Multiple choice

Which of the following terms describes antibody correctly?

  1. Protein molecules which inactivates any foreign antigen.

  2. Proteins which attack the invading bacteria.

  3. Antibodies immobilizes bacteria.

  4. Antibody kills virus.
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A Correct answer
Explanation

Antibodies are Y-shaped protein molecules produced by plasma cells that specifically bind to and neutralize foreign antigens. While they can immobilize bacteria and kill viruses, these are specific functions, not the complete definition. The key characteristic is that they are proteins that inactivate any foreign antigen they encounter.

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