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
Last Answer : Answer : C
Description : Adrenalin is synthesized from (A) Adenine (B) Adenosine (C) Tyrosine (D) Tryptophan 230 MCQs IN BIOCHEMISTRY
Description : Cyclic AMP acts as the second messenger for all of the following except (A) Oxytocin (B) TSH (C) ACTH (D) FSH 216 MCQs IN BIOCHEMISTRY
Last Answer : Answer : A
Description : All the following hormones promote hyperglycemia except (A) Epinephrine (B) Norepinephrine (C) Insulin (D) Glucagon
Description : TSH stimulates the synthesis delete (A) Thyroxine (B) Adrenocorticoids (C) Epinephrine (D) Insulin
Description : The amino acid tryptophan is the precursor for the synthesis of (a) estrogen and progesterone (b) cortisol and cortisone (c) melatonin and serotonin (d) thyroxine and triiodothyronine
Last Answer : (c) melatonin and serotonin
Description : The most efficacious inhibitor of catecholamine synthesis in the body is (a) a - methyl – p - tyrosine (b) a - methyldopa (c) a - methyl - norepinephrine (d) Pyrogallol
Last Answer : Ans: A
Description : The most efficacious inhibitor of catecholamine synthesis in the body is: A. α-methyl-p-tyrosine B. α-methyldopa C. α-methyl-norepinephrine D. Entacapone
Last Answer : A. α-methyl-p-tyrosine
Description : TSH hormone biochemically is a (A) Protein (B) Fat (C) Glycoprotein (D) Carbohydrate 232 MCQs IN BIOCHEMISTRY
Description : Whcih of the following hormone is a peptide of less than ten amino acids? (A) Insulin (B) Growth hormone (C) Oxytocin (D) Parathyroid hormone 228 MCQs IN BIOCHEMISTRY
Description : Phosphorylated IRS-1 activates GRB-2 which is (A) G-protein receptor binding protein-2 (B) Growth factor receptor binding protein-2 (C) Growth hormone receptor binding protein-2 (D) Glucocorticoid receptor binding protein-2 226 MCQs IN BIOCHEMISTRY
Last Answer : Answer : B
Description : Mineralocorticoids increase the tubular reabsorption of (A) Sodium and calcium (B) Sodium and potassium (C) Sodium and chloride (D) Potassium and chloride 224 MCQs IN BIOCHEMISTRY
Description : Secretion of thyroid hormones is regulated by (A) Hypothalamus (B) Anterior pituitary (C) Feedback regulation (D) All of these 220 MCQs IN BIOCHEMISTRY
Last Answer : Answer : D
Description : Normal serum free testosterone in adult men varies between (A) 1–5 ng/dl (B) 6–9 ng/dl (C) 10–30 ng/dl (D) 50–100 ng/dl 214 MCQs IN BIOCHEMISTRY
Description : Calcitonin causes (A) Calcinuria and phosphaturia (B) Decrease in urinary calcium (C) Decrease in urinary phosphorous (D) Increase in blood calcium level 212 MCQs IN BIOCHEMISTRY
Description : ADH (A) Reabsorbs water from renal tubules (B) Excretes water from renal tubules (C) Excretes hypotonic urine (D) Causes low specific gravity of urine 210 MCQs IN BIOCHEMISTRY
Description : Adrenocorticotropic hormone (ACTH) is a single polypeptide containing (A) 25 amino acid (B) 39 amino acid (C) 49 amino acid (D) 52 amino acid 208 MCQs IN BIOCHEMISTRY
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 : Dopa decarboxylase is inhibited by (A) Epinephrine (B) Norepinephrine (C) α−Methyldopa (D) None of these
Description : Immediate precursor of epinephrine is (A) Metanephrine (B) Norepinephrine (C) Dopa (D) Dopamine
Description : Dopamine is synthesised from (A) Dihydroxyphenylalanine (B) Epinephrine (C) Norepinephrine (D) Metanephrine
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
Description : Melatonin is synthesised from (A) Phenylalanine (B) Tyrosine (C) Tryptophan (D) None of these
Description : ACTH stimulates the secretion of (A) Glucocorticoids (B) Epinephrine (C) Thyroxine (D) Luteinizing hormone
Description : The desaturation and chain elongation system of polyunsaturated fatty acid are enhanced by (A) Insulin (B) Glucagon (C) Epinephrine (D) Thyroxine
Description : The desaturation and chain elongation system of polyunsaturated fatty acids are greatly diminished in the absence of (A) Insulin (B) Glycagon (C) Epinephrine (D) Thyroxine
Description : All the following statements about phenylketonuria are correct except (A) Phenylalanine cannot be converted into tyrosine (B) Urinary excretion of phenylpyruvate and phenyllactate is increased (C) It ... diet (D) It leads to decreased synthesis of thyroid hormones, catecholamines and melanin
Description : Which one of the following hormones is derived most completely from tyrosine? (A) Glucagon (B) Thyroxine (C) Insulin (D) Prostaglandins
Description : Thyroxine is derived from (A) Tyrosine (B) Tyranine (C) Taurine (D) Tryptaine
Description : T3 is (A) Thyroxine (B) Triodo thyronine (C) Triodo tyrosine (D) Reverse tri iodo thyronine
Description : In thyroxine, tyrosine residues are iodinated at positions: (A) 1 and 3 (B) 2 and 4 (C) 3 and 5 (D) 4 and 6
Description : Thyroperoxidase iodinates (A) Free tyrosine in thyroid gland (B) Tyrosine residues of thyroglobulin (C) Tyrosine residues of thyroxine binding globulin (D) Tyrosine residues of thyroxine binding prealbumin
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 : The sequential steps in the conversion of tyrosine to epinephrine are (A) Ring hydroxylation-decarboxylation-side chain hydroxylation-N-methylation (B) Side chain hydroxylation-decarboxylation- ... chain hydroxylation-N-methylation (D) N-methylation-decarboxylation-ring and side chain hydroxylation
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 : 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
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 : An enzyme required for the synthesis of thyroid hormones is (A) Iodinase (B) Deiodinase (C) Thyroperoxidase (D) Thyroxine synthetase
Description : Which is NOT a correct association of tissues and hormones or functions? A) adipose tissue--leptin to regulate a feeling of fullness B) thymus--use of iodine to make thyroxine for ... insulin for regulation of blood glucose levels E) pancreas--glucagon for regulation of blood glucose levels
Last Answer : B) thymus--use of iodine to make thyroxine for regulation of body growth
Description : Ascorbic acid is required to synthesise all of the following except (A) Collagen (B) Bile acids (C) Bile pigments (D) Epinephrine