You are a doctor examining a patient's blood test results. The test results include the concentration of T cells. These cells:

A. mature in the thymus.
B. secrete antibodies.
C. secrete antigens.
D. are active only against bacteria.
E. participate in cell-mediated immunity.


E

Biology & Microbiology

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Phospholipids are made up of: 

A. a glycerol and three fatty acids. B. four fused carbon rings. C. a phosphate, two fatty acids and a glycerol. D. five-carbon rings with two nonpolar tails.

Biology & Microbiology

In the central nervous systems, axons of several neurons traveling together are called ____

a. nuclei b. fibers c. bundles d. tracts e. filaments

Biology & Microbiology

White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?

A) Mix the blood in a salty solution to cause the RBCs to lyse.
B) Mix the blood in an isotonic solution and allow the WBCs to float to the top.
C) Mix the blood in a hypotonic solution, which will cause the RBCs to lyse.
D) Mix the blood in a hypertonic solution, which will cause the RBCs to lyse.

Biology & Microbiology

The barbed (fast growing) end of actin filaments is located in muscle

a. at the AI junction. b. near the M line of a contracted sarcomere c. at the inner margin of the AI zone d. at the Z disc e. none of the above

Biology & Microbiology