Humoral Immunity

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

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

Q.

Which one of the following is mediates humoral immunity?

1. T-lymphocyte

2. B-lymphocyte

3. I-lymphocyte

4. P-lymphocyte