. Myocardial infarction
The enzyme that splits hydrogen peroxide into water and oxygen is_____________?
A. Cytochrome P 450
B. Cytochromes
C. Super oxide dismutase
D. Catalase
Vitamins MCQs
Enzyme that catalyses the transfer of a molecule group from one molecule to another is_____________?
A. Peptidases
B. Oxidases
C. Transferases
D. LIpases
The activity of this plasma enzyme is responsible virtually for all plasma cholesterol esters in humans_______________?
A. Lecithin cholesterol acyl transferase (LCAT)
B. HMG CoA reductase
C. Pyrophospho mevalonate decarboxylase
D. Phospho mevalonate kinase
Enzymes are classified according to_________________?
A. Action on substrate
B. Nature of the enzymes
C. Action of coenzymes
D. All of the abov
Fraction of CPK is an enzyme that is elevated in a myocardial infarct is____________________?
A. BB fraction
B. MB fraction
C. MM fraction
D. Both MM and BB fraction
A material that speeds up a chemical reaction without chemically becoming involved is called_____________?
A. A base
B. A solvent
C. A catalyst
D. Thermoplastic
Km of an enzyme is_____________?
A. The normal physiological substrate concentration
B. Dissociation constant
C. Substrate concentration at half maximal velocity
D. Numerically identical for all isozymes that catalyses a given reaction
Acetyl Co-A acts as a substrate for all the enzymes except______________?
A. Malonyl CoA synthetase
B. Malic enzyme
C. HMG-Co A synthase
D. Fatty acid synthetase
The enzyme that is specifically increased in obstructive jaundice is_____________?
A. Glutamate pyruvate transaminase
B. Glutamate oxaloacetate transaminase
C. Alkaline phosphaase
D. Acid phosphatase
Elevated levels of serum glutamic oxaloacetic transaminase in indicative of______________?
A. Deficiency of oxaloacetic acid
B. Deficiency of glutamic acid
C. Liver disease
D. All of the above
Muscle glycogen, which cannot contribute to blood glucose due to the absence of which enzymes ?
A. Branching enzyme
B. Phosphoglutamase
C. Debranching enzyme
D. Glucose-6-phosphotase
Michaelis-Menten hypothesis states that_____________?
A. Km is the enzyme substrate complex association constant
B. Rate of non enzymatic reaction is proportional to substrate concentration
C. Rate of enzymatic reaction is independent of substrate concentration
D. Enzyme- substrate complex formation is essential in enzymatic reaction
Coenzyme responsible for single carbon transfer is______________?
A. Biotin
B. Acetyl co enzyme A
C. THF4
D. Pyridoxine
Hexokinase is a______________?
1. Transferase
2. Oxidoreductase
3. Reductase
4. Oxidase
Enzyme + coenzyme constitutes_____________?
A. Proenzyme
B. Apoenzyme
C. Protoenzyme
D. Holoenzyme