Question

a photograph of a virus is shown below.

the projections on the surface of this virus allow the virus to -
a. move inside a host cell
b. attach to a host cell
c. control a host cell’s dna
d. signal other viruses to infect a host cell

cold sores are caused by the herpes simplex virus type 1. a company that wants to develop antiviral drugs would ask a research immunologist to study -
a. the mechanism used by the virus to infect cells
b. how closely related the virus is to cold viruses
c. the metabolism of the virus
d. meiosis in the virus

Explanation:

1. Virus surface projections (spikes) bind to host cell receptors, enabling attachment—the first step of infection.
2. Antiviral drugs target infection mechanisms; understanding how the virus infects cells is key for drug development. Viruses lack metabolism/meiosis, and relatedness to cold viruses is irrelevant to drug action.

Answer:

1. B. attach to a host cell
2. A. the mechanism used by the virus to infect cells