In the formation of Zwitter ions proton goes from____________________?
Correct answer: A. Carboxyl to amino group
- A. Carboxyl to amino group
- B. Amino to carboxyl group
- C. Amino group only
- D. Carboxyl group only
Explanation
A zwitterion forms when the acidic carboxyl group transfers its proton to the basic amino group, producing -COO- and -NH3+ in the same molecule. The molecule then has both a negative and a positive charge but may have an overall neutral charge. The likely mistake is choosing amino to carboxyl because amino groups are basic, but in this internal transfer the carboxyl group supplies the proton.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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