Free USMLE USMLE Exam Questions

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Total 630 Questions | Updated On: Oct 28, 2025

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Question 1

Which of the following types of immunoglobulins does not cross the barrier between mother and infant in the womb?

A : IgA

B : IgM

C : IgD

D : IgE

Answer: A

Question 2

Which of the following enzyme breaks down starches to maltose?

A : Amylase

B : Lipase

C : Trypsinogen

D : Pepsin

Answer: A

Question 3

A 33-year-old man undergoes a radical thyroidectomy for thyroid cancer. During the operation, moderate hemorrhaging requires ligation of several vessels in the left side of the neck. Postoperatively, serum studies show a calcium concentration of 7.5 mg/dL, albumin concentration of 4 g/dL, and parathyroid hormone concentration of 200 pg/mL. Damage to which of the following vessels caused the findings in this patient?

A : Branch of the costocervical trunk

B : Branch of the external carotid artery

C : Branch of the thyrocervical trunk

D : Tributary of the internal jugular vein

E : Tributary of the left brachiocephalic vein

F : Tributary of the right brachiocephalic vein

Answer: C

Question 4

Which is found in the highest concentration in the urine?

A : Uric acid

B : Urea

C : Glucose

D : Creatinine

Answer: B

Question 5

Which of the following is not appropriately matched with the term: Braxton Hicks contractions?

A : Painless

B : Intermittent contractions

C : Edema

D : Irregular

Answer: C

Page: 1 / 126

Total 630 Questions | Updated On: Oct 28, 2025

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