4. What is the overall net charge on the peptide Arg-Ala-Ile-Lys-Glu-Tyr-Asp at pH 7.0? (A) +2, (B) +1, (C) -2, (D) 0, (E) -1.

4. What is the overall net charge on the peptide Arg-Ala-Ile-Lys-Glu-Tyr-Asp at pH 7.0?
(A) +2,
(B) +1,
(C) -2,
(D) 0,
(E) -1.

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B1 · 2025/09/29

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1. 題目解析這道題目要求計算在 pH...

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8. All of the following statements about cyclic sugars are true EXCEPT: (A) The a-anomer has the -OH of the anomeric carbon positioned on the same side of the sugar ring from the -CH2OH, (B) The five and six membered rings are more frequently observed due to stability, (C) In a chair conformation, the predominant form has the bulkiest substituents occupying equatorial positions, (D) The carbonyl carbon becomes a chiral center, (E) They can be formed by the intramolecular reactions to hemiacetals or hemiketals.

4. What is the overall net charge on the peptide Arg-Ala-Ile-Lys-Glu-Tyr-Asp at pH 7.0?
(A) +2,
(B) +1,
(C) -2,
(D) 0,
(E) -1.

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