Which of the following process(es) is (are) reversible?
5α-reductase enzyme reduces testosterone to DHT
aromatase enzyme reduces testosterone to estrogen
PSA molecule binds to α1-antichymotrypsin and α2-macroglobulin
none of the above
Correct Answer :
D. none of the above
all of the indicated conversions are irreversible.
Related Questions
In which organelle in Leydig cell does testosterone synthesis take place?
ribosome
mitochondria
Golgi apparatus
endoplasmic reticulum
What is the best initial therapy for hyponatremic dehydration?
administration of hypertonic saline
administration of crystalloid
administration of normal saline
administration of ringer lactate
Which disease is described best by the following manifestations: grand mal epilepsy, mental retardation, hypertension, angiomyolipoma, adenoma sebaceum, bilateral enlarged kidneys, and normal renal function?
autosomal dominant polycystic kidney disease
von Hippel-Lindau disease
tuberous sclerosis
Sturge-Webber syndrome
How can hyperuricosuria cause calcium oxalate calculi?
by increasing oxalate absorption
by heterogeneous nucleation
by inducing hyperoxaluria
by reducing urate crystals saturation
In males, which of the following structure(s) can NOT be palpated during digital rectal examination?
pelvic floor muscles
seminal vesicles
anterior surface of the sacrum
median lobe of the prostate
Which layer lies between the superficial and deep inguinal lymph nodes?
Scarpa`s fascia
fascia lata
Dartos fascia
Camper`s fascia
What is false about indinavir sulfate stones?
intratubular crystal formation might occur
CT cannot reliably confirm the presence of indinavir calculi
stone formation is demonstrated in 80% of patients taking the medication
is a protease inhibitor with poor solubility and significant urinary excretion
What are the posterior relations of the kidneys?
quadratus lumborum and diaphragm
psoas and diaphragm
psoas and latissimus dorsi
transversus abdominus and paraspinous
Which class of the following agents does NOT impair spermatogenesis?
alkylating agents
phenothiazines
antiandrogens
prostaglandins
What nerve provides the major neural supply to the striated urinary sphincter and levator ani muscle?
somatic innervations
sympathetic fibers from T11 - L2
the pudendal nerve
the obturator nerve
Which group(s) of lymph nodes drain(s) the glans penis?
internal and external iliac
superficial inguinal
deep inguinal
superficial and deep inguinal
What is the half-life of β-HCG?
5 7 days
24 36 hours
2 3 days
12 24 hours
Which anomaly might accompany horseshoe kidneys?
ureteropelvic junction obstruction
ureterocele
ureteral reflux
ureteral atresia
The mature genitourinary system develops from all of the following embryonic sources, EXCEPT:
intermediate mesoderm
mesothelium of celomic cavity
endoderm of the urogenital sinus
somatic ectoderm
At which week of gestation do the primordial germ cells migrate to form the genital ridges?
third
fourth
fifth
seventh
Which statement is false concerning capacitation of spermatozoa?
occurs after acrosome reaction
entails removal of a glycoprotein layer
it is a biochemical event of sperm maturation
changes occur in the female genital tract
How many days does spermatogenesis take in the man?
16
32
64
90
Which of the following diabetes mellitus treatments causes erectile dysfunction?
long-acting insulin
metformin
sulfonylurea
none of the above
Which of the following contributes second to the seminal fluid by volume?
seminal vesicles
the prostate
testes
bulbourethral glands
Which part of the prostate is traversed by the ejaculatory duct:
central zone
peripheral zone
transitional zone
fibromuscular stroma
Which period of intrauterine life does the process of organ formation (organogenesis) take place?
9 12 weeks
12 15 weeks
15 18 weeks
18 21 weeks
Which of the following does NOT increase PSA value?
trauma to the prostate
digital rectal examination
urinary retention
prostatitis
At which type of renal tubular acidosis (RTA), typically, potassium levels increase?
type 1
type 2
type 3
type 4
Which class of the following diuretics could cause erectile dysfunction?
loop diuretics
thiazide diuretics
potassium sparing diuretics
osmotic diuretics
Which statement is false concerning the gubernaculua?
degenerate after birth
called the caudal genital ligaments
help guide the testes down through the inguinal canals
represent undifferentiated mesenchyme
In utero, which hormone stimulates the development of Wolffian ducts?
estradiol
DHT
FSH
testosterone
From where does the main parasympathetic efferent innervation to the pelvic plexus arise?
S1
S2-S4
T11-L2
L3-S1
Which statement regarding post-obstructive diuresis (POD) is false?
urine production exceeding 200 ml/hr for 2 consecutive hours or producing greater than 3 L of urine in 24 hours is diagnostic of POD
pathologic POD can be exacerbated by excessive fluid replacement
the replacement fluid choice is ringer lactate
fluid resuscitation depends on the degree of dehydration
Which of the following is NOT related to von Hippel-Lindau disease?
retinal hemangioblastoma
ureteral atresia
pheochromocytomas
multiple cysts in the pancreas and kidneys
Adult size of bladder capacity is achieved at what age?
5 6 yrs.
7 8 yrs.
9 10 yrs.
11 12 yrs.