The term internal salt refers to_____________________?
Correct answer: C. Dipolar character of amino acids
- A. Acidic character of amino acids
- B. Basic character of amino acids
- C. Dipolar character of amino acids
- D. Non-polar structure of amino acids
Explanation
An amino acid can exist as an internal salt or zwitterion, with a positively charged amino group, NH3+, and a negatively charged carboxylate group, COO−, in the same molecule. This gives amino acids a dipolar character, so option C is correct. Students may choose acidic or basic character by focusing on only one functional group and ignoring the simultaneous internal positive and negative charges.
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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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