How many amino acids are present for a polypeptide chain to be called a protein?
A. 50
B. 3
C. 100
D. 30
Answer: C
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Which of the following is not secreted by helper T cells?
a. B-cell growth factor b. T-cell growth factor c. interleukin 1 d. interleukin 2 e. macrophage migration inhibition factor
Contraction of the ________ layers of the intestinal wall functions to both agitate materials and propel them along the digestive tract.
A) mucosa B) submucosa C) serosa D) muscularis externa E) adventitia
Which blood vessel drains deoxygenated blood from the portion of the body below the chest?
A. Subclavian vein B. Superior vena cava C. Inferior vena cavae D. Aorta
The viscosity of blood is ________ proportional to the number of erythrocytes and ________ proportional to the amount of fluid.
A. directly; indirectly B. indirectly; directly C. directly; directly D. indirectly; indirectly