Biology MCQs with Answer by General knowledge Solutions
Biology MCQs with Answer by General knowledge Solutions
00. The precursor of
testosterone is
(A) Aldosterone
(B) Methyl testosterone
(C) Estrone
(D) Pregnenolone
01. Urinary 17 ketosteroids
(A) Are not found in women
(B) Reflect the total production of androgenic substances
(C) Indicate the total production of sex hormone
(D) Are highly active androgens
02. The hormone
measured in urine to test pregnancy is
(A) Anterior pituitary luteinizing hormone
(B) Androgen
(C) Progesterone
(D) Choroinic
gonadotropin
03. Total number of amino acids in human
chorionic gonadotropin is
(A) 53
(B) 92
(C) 145
(D) 237
04. A hormone produced by corpus luteum and
placenta, concerned with relaxation of pelvis tissue is (A) HCG
(B) Chorionic somatommotropin
(C) Relaxin
(D) Progestins
05. Synthetic progesterone used in oral contraceptive
is
(A) Norethindrone
(B) Pregnenolone
(C) Androstenodione
(D) Stilbestrol
06. Young women are
protected against myocardial infaracation because of the activity of
(A) Estrogen
(B) Progesterone
(C) Growth hormone
(D) Oxytocin
07. Hormone receptors possess all the
following properties except
(A) All of them are proteins
(B) They possess a recognition domain
(C) They bind hormones with a high degree of specificity
(D) Number of receptors in a target cell is constant
08. The only correct
statement about hormone receptors is
(A) Receptors for protein hormones are present in cytosol
(B) Receptors for steroid hormones are membrane bound
(C) Hormone-receptor binding is irreversible
(D) Receptors can undergo down regulation and up regulatoin
09. Down regulation
is
(A) Increased destruction of a hormone
(B) Feed back inhibition of hormone secretion
(C) Decreased concentration of a hormone in blood
(D) Decrease in number of receptors for a hormone
10. All the following statements about
hormones are true except
(A) All of them require specific carriers in plasma
(B) All of them require specific receptors in target cells
(C) Some of them are subject to feedback regulation
(D) Some of them increase the transcription of certain genes
11. All the following statements about steroid
hormones are true except
(A) They are hydrophobic
(B) They require carriers to transport them in circulation
(C) Their receptors are intracellular
(D) They require cyclic AMP as second messenger
12. Cyclic AMP acts as the second messenger
for
(A) ADH
(B) Glucagon
(C) Calcitonin
(D) All of these
13. Cyclic AMP acts as the second messenger
for all of the following except
(A) Oxytocin
(B) TSH
(C) ACTH
(D) FSH
14. Cyclic GMP acts
as the second messenger for
(A) Nerve growth factor
(B) Atrial natriuretic factor
(C) Epinephrine
(D) Norepinephrine
15. Some hormones
produce their intracellular effects by activating
(A) Phospholipae A1
(B) Phospholipase B
(C) Phospholipase C
(D) All of these
16. Inositol triphosphate is the second messenger
for
(A) Gastrin
(B) Cholecystokinin
(C) Oxytocin
(D) All of these
17. G-proteins act as
(A) Hormone carriers
(B) Hormone receptors
(C) Second messengers
(D) Signal
transducers
18. Signal transducer
for glucagons is a
(A) Cyclic nucleotide
(B) Phosphoinositide
(C) Stimulatory G-protein
(D) Inhibitory G-protein
19. G-proteins are
(A) Monomers
(B) Dimers
(C) Trimers
(D) Tetramers
20. G-proteins have a nucleotide binding site
for
(A) ADP/ATP
(B) GDP/GTP
(C) CDP/CTP
(D) UDP/UTP
21. The nucleotide
binding site of G-proteins is present on their
(A) α-Subunit
(B) β-Subunit α- and β-
(C) γ-Subunit
(D) δ-Subunit
22. Adenylate cyclase is activated by
(A) GDP-bearing α-Subunit of G-protein
(B) GTP-bearing α-Subunit of G-protein
(C) GDP-bearing γ-Subunit of G-protein
(D) GTP-bearing γ-Subunit of G-protein
23. Tyrosine kinase activity is present in
(A) α-Adrenergic receptors
(B) β-Adrenergic receptors
(C) Cholinergic receptors
(D) Insulin receptors
24. Insulin receptor is a
(A) Monomer
(B) Dimer
(C) Trimer
(D) Tetramer
25. Tyrosine kinase activity is present in
(A) Acetylcholine receptor
(B) PDGF receptor
(C) ADH receptor
(D) All of these
26. Protein kinase C is activated by
(A) Cyclic AMP
(B) Cyclic GMP
(C) Diacyl glycerol
(D) Inositol triphosphate
27. Melatonin is
synthesised in
(A) Hypothalamus
(B) Posterior pituitary gland
(C) Pineal gland
(D) Melanocytes
28. Melatonin is synthesised from
(A) Phenylalanine
(B) Tyrosine
(C) Tryptophan
(D) None of these
29. Melanocyte
stimulating hormone is secreted by
(A) Pineal gland
(B) Anterior lobe of pituitary gland
(C) Posterior lobe of pituitary gland
(D) Intermediate lobe of pituitary gland
30. MSH causes
(A) Dispersal of melanin granules in melanocytes
(B) Increase in melanin concentration in melanocytes
(C) Decerease in melanin concentration in melanocytes
(D) Increase in number of melanocytes
31. Secretion of MSH is regulated by
(A) Feedback mechanism
(B) Melatonin
(C) Hypothalamic hormones
(D) ACTH
32. A hormone
synthesised in the hypothalamus is
(A) Melatonin
(B) Melanocyte stimulating hormone
(C) Vasopressin
(D) Prolactin
33. Posterior
pituitary gland secretes
(A) Catecholamines
(B) Oxytocin
(C) Follicle stimulating hormone
(D) Serotonin
34. A nonapeptide among the following is
(A) Antidiuretic hormone
(B) Insulin
(C) ACTH
(D) Thyrotropin releasing hormone
35. Diabetes insipidus is caused by deficient
secretion of
(A) Insulin
(B) Glucagon
(C) Vasopressin
(D) Oxytocin
36. Peripheral vasoconstriction is caused by
high concentrations of
(A) Antidiuretic hormone
(B) Melatonin
(C) Glucagon
(D) Oxytocin
37. Somatotropin is
secreted by
(A) Hypothalamus
(B) Anterior pituitary
(C) Posterior pituitary
(D) Thyroid gland
38. Secretion of
Insulin-like Growth Factor-I is promoted by
(A) Insulin
(B) Glucagon
(C) Growth hormone
(D) Somatomedin C
39. Growth hormone increases
(A) Protein synthesis
(B) Lipogenesis
(C) Glycogenolysis
(D) All of these
40. Secretion of growth hormone is inhibited
by
(A) Somatomedin C
(B) Somatostatin
(C) Feedback inhibition
(D) All of these
41. Secretion of somatotrophin is promoted by
(A) Somatomedin C
(B) Somatostatin
(C) Growth hormone releasing hormone
(D) Hypoglycaemia
42. Human growth
hormone has
(A) One polypeptide chain and one intra-chain disulphide
bond
(B) One polypeptide chain and two intra-chain disulphide
bond
(C) Two polypeptide chains joined by one disulphide bond
(D) Two polypeptide chains joined by two disulphide bond
00. D 01. B 02. D 03. D 04.C 05. A 06. A 07. D 08. D 09. D
10. A 11. D 12. D 13. A 14. B 15. C 16. D 17. D 18. C 19. C 20. B 21. A 22. B
23. D 24. D 25. B 26. C 27. C 28. C 29. D 30. B 31. C 32. C 33. B 34. A 35. C
36. A 37. B 38. C 39. A 40. B 41. C 42. B
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