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
Correct Answer :
A. occurs after acrosome reaction
capacitation occurs before acrosome reaction.
Related Questions
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
Which part of the male urethra is the narrowest?
the membranous
the bladder neck
the bulbous
the external urethral meatus
By which of the following structures, do the fused lower poles of hoarseshoe kidneys get trapped during embryologic ascent?
inferior mesenteric artery
superior mesenteric artery
celiac artery
common iliac artery
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
In which body tissue(s) are creatine and phosphocreatine converted to creatinine?
bone marrow
skeletal muscles
brown fat
liver
The epithelial component of the prostate consists of all of the following, EXCEPT:
basal cells
intermediate cells
tubulo-columnar cells
neuroendocrine cells
What is false concerning PSA molecule?
the free form of PSA exists in small proportions in the body, and found mainly in BPH and in the ejaculate
α1- anti chymotrypsin binds to 3 epitopes of the PSA molecule to form a complexed PSA
α2- macroglobulin binds to 5 epitopes of the PSA molecule to form a complexed PSA
the purified PSA molecule has a molecular weight of 90 kDa
What causes Cushing`s disease is:
bilateral adrenal hyperplasia
pituitary over secretion of ACTH
exogenous administration of glucocorticoids
immune-mediated disease
How many days does spermatogenesis take in the man?
16
32
64
90
Which of the following is false regarding Addison`s disease?
autoimmune disease in 70% of the cases
diagnosed by the rapid ACTH stimulation test
characterized by low serum sodium and high potassium
may coexist with hyperthyroidism and diabetes mellitus
Which area in the nervous system is tested by bulbocavernosus reflex?
brain stem
C2 C4
S2 - S4
L2 - L4
Which of the prostate medications could result in significant hypotension?
finasteride
prazosin
silodosin
vardenafil
To which group of lymph nodes do tumors at the anterior superior area of the bladder, first, drain?
hypogastric
internal iliac
external iliac
lateral sacral
What is false concerning coagulase splitting bacteria (Griess) test?
it is a reduction reaction that converts nitrate to nitrite
nitrazine reagent papers are used to elicit the reaction
it is false negative in diluted urine, on taking vitamin C, and in gram +ve bacteria
the reaction takes 4 minutes to complete
What type of renal tubular acidosis (RTA) does demonstrate aldosterone resistance?
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 of the following is false regarding zona glomeruloza?
the most superficial layer of the adrenal cortex
responses to increased potassium levels, renin or decreased renal blood flow
it causes pheochromocytoma
secretes aldosterone
What is the creatinine clearance in ml/min for a 70 kg man aging 50 yrs. with 1.1 mg/dL serum creatinine?
79.54
44.19
84.15
94.25
In which condition can NOT creatinine level be 1200 mg/dL?
an aspirate of pelvic urinoma
in untreated end-stage renal failure disease
a sample from a wound drain after pyeloplasty
a sample from suprapubic catheter
Between which 2 fascial planes does the prostatic neurovascular bundle travel?
prostatic fascia and levator fascia
prostate capsule and prostatic fascia
Denonvilliers fascia and prostate capsule
Denonvilliers fascia and endopelvic fascia
How does estrogen prevent lower UTI in postmenopausal women?
increasing vaginal secretions
decreasing vaginal pH
increasing normal vaginal flora
decreasing bacterial adherence
What is false about purple urine bag syndrome?
occurs due to the interaction between the chemical components of the urine and polyvinyl chloride material in the urine bag
it is commonly symptomless
more common in female nursing home residents
commonly implicated bacteria are K. pneumoniae, P. mirabilis, E. coli
What is the most frequent anomaly associated with multicystic renal dysplasia?
ureteral atresia
vesicoureteral reflux
ureteropelvic junction obstruction
ureteral duplication
Which of the following is (are) direct branch(es) of the abdominal aorta?
median sacral artery
inferior phrenic arteries
gonadal arteries
all of the above
Which of the following contributes second to the seminal fluid by volume?
seminal vesicles
the prostate
testes
bulbourethral glands
Which statement concerning urine pH is false?
influenced by food and medications
renal stones form at the extremes of pH range
reliable only when measured by 24 hr. urine collection
ranges from 4 7
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
Which of the following is NOT a sex accessory tissue?
the prostate gland
seminal vesicles
epididymi
bulbourethral glands
Which of the following is NOT related to von Hippel-Lindau disease?
retinal hemangioblastoma
ureteral atresia
pheochromocytomas
multiple cysts in the pancreas and kidneys
What increases blood volume and pressure in corpora cavernosa during erection is:
increase in sympathetic discharge
contraction of ischiocavernosa and bulbocavernosa muscles
increase arterial flow and closure of emissary veins
shunting of blood from the dorsal to the central cavernosal artery