Which is NOT true about amino acids?
Correct answer: D. They do not exist in solid state
- A. They have two functional groups
- B. They show both acidic and basic characteristics
- C. They are the basic units of proteins
- D. They do not exist in solid state
Explanation
Amino acids exist as zwitterions, which are molecules that have both positive and negative charges but are overall neutral. This zwitterionic form is stable and contributes to strong intermolecular interactions, allowing amino acids to exist in a solid state at room temperature. Option D is incorrect because amino acids do exist in solid state. Option A is true because the amino and carboxyl groups are the two functional groups present in amino acids. Option B is true as amino acids can exhibit both acidic and basic properties. Option C is correct as amino acids are indeed the basic units of proteins.
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About Importance of Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their biological roles depend on primary, secondary, tertiary and quaternary structure. Coverage includes enzymes, hormones, antibodies, transport proteins, muscle fibres and structural tissues, together with denaturation and the effects of heat, pH and chemicals.
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