medical MCQs – Page 373

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

7441. Enzymes help by____________?
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A. Decreasing the surface tension

B. Lowering the activation energy

C. Increasing the substrate concentration

D. Increasing the activation energy

7442. An enzyme that makes a double stranded DNA copy from a single stranded RNA template molecule is known as____________?
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A. Phospho kinase

B. RNA polymerase

C. DNA polymerase

D. Reverse transcriptase

7443. Nor epinephrine is converted to epinephrine by______________?
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A. Dopa decarboxylase

B. O-methylation

C. Dopamine hydroxylase

D. N-methylation

7444. The amino acid required for the synthesis of haem is______________?
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A. Glycine

B. Lysine

C. Glutamic acid

D. Glutamine

7445. Golgi bodies function are______________?
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A. Protein synthesis

B. None of the above

C. Sorting of glycoproteins

D. Protein lipid synthesis

7446. One of the earliest symptoms of Vit. A deficiency is________________?
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A. Bitots spot

B. Keratomalacia

C. Nyctalopia

D. Xerophthalmia

7447. Dehydrogenase used as coenzymes all of the following, except________________?
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A. NADP+

B. FMN

C. FAD

D. Ferro protoporphyrin

7448. Km of an enzyme is_____________?
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A. Numerically identical for all isozymes that catalyses a given reaction

B. Substrate concentration at half maximal velocity

C. Dissociation constant

D. The normal physiological substrate concentration

7449. Michaelis-Menten hypothesis states that_____________?
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A. Rate of enzymatic reaction is independent of substrate concentration

B. Enzyme- substrate complex formation is essential in enzymatic reaction

C. Rate of non enzymatic reaction is proportional to substrate concentration

D. Km is the enzyme substrate complex association constant

7450. Which cell organelle contains DNA_____________?
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A. Mitochondrion

B. Centriole

C. Golgi body

D. Endoplasmic reticulum

7451. Megnesium is needed for the activity of which enzymes ?
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A. Dismutase

B. ATPase

C. Aldolase

D. Phosphatase

7452. The enzyme involved in the first committed step of glycolysis is____________?
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A. Glucose-6-Phosphatase

B. Phosphofructokinase

C. Enolase

D. Hexokinase

7453. Which of the following is not a polymer of glucose?
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A. Amylase

B. Glycogen

C. Inulin

D. Cellulose

7454. Rate limiting step in adrenaline synthesis is conversion of____________?
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A. Dopamine to nor epinephrine

B. Tyrosine to dopa

C. Phenylalanine to tyrosine

D. Dopa to dopamine

7455. Benzidine test is positive with the enzyme______________?
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A. Hydrolase

B. Cytochrome oxidase

C. Dehydrogenase

D. Peroxidase

7456. Cofactor required for lipoprotein lipase activity is_______________?
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A. Apo A-II

B. Apo C-III

C. Apo C-II

D. Apo B-II

7457. Glycogen synthesis is increased by_____________?
0

A. Insulin

B. Epinephrine

C. Cortisone

D. GH

7458. Which of the following is precursor of adrenaline and thyroxine synthesis ?
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A. Tyrosine

B. Phenyl alanine

C. None of the above

D. Tryptophan

7459. Coenzyme, in an enzymatic reaction usually functions to_____________?
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A. Activate the substrate

B. Accept one of the cleavage products

C. Increase the active sites of apoenzyme

D. Enhance the specificity of apoenzyme

7460. All are true regarding glucose 6 phosphate deficiency except______________?
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A. Hyperuricemia

B. Increased mobilization of glycogen from liver

C. Defective cori cycle

D. Hyperglycemia

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