Lymph nodes are a place where cells of the immune system accumulate and share information.
a. true
b. false
Answer: a. true
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The ________ lactose is often used as a substrate for penicillin production.
A. disaccharide B. trisaccharide C. more complex molecule D. monosaccharide
The action of a white blood cell engulfing a
bacterium is a. pinocytosis. b. phagocytosis. c. exocytosis. d. endocytosis. e. phagocytosis and endocytosis.
Certain nutrients are considered "essential" in the diets of some animals because _____
A) only those animals use those nutrients B) these animals are not able to synthesize these nutrients C) the nutrients are necessary coenzymes D) only certain foods contain them
What encourages flooding by allowing water to run off into streams?
A. Acid rain B. Deforestation C. Desertification D. Bioaccumulation E. Biological magnification