30 ! plz answer! which is the correct definition of antibodies? a. a preparation of dead or weakened pathogens that is injected into the body to cause the immune system to produce antibodies. b. proteins that attach to antigens, keeping them from harming the body. c. substances that send the immune system into action. d. special white blood cells in the lymph.\\

a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood

Explanation:

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

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explanation:

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