5. If laboratory samples are not handled properly, they may become ______ and give inaccurate results. (A) purified (B) isolated (C) sterilized (D) contaminated

11. The vaccine uses a conjugate protein, in which a polysaccharide antigen is covalently attached to a protein carrier, to enhance the immune response. What does conjugate most nearly mean here? (A) Fragmented into smaller components (B) Chemically linked to another molecule (C) Attenuated to reduce pathogenicity (D) Purified from other components

5. If laboratory samples are not handled properly, they may become ______ and give inaccurate results.

(A) purified

(B) isolated

(C) sterilized

(D) contaminated

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