Which of the Following Is True of Antigens in the Blood

question 43

Multiple Choice

Which of the following is true of antigens in the blood?

• A) They are small molecules that are capable of suppressing the immune system.
• B) They are enzymes within the body that attack invading organisms.
• C) They are the chemical barriers that surround uninfected cells.
• D) They react with the antibodies that are released to fight them.

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