The action of a white blood cell engulfing a bacterium is known as ____.
A. pinocytosis only
B. phagocytosis only
C. exocytosis and phagocytosis
D. endocytosis and pinocytosis
E. phagocytosis and endocytosis
Answer: E
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What would you predict would happen in an area of the body where PO2 is relatively low?
a. O2 would bind more readily to hemoglobin b. CO2 would bind more readily to hemoglobin c. O2 would release from hemoglobin d. CO2 would release from hemoglobin e. binding of O2 by hemoglobin would cease
What happens to population size (N) if there is no constraint on growth?
a. The population will quickly level out and maintain an equilibrium. b. The population will grow continuously at the same rate. c. The population will grow continuously at an ever-increasing rate. d. The population will decline.
Which of the following describes the blood-brain barrier?
A) It is part of the immune system that involves the release of antibodies to protect the brain from infectious agents B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain C) It is a property of blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters in to the blood circulation
Which of the following elements, essential to life, is a trace element?
A) phosphorus B) carbon C) iodine D) calcium