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Exam is worth 205 points (including part 1). keto 1. Consider an ketheptose. Which carbon would contain the carbonyl carbon? 2. Are there any amino acids that have a charge of +2 at a pH of 1? What type of amino acid would they have to be? (Hint: think of what type of group after losing a proton would have a negative charge). Draw one in the space below (you can use the Fisher projection template provided, or bold and dashed lines). What type of amino acid is it? Draw the correct structure of leucine at a pH of 13. You may use the Fisher projection template provided, or use bold and dashed lines 3. 1
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Answer #1

1. In ketohexose, second carbon contains the keto group.

2. At pH=1 basic amino acids are shown +2 charge. Amino acids are in the form of zwitterionic at pH=7, at lower pH amine group in the form of NH3+ and the carboxy group as COOH. At higher pH Amino gorup as NH2 and COOH group as COO-

The answer is Lysine, arginine, Histidine.

3. Leucine at pH=13 having COOH as COO-

find the structure below image.

2 C00 μ Co 0H cooH 3 H chasge + 2 Chog + A13inine Chane: t2 hi省dine Co 0 H,N Leudine

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