Colds are common because
A. of the antigenic diversity of the rhinoviruses and the lack of long-lasting immunity.
B. domestic animals serve as a persistent reservoir.
C. there is a lack of effective antiviral drugs.
D. immunity once obtained is not protective.
Answer: A
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Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the ?-globin gene?
A. silent B. missense C. nonsense D. frameshift E. sense
The ________ is connected to the GI tract and has no digestive function, but it may have a role in the defense of the body against disease. It occasionally becomes inflamed and requires removal
Fill in the blank(s) with correct word
What is the role of the epithelium?
A) Helps protect the body from the external environment B) Transmits electrical signals throughout the body C) Contracts to create body movement D) Provides the padding between the joints
Protein kinases are enzymes that transfer the terminal phosphate from ATP to an amino acid residue on the target protein. Many are located on the plasma membrane as integral membrane proteins or peripheral membrane proteins
What purpose may be served by their plasma membrane localization? A) ATP is more abundant near the plasma membrane. B) They can more readily encounter and phosphorylate other membrane proteins. C) Membrane localization lowers the activation energy of the phosphorylation reaction. D) They flip back and forth across the membrane to access target proteins on either side.