COMLEX-USA Biomedical Sciences 3

Question 1

Which structure in the nephron is primarily responsible for concentrating urine through countercurrent multiplication?

Accepted Answer

Loop of Henle

Answer

Proximal convoluted tubule

Answer

Distal convoluted tubule

Answer

Collecting duct

Question 2

Wernicke's area, responsible for language comprehension, is located in which brain region?

Accepted Answer

Superior temporal gyrus, dominant hemisphere

Answer

Inferior frontal gyrus, dominant hemisphere

Answer

Inferior parietal lobule

Answer

Primary auditory cortex

Question 3

A missense mutation results in:

Accepted Answer

A single amino acid substitution

Answer

A premature stop codon

Answer

Insertion of an extra nucleotide

Answer

Deletion of a codon

Question 4

The bile salt-independent fraction of bile secretion is driven primarily by which mechanism?

Accepted Answer

Bicarbonate secretion by cholangiocytes

Answer

Cholesterol secretion

Answer

Glucuronidation

Answer

Active Na+ reabsorption

Question 5

Which cranial nerve is responsible for the afferent limb of the corneal reflex?

Accepted Answer

CN V1 (ophthalmic branch of trigeminal)

Answer

CN II

Answer

CN VII

Answer

CN III

Question 6

Which phase of fever is characterized by peripheral vasoconstriction and shivering?

Accepted Answer

Chill phase

Answer

Defervescence

Answer

Crisis phase

Answer

Plateau phase