USMLE Step 1 Quiz
20 questions · no time limit
0:00
GENETICS
Question 1 of 20
No time limit
Current
Answered
Flagged
Not seen
PASSAGE
A 10-year-old boy is evaluated for multiple light-brown macules on his trunk and axillary freckling. A slit-lamp examination reveals pigmented hamartomas of the iris (Lisch nodules). His clinical picture is consistent with neurofibromatosis type 1 (NF1).
The protein affected in this patient's disorder normally functions to negatively regulate which of the following signaling proteins?
YOUR PROGRESS
20
QUESTIONS
Ready when you are
Answer in any order. Your progress shows here as you go.
QUESTIONS
KEYBOARD
Pick an answer ABCD
Next question ↵→
Previous ←
Flag for review F
Answers save as you go · flagged questions come back at the end