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HORMONE METABOLISM- Part 5
See all quizzes of HORMONE METABOLISM- Part 5 here:
1 Serum progesterone level during pregnancy
is
(A) < 12 ng/ml (B) > 12 ng/ml
(C) < 20 ng/ml (D) >24 ng/ml
2. Serum progesterone level during luteal
phase is
(A) 0.2–203 ng/ml (B) 3.0–5.0 ng/ml
(C) 6.0–30 ng/ml (D) 750 ng/ml
3. Androgens are produced by
(A) Cells of sertoli
(B) Leydig cells
(C) Rete testis
(D) Efferent ductules
4. The leyding cell activity is controlled by
(A) Intestitial cell stimulating hormone
(B) Adernocortex stimulating hormone
(C) Thyroid stimulating hormone
(D) Melanocyte stimulating harmone
5. Stein-leventhal syndrome is due to overproduction
of
(A) Estrogens (B) Androgens
(C) Gastogens (D) Ethinyl estradiol
6. The production of progesterone by corpus
luteum cell is stimulated by
(A) LH (B) TSH
(C) ACTH (D) MSH
7. In the biosynthesis of testosterone the
rate limiting step is conversion of
(A) Cholesterol to pregnenolone
(B) Pregnenolone to progesterone
(C) Progesterone to 17 α-hydroxy progesterone
(D) 17 α-Hydroxy progesterone to androstenedione
8. The enzyme catalyzing conversion of androstenedione
to testosterone is a
(A) Oxygenase (B) Dehydrogenase
(C) Isomerase (D) Decarboxylase
9. Conversion of testosterone to estradiol
requires the enzyme:
(A) Aromatase (B) Dehydrogenase
(C) Lyase (D) Isomerase
10. The precursor of testosterone is
(A) Aldosterone (B) Methyl testosterone
(C) Estrone (D) Pregnenolone
11. 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
12. The hormone measured in urine to test
pregnancy is
(A) Anterior pituitary luteinizing hormone
(B) Androgen
(C) Progesterone
(D) Choroinic gonadotropin
13. Total number of amino acids in human
chorionic gonadotropin is
(A) 53 (B) 92
(C) 145 (D) 237
14. A hormone produced by corpus luteum
and placenta, concerned with relaxation
of pelvis tissue is
(A) HCG
(B) Chorionic somatommotropin
(C) Relaxin
(D) Progestins
15. Synthetic progesterone used in oral
contraceptive is
(A) Norethindrone (B) Pregnenolone
(C) Androstenodione (D) Stilbestrol
16. Young women are protected against
myocardial infaracation because of the
activity of
(A) Estrogen (B) Progesterone
(C) Growth hormone (D) Oxytocin
17. 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
18. 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
19. 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
20. 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
21. 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
22. Cyclic AMP acts as the second messenger
for
(A) ADH (B) Glucagon
(C) Calcitonin (D) All of these
23. Cyclic AMP acts as the second messenger
for all of the following except
(A) Oxytocin (B) TSH
(C) ACTH (D) FSH
24. Cyclic GMP acts as the second messenger
for
(A) Nerve growth factor
(B) Atrial natriuretic factor
(C) Epinephrine
(D) Norepinephrine
25. Some hormones produce their intracellular
effects by activating
(A) Phospholipae A1 (B) Phospholipase B
(C) Phospholipase C (D) All of these
26. Inositol triphosphate is the second
messenger for
(A) Gastrin (B) Cholecystokinin
(C) Oxytocin (D) All of these
27. G-proteins act as
(A) Hormone carriers
(B) Hormone receptors
(C) Second messengers
(D) Signal transducers
28. Signal transducer for glucagons is a
(A) Cyclic nucleotide
(B) Phosphoinositide
(C) Stimulatory G-protein
(D) Inhibitory G-protein
29. G-proteins are
(A) Monomers (B) Dimers
(C) Trimers (D) Tetramers
30. G-proteins have a nucleotide binding site
for
(A) ADP/ATP (B) GDP/GTP
(C) CDP/CTP (D) UDP/UTP
