The influenza virus is typical of many animal viruses in that is has an envelope composed of lipids and glycoproteins. Which of the following statements about the envelope is ACCURATE?
A. The envelope glycoproteins are encoded by genes found in the host genome.
B. The envelope is inside the capsid.
C. The envelope is obtained from the host cell when the virus buds from the plasma membrane.
D. The envelope is obtained from the host cell upon entry into the cell.
E. The envelope is formed via the action of integrase.
C. The envelope is obtained from the host cell when the virus buds from the plasma membrane.
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Protein disulfide isomerase:
A. reduces disulfide bonds. B. facilitates posttranslational modification of a protein. C. catalyzes the breakage and formation of disulfide bonds. D. reduces disulfide bonds and facilitates posttranslational modification of a protein. E. reduces disulfide bonds, facilitates posttranslational modification of a protein, and catalyzes the breakage and formation of disulfide bonds.
Substance E is made in the pancreas, travels through the blood, and binds to a surface receptor on a target cell. After
dimerization and autophosphorylation, the receptor activates a signaling protein. Substance E is therefore the ligand for ____.
a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase
Which type of white blood cells produces defensive proteins called antibodies?
A. Natural killer cells B. B cells C. Phagocytic cells D. T cells
What is the role of the villi in the small intestine?
A) To absorb small nutrient molecules from the digestive tract B) To move food along the digestive tract C) To secrete digestive enzymes into the digestive tract D) To secrete water into the digestive tract