Description : Immediate precursor of epinephrine is (A) Metanephrine (B) Norepinephrine (C) Dopa (D) Dopamine
Last Answer : Answer : B
Description : The neurotransmitter agent that is normally released in the sinoatrial node of the heart in response to a blood pressure increase is (a) Acetylcholine (b) Dopamine (c) Epinephrine (d) Glutamate (e) Norepinephrine
Last Answer : Ans: A
Description : The rate limiting step in the biosynthesis of catecholamines is (A) Decarboxylation of dihydroxyphenylalanine (B) Hydroxylation of phenylalanine (C) Hydroxylation of tyrosine (D) Oxidation of dopamine
Last Answer : Answer : C
Description : The enzyme dopamine β-oxidase which catalyses conversion of dopamine to norepinephrine requires (A) Vitamin A (B) Vitamin C (C) Vitamin E (D) Vitamin B12
Description : All the following hormones promote hyperglycemia except (A) Epinephrine (B) Norepinephrine (C) Insulin (D) Glucagon
Description : Dopa decarboxylase is inhibited by (A) Epinephrine (B) Norepinephrine (C) α−Methyldopa (D) None of these
Description : Tyrosine is required for the synthesis of all of the following except (A) Melatonin (B) Epinephrine (C) Norepinephrine (D) Thyroxine 222 MCQs IN BIOCHEMISTRY
Last Answer : Answer : A
Description : Cyclic GMP acts as the second messenger for (A) Nerve growth factor (B) Atrial natriuretic factor (C) Epinephrine (D) Norepinephrine
Description : Epinephrine is derived from norepinephrine by (A) Decarboxylation (B) Hydroxylation (C) Oxidation (D) N-methylation
Last Answer : Answer : D
Description : Epinephrine is synthesised in (A) Chromaffin cells of adrenal medulla (B) Sympathetic ganglia (C) Brain (D) All of these
Description : Blood brain barrier can be crossed by (A) Epinephrine (B) Dopamine (C) Dopa (D) All of these
Description : In the synthetic pathway of epinephrine, disulfiram (antabuse) inhibits the enzyme: (A) Tyrosine hydroxylase (B) Dopamine β-hydroxylase (C) DOPA decarboxylase (D) N-methyl transferase
Description : Which of the following statement(s) is/are true concerning pharmacologic agents used in the treatment of shock? a. The primary difference between dopamine and dobutamine is the absence of significant a ... b-adrenergic effect, is a particularly useful agent in the treatment of all forms of shock
Last Answer : Answer: a, b, c Therapeutic adjustments of intravascular volume (preload) and systemic vascular resistance (afterload) form the basis of the treatment strategies for all ... careful constant monitoring of arterial pressure and repeated hemodynamic measurements with a pulmonary artery catheter
Description : Following events occur in the cytoplasm and not inside storage vesicles, except (a) Conversion of tyrosine to dopa (b) Conversion of dopa to dopamine (c) Conversion of dopamine to norepinephrine (d) Conversion of dopamine to 3,4 dihydroxy phenyl acetic acid
Last Answer : Ans: C
Description : Parkinson’s disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter (a) acetylcholine (b) norepinephrine (c) dopamine (d) GABA.
Last Answer : c) dopamine
Description : Vasoactive drugs which cause the arteries and veins to dilate, thereby shunting much of the intravascular volume to the periphery and causing a reduction in preload and afterload include agents ... Furosemide (Lasix) Furosemide (Lasix) is a loop diuretic that reduces intravascular fluid volume.
Last Answer : a) Sodium nitroprusside (Nipride) Sodium nitroprusside is used in the treatment of cardiogenic shock.
Description : What is the function of epinephrine and norepinephrine? -Biology
Last Answer : answer:
Description : Choose the correct statement from the following about a1 – adrenergic receptor agonists (a) Norepinephrine > isoproterenol > epinephrine (b) Norepinephrine < epinephrine > isoproterenol (c) Epinephrine = norepinephrine >> isoproterenol (d) Epinephrine > isoproterenol > norepinephrine
Description : Select the correct statement from the following about a1 – adrenergic receptor agonists (a) Isoproterenol > epinephrine = norepinephrine (b) Epinephrine > isoproterenol > norepinephrine (c) Isoproterenol = epinephrine = norepinephrine (d) Epinephrine = norepinephrine > isoproterenol
Description : Action of norepinephrine and epinephrine are terminated by (a) Reuptake into nerve terminal (b) Dilution by diffusion and uptake at extraneuronal site (c) Metabolic transformation (d) All of the above
Last Answer : Ans: D
Description : Which of the following drugs is the drug of choice in anaphylaxis associated with bronchospasm and hypotension ? (a) Cortisone (b) Epinephrine (c) Isoproterenol (d) Norepinephrine (e) Phenylephrine
Last Answer : Ans: B
Description : A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro- hormonal control system? ... brain. (d) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex.
Last Answer : (a) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla.
Description : Fight-or-flight reactions cause activation of (a) the parathyroid glands, leading to increased metabolic rate (b) the kidney, leading to suppression of renin- angiotensin-aldosterone pathway (c) ... epinephrine and norepinephrine (d) the pancreas leading to a reduction in the blood sugar levels.
Last Answer : (c) the adrenal medulla, leading to increased secretion of epinephrine and norepinephrine
Description : Which one of the following does not act as a neurotransmitter? (a) Cortisone (b) Acetylcholine (c) Epinephrine (d) Norepinephrine
Last Answer : (a) Cortisone
Description : Which pair of hormones has opposite, antagonistic effects? A) insulin--glucagon B) insulin--progesterone C) estrogen--thyroxin D) thyroxin--parathyroid hormone E) epinephrine--norepinephrine
Last Answer : A) insulin--glucagon
Description : What is the cascade of events that follows a stress or trauma to produce adrenal reaction? A) hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)-adrenal cortex mineralocorticoids and ... ) E) adrenal cortex (hormones)-hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)
Last Answer : A) hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)-adrenal cortex mineralocorticoids and glucocorticoids (regulate metabolism and sugar level)
Description : Which of the following vasoactive drugs used in treating shock results in reduced preload and afterload, reducing oxygen demand of the heart? a) Nitroprusside (Nipride) A disadvantage ... increases cardiac output. d) Methoxamine (Vasoxyl) Methoxamine increases blood pressure by vasoconstriction.
Last Answer : a) Nitroprusside (Nipride) A disadvantage of nitroprusside is that it causes hypotension.
Description : Which one of the following drugs does NOT act through G-Protein coupled receptors? (A) Epinephrine (B) Insulin (C) Dopamine (D) TSH
Last Answer : (B) Insulin
Description : The chief metabolite of catecholamines is (A) Metanephrine (B) Normetanephrine (C) 3, 4-Dihydroxymandelic acid (D) Vanillylmandelic acid
Description : Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires (A) NAD (B) FAD (C) ATP (D) Tetrahydrobiopterin
Description : Prolactin release inhibiting hormone is believed to be (A) Serotonin (B) Norepinephrine (C) Dopanine (D) Acetyl choline
Description : Norepinephrine binds mainly to (A) α-Adrenergic receptors (B) β-Adrenergic receptrors (C) Muscarinic receptors (D) Nicotinic receptors
Description : Androgens are synthesised in (A) Leydig cells in testes (B) Sertoli cells in testes (C) Seminiferous tubules (D) Prostate gland
Description : All the following statements about transcortin are true except (A) It is synthesised in liver (B) It transports glucocorticoids (C) It transports aldosterone (D) It transports progesterone
Description : Steroid hormones are synthesised from (A) Cholesterol (B) 7-Dehydrocholesterol (C) Calcitriol (D) 7-Hydroxycholesterol
Description : Steroid hormones are synthesised in all of the following except (A) Testes (B) Ovaries (C) Adrenal medulla (D) Adrenal cortex
Description : Parathyroid hormone (PTH) is synthesised in (A) Chief cells of parathyroid glands (B) Oxyphil cells of parathyroid glands (C) Para follicular cells of thyroid glands (D) Follicular cells of thyroid gland
Description : All the following statements about proopiomelanocortin are true except (A) It is made up of 285 amino acids (B) It is synthesised in pars intermedia and anterior lobe of pituitary gland ... ) It is the precursor of corticotropin like intermediate lobe peptide and endorphins 218 MCQs IN BIOCHEMISTRY
Description : A hormone synthesised in the hypothalamus is (A) Melatonin (B) Melanocyte stimulating hormone (C) Vasopressin (D) Prolactin
Description : Melatonin is synthesised from (A) Phenylalanine (B) Tyrosine (C) Tryptophan (D) None of these
Description : Melatonin is synthesised in (A) Hypothalamus (B) Posterior pituitary gland (C) Pineal gland (D) Melanocytes
Description : All the following statements about ceruloplasmin are correct except (A) It is a copper-containing protein (B) It possesses oxidase activity (C) It is synthesised in intestinal mucosa (D) Its plasma level is decreased inWilson’s disease
Description : Niacin can be synthesised in human beings from (A) Histidine (B) Phenylalanine (C) Tyrosine (D) Tryptophan
Description : Prothrombin is synthesised in (A) Erythrocytes (B) Reticulo-endothelial cells (C) Liver (D) Kidneys
Description : All of the following statements about Tangier disease are true except (A) It is a disorder of HDL metabolism (B) Its inheritance is autosomal recessive (C) Apoproteins A-I and A-II are not synthesised (D) Plasma HDL is increased
Description : All the following statements about carnitine are true except (A) It can be synthesised in the human body (B) It can be synthesized from methionine and lysine (C) It is required for transport of short chain fatty acids into mitochondria (D) Its deficiency can occur due to haemodialysis
Description : In I-cell disease, lysosomal enzymes (A) Are not synthesised (B) Are inactive (C) Lack signal sequence (D) Cannot reach lysosomes
Description : Serotonin is synthesised from (A) Serine (B) Phenylalanine (C) Tyrosine (D) Tryptophan
Description : Histamine is synthesised in (A) Brain (B) Mast cells (C) Basophils (D) All of these
Description : Calcitonin is synthesised in (A) Parathyroid glands (B) Thyroid gland (C) Pars intermedia of pituitary (D) Adrenal cortex