Repeated USMLE Questions Step 1- 365

Q- The anterior pituitary is derived from which of the following structures?

A- Infundibulum

B- Neurohypophysis

C- Rathke’s pouch

D- Third pharyngeal arch

C- Rathke’s pouch- Posterior pituitary is derived from neurohypophysis. 

Q- Which one of the following is most likely normal in duodenal ulcer?

A- Fasting serum gastrin

B- Parietal cell mass

C- Pepsin secretion

D- Response of gastrin to food

A- Fasting serum gastrin- Other choices are all elevated in duodenal ulcers

Q- Deficiency of which of the following enzymes results in elevated serum levels of alanine and lactate?

A- Alanine aminotransferase

B- Glucose-6-phosphatase

C- Lactate dehydrogenase

D- Pyruvate dehydrogenase

D- Pyruvate dehydrogenase- PDH deficiency leads pyruvate to take another pathway and converted to alanine by alanine aminotransferase and to lactate by lactate dehydrogenase.

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