What is the difference between humoral and cellular adaptive immunity?

What is the difference between an antigen and a hapten?

Describe the mechanism of antibody-dependent cell-mediated cytotoxicity.

What is the basic difference in effector function between helper and cytotoxic T cells?

What necessary interactions are required for activation of helper T cells and activation/effector function of cytotoxic T cells?

Briefly compare the pros and cons of inactivated versus live attenuated vaccines.