Repeated USMLE Questions Step 1- 353

Q- Which of the following types of receptors are associated with the slowest response time?

A- G-protein coupled receptors

B- Ion channel receptors

C- Steroid receptors

D- Transmembrane enzyme receptors

C- Steroid receptors- Response to steroid receptors are measured by days or weeks while other receptors are measured by seconds or minutes.

Q- Which of the following tests would most likely indicates the etiology of vitamin B12 deficiency anemia?

A- Complete blood count (CBC)

B- Coomb’s test

C- Osmotic fragility test

D- Schilling test

D- Schilling test- Schilling test differentiates between pernicious anemia and vitamin B12 malabsorption

Q- Which of the following is the most serious contraindication of electroconvulsive therapy?

A- History of fracture

B- History of seizures

C- Meningioma

D- Old age

C- Meningioma- Space occupying lesions are the most serious contraindication of electroconvulsive therapy