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The adaptive immune system is activated by administering the weakened part of the infective pathogen. It stimulates the body鈥檚 immune system and prepares specific antibodies against the pathogen.

The small fragments of specific antigens which do not cause infection in the host body are components of the vaccine.

The vaccine plays a significant role in influencing the receptors of the adaptive immune system but not the receptors of the non-specific or innate immune system.

Therefore, not all the receptors are activated by a vaccine.

Thus, the given statement is false.

Lymphocytes are parts of the adaptive immune system. T cell receptors participate in the recognition of pathogens, and B cells produce antibodies against the pathogen. Hence, vaccines increase the number of lymphocytes to take action against the disease-causing invaders.

Therefore, the vaccine helps to activate the lymphocytes to develop memory.

Thus, the given statement is true.

Epitopes are present in antigens. These are recognized by the immune cells of the body.

Therefore, the vaccine does not increase the epitopes in the host body.

Thus, the given statement is false.

MHC molecules are present on the cell surface. They encode proteins that help to recognize the foreign substance and also for self-recognition. The genome encodes the formation of MHC on the cell surface through gene regulation. Vaccine acts only at the cellular level, and they do influence genes.

Therefore, vaccines do not increase the MHC molecules.

Thus, the given statement is false.