21. Which of the following pairs of amino acids could form a charge-charge interaction through their R-
groups (side chains)?
(A) serine and glutamic acid
(B) glutamine and lysine
(C) methionine and histidine
(D) lysine and arginine
(E) aspartic acid and lysine
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1. 題目解析 此題目詢問哪些氨基酸的側...
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