COMLEX-USA Biomedical Sciences 2

Question 1

Which type of collagen is most abundant in articular cartilage?

Accepted Answer

Type II collagen

Answer

Type I collagen

Answer

Type III collagen

Answer

Type IV collagen

Question 2

Nitric oxide (NO) produces vasodilation primarily by activating which intracellular enzyme?

Accepted Answer

Soluble guanylyl cyclase

Answer

Phosphodiesterase

Answer

Adenylyl cyclase

Answer

Protein kinase C

Question 3

A child has recurrent pyogenic infections with bacteria and fungi. Flow cytometry shows absent CD18. Which condition is this?

Accepted Answer

Leukocyte adhesion deficiency (LAD)

Answer

Chronic granulomatous disease

Answer

Chediak-Higashi syndrome

Answer

DiGeorge syndrome

Question 4

The sodium-potassium ATPase pump maintains the resting membrane potential by moving:

Accepted Answer

3 Na+ out and 2 K+ in per cycle

Answer

2 Na+ out and 3 K+ in per cycle

Answer

3 Na+ in and 2 K+ out per cycle

Answer

Equal Na+ and K+ in opposite directions

Question 5

Which immunoglobulin class is the first to be produced in a primary immune response?

Accepted Answer

IgM

Answer

IgG

Answer

IgA

Answer

IgE

Question 6

Okazaki fragments are synthesized on which strand during DNA replication?

Accepted Answer

Lagging strand

Answer

Leading strand

Answer

Template strand

Answer

Non-template strand