Repeated USMLE Questions Step 1- Review- 86

Q- Which one of the following nerves is affected in a patient diagnosed with tarsal tunnel syndrome?

A- Common peroneal nerve

B- Deep fibular nerve

C- Lateral femoral cutaneous nerve

D- Tibial nerve

D- Tibial nerve- Tarsal tunnel syndrome is caused by damage to the tibial nerve. It causes pain, numbness and/or tingling around ankle and sole of the foot.

Q- Phenylketonuria occurs due to deficiency of which one of the following enzymes?

A- Dopamine B-hydroxylase

B- Phenylalanine decarboxylase

C- Phenylalanine hydroxylase

D- Tyrosine hydroxylase

C- Phenylalanine hydroxylase- Deficiency of this enzyme leads to decreased metabolism of phenylalanine which results in accumulation of this amino acid. It leads to intellectual disabilities and seizures.

Q- Which of the following is the mechanism of action of naproxen?

A- Irreversibly inhibits both COX-1 and COX-2 enzymes

B- Reversibly inhibits COX-1 enzyme only

C- Reversibly inhibits COX-2 enzyme only

D- Reversibly inhibits both COX-1 and COX-2

D- Reversibly inhibits both COX-1 and COX-2- Naproxen is a nonsteroidal anti-inflammatory drug that directly inhibits both cyclooxygenase-1 and -2.  

More Repeated USMLE Questions Step 1

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2 thoughts on “Repeated USMLE Questions Step 1- Review- 86”

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