Cytokines that act by interfering with the multiplication of viruses within cells are __________.
A. interferon
B. interleukins
C. monokines
D. tumor necrosis factors
Question 2
An organ system is composed of:
A. three distinct layers called germ layers.
B. connective and supporting tissues.
C. a group of organs organized to perform complementary functions.
D. muscle and nerve tissues.