21. The primary purpose of the passage is to
discuss viral mechanisms and possible ways of circumventing certain kinds of those mechanisms
challenge recent research on how rhinoviruses bind to receptors on the surfaces of cells
suggest future research on rhinoviral growth in chimpanzees
defend a controversial research program whose purpose is to discover the molecular structure of rhinovirus capsids
evaluate a dispute between advocates of two theories about the rhinovirus life cycle
22. It can be inferred from the passage that the protein sequences of the capsid that vary most among strains of rhinovirus are those
at the base of the canyon
outside of the canyon
responsible for producing nucleic acid
responsible for preventing the formation of delta-receptors
preventing the capsid from releasing its nucleic acid
23. It can be inferred from the passage that a cell lacking delta-receptors will be
unable to prevent the rhinoviral nucleic acid from shedding its capsid
defenseless against most strains of rhinovirus
unable to release the viral progeny it develops after infection
protected from new infections by antibodies to the rhinovirus
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