Natural killer cells prevent viral infection by
A) secreting proteins that punch holes in viral plasma membranes.
B) enzymatically destroying virus-infected cells.
C) phagocytizing cells that are infected with a virus.
D) ingesting the viruses and digesting them.
B
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Some drugs are now being delivered into cells through liposomes, where the drug is surrounded by a phospholipid bilayer. Explain how the drugs enter the cell
What will be an ideal response?
Which of these choices lists the categories of joints in order of decreasing allowable movement?
a. amphiarthroses, synarthroses, diarthroses b. synarthroses, amphiarthroses, diarthroses c. diarthroses, amphiarthroses, synarthroses d. diarthroses, synarthroses, amphiarthroses
An example of a boneless muscular organ is a(n) ____
a. urethra b. tendon c. ligament
d. tongue e. muscle fiber
What statement best describes “biology”?
a. The science of life b. The naming of organisms c. The study of natural selection
d. The measurement of populations e. The study of how organisms are related to one another