Biochemistry - Mock Test 66

Question 651

All of the following are glycoproteins except?

A) Collagen B) Albumin C) Transferrin D) IgM

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Question 652

Binding of acetylcholine to its receptors increases the permeability of cell membrane to?

A) Ca++ B) Na+ C) K+ D) Na+ and K+

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Question 653

Binding of gamma-aminobutyric acid to its receptors in brain increases the permeability of cell membrane to?

A) Cl– B) Na+ C) K+ D) Ca++

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Question 654

Methyl dopa decreases blood pressure by?

A) Inhibiting the synthesis of catecholamines B) Antagonising the action of aldosterone C) Stimulating the release of renin D) Inhibiting the breakdown of angiotensin

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Question 655

All the following statements about angiotensin are true except?

A) Its precursor is an α2-globulin B) Its active form is an octapeptide C) It is a vasodilator D) It increases the secretion of aldosterone

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Question 656

All the following statements about serotonin are true except?

A) It causes vasolidatation B) It causes bronchoconstriction C) It is metabolized by monoamine oxidase D) Its metabolite is 5-hydroxyindole acetic acid

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Question 657

Serotonin is synthesised from?

A) Serine B) Phenylalanine C) Tyrosine D) Tryptophan

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Question 658

H2-receptors are blocked by?

A) Diphenhydramine B) Mepayramine C) Pyrilamine D) Cimetidine

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Question 659

Histamine causes all the following except?

A) Stimulation of gastric secretion B) Vasoconstriction C) Pruritus D) Increase in capillary permeability

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Question 660

Histamine is synthesised in?

A) Brain B) Mast cells C) Basophils D) All of these

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