When you scrape your skin, white blood cells arrive to fight infection. To slow down near the site of the cut, they use selectin, which provides traction. Since selectin helps white blood cells bind to a surface, they are part of a protein group known as
A. cellular adhesion molecules.
B. cellular binding molecules.
C. receptors.
D. integral proteins.
Answer: A
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Proteins are manufactured in mitochondria.
Answer the following statement true (T) or false (F)
One of the ways in which neurotransmitter is removed from the synaptic cleft is
A. endocytosis by the postsynaptic cell. B. reuptake by the presynaptic cell. C. phagocytosis by a macrophage. D. dendritic lassos.
Amphoteric molecules are molecules that can ______.
A. act as either an acid or a base B. stimulate water conservation C. stimulate the reabsorption of sodium D. stimulate the excretion of hydrogen ions
Which of the following is a characteristic of innate immunity?
a. It develops after exposure to an antigen. b. It is present from birth. c. Protection is delayed until antibodies are formed. d. It uses the process of inflammation to destroy foreign particles.