Question

Vaccines are ______.

Options

• treated bacteria or viruses or one of their proteins

• MHC proteins

• the same as monoclonal antibodies

• all of the above

Answer 1

Vaccines are treated bacteria or viruses or one of their proteins.

Explanation:

• Vaccines are made from weakened or killed bacteria/viruses or one of their surface proteins (antigens).
• They help the body develop immunity by stimulating the production of antibodies.
• MHC proteins and monoclonal antibodies are not vaccines; they have different roles in the immune system.