The advantage of having memory cells in specific defenses is that
A) they remain in an active state, continuously producing antibodies.
B) if exposed to an antigen a second time, they quickly become plasma cells.
C) they prevent production of other proteins so that antibodies can be produced.
D) they produce antibodies and can become phagocytic.
E) they prevent viruses from entering the body a second time.
B
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Why do the functions of many receptor kinases depend on the fluid nature of the plasma membrane?
A. The generation of cAMP requires a fluid membrane. B. Binding of ligand to the receptor requires a fluid membrane. C. The receptor monomers must move together and dimerize to be activated. D. Phosphorylation requires a fluid membrane.
What is a common feature of most mollusk bodies?
a. dorsal mantle b. book lungs c. tube feet d. closed circulatory system
Which of these is the main function of the blood-brain barrier?
Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood Prevents any molecules from entering the cerebrospinal fluid from the blood Coordinates the nervous and endocrine systems by influencing the pituitary gland Filters sensory input and keeps the cerebral cortex in an alert state
The molecules formed by an enzyme-catalyzed reaction are called ________.
Fill in the blank(s) with the appropriate word(s).