The envelope glycoprotein gp120 of HIV is important because it
Correct answer: C. binds to receptors on host cells and allows the virus to enter
- A. makes vaccination unnecessary
- B. destroys the host's red blood cells
- C. binds to receptors on host cells and allows the virus to enter
- D. makes the virus resistant to heat
Explanation
gp120 projects from the envelope and locks onto CD4 receptors, the first step of infection, which is why it is also the main target researchers aim antibodies at. It has no role against heat or red cells.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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