Repeated USMLE Questions Step 1- Review- 64

Q- Which one of the following types of protein is the most likely deficient in a case of Duchene muscular dystrophy?

A- Actin

B- Dystrophin

C- Troponin

D- Titin

B- Dystrophin- It anchors actin reinforcing and stabilizing the sarcolemma. Troponin inhibits myosin and actin binding.

Q- Which one of the following locations is the most common site for carcinoid tumors?

A- Appendix

B- Esophagus

C- Colon

D- Small intestine

E- Stomach

A- Appendix-The tip of the appendix is the most common site of carcinoid tumors. They have less risk of malignancy than those originated from the ileum.

Q- A 27-year-old man complains of burning pain during micturition for 3 days. Milking the urethra produces a profuse yellowish discharge. He it treated with ceftriaxone. Which of the following is the most likely causative organism?

A- Hemophilus ducreyi

B- Herpes simplex virus

C- Neisseria gonorrhea

D- Treponema pallidum

C- Neisseria gonorrhea- Acute urethritis due to gonorrhea is a common complication of sexually active males.

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