11. The essential amino acids (A) must be obtained from the food we eat. (B) are found only in green, leafy vegetables. (C) are essential as an energy source. (D) are required for making nucleic acids.

11. The essential amino acids
(A) must be obtained from the food we eat.
(B) are found only in green, leafy vegetables.
(C) are essential as an energy source.
(D) are required for making nucleic acids.

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B1 · 2025/09/15

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10. Arrange in the correct sequence these components of the mammalian immune system as it first responds to a pathogen. I. Pathogen is destroyed. II. Lymphocytes secrete antibodies. III. Antigens from the pathogen bind to receptors on lymphocytes. IV. Lymphocytes specific to antigens from the pathogen become numerous. V. Only memory cells remain. (A) I → III → II → IV → V (B) III → II → I → V → IV (C) III → I → IV → II → V (D) IV → II → III → I → V (E) III → IV → II → I → V

11. The essential amino acids (A) must be obtained from the food we eat. (B) are found only in green, leafy vegetables. (C) are essential as an energy source. (D) are required for making nucleic acids.

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11. The essential amino acids
(A) must be obtained from the food we eat.
(B) are found only in green, leafy vegetables.
(C) are essential as an energy source.
(D) are required for making nucleic acids.