HIV attaches to its target cell by binding to the
Correct answer: D. CD4 receptors on helper T lymphocytes
- A. antibodies on the cell surface
- B. MHC class one molecules
- C. antigen receptors of B lymphocytes
- D. CD4 receptors on helper T lymphocytes
Explanation
The viral glycoprotein gp120 fits the CD4 receptor, which is why helper T cells and macrophages, the CD4 bearing cells, are the targets. Destroying helper T cells collapses both arms of specific immunity, producing AIDS.
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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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