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Which one of the following statements is correct with respect to immunity?

1. Preformed antibodies need to be injected to treat the bite by a viper snake.
2. The antibodies against smallpox pathogen are produced by T-lymphocytes.
3. Antibodies are protein molecules, each of which has four light chains.
4. Rejection of a kidney graft is the function of B-lymphocytes.

Correct answer: Preformed antibodies need to be injected to treat the bite by a viper snake.

Solution

A viper bite is treated with antivenom, which contains preformed antibodies that neutralize the venom immediately. This is passive immunity; the other options incorrectly assign antibody production, antibody structure, or graft rejection to the wrong cells.

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