Source: USMLE Bulletin of Information 2010
A 29-yr old Caucasian male requests treatment for infertility. Routine patient
history reveals frequent colds and sinus infections. Examination of a semen
sample shows large numbers of non-motile spermatozoa. Chest and abdominal
X-rays reveal multiple anatomic abnormalities. Analysis of the patient’s spermX-rays reveal multiple anatomic abnormalities. Analysis of the patient’s sperm
by electron micrsoscopy would most likely reveal;
A) Absence of basal bodies
B) Lack of mitochondria in the midpiece
C) Dynein arms missing from the outer doublets
D) Radial spokes are incorrectly coiled
E) Cross-links between axoneme and plasma membrane are
shortened
A) Flexing the left arm 60 degress
B) Extending the left arm 60 degress
C) Abducting the left arm more than 90 degrees
D) Internally rotating the left arm
E) Externally rotating the left arm
US & Canadian
(percentage)
IMG
(percentage)
Passing Score
USMLE Step 1 91 63 188 (75)
USMLE Step 2
CK
94 74 187 (75)
USMLE Step 2
CS
97 70 Pass/Fail
USMLE Step 3 94 71 187 (75)
USA
Internal Med – 3 yrsInternal Med – 3 yrs
Family Med – 3 yrs
General Surgery – 5 yrs
Pediatrics – 3 yrs
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