Q93 / 200 · NEET 2002 · Chemistry

Which of the following statement(s) is incorrect?

  • A
    $\alpha$-carbon of $\alpha$-amino acid is asymmetric
  • Correct answer
    B
    All proteins are found in the L-form
  • C
    Human body can synthesize all proteins they need
  • D
    At $\mathrm{pH}=7$ both amino and carboxylic groups exist in the ionized form

Solution

Amino acids are organic compounds that contain amine \(\left(-\mathrm{NH}_2\right)\) and carboxyl \((-\mathrm{COOH})\) functional groups, along with a side chain (R group) specific to each amino acid. a-carbon of cc-amino acid is asymmetric. Hence this statement is true. Proteins exist in both D and L -form. Human body can synthesize all proteins they need. At \(\mathrm{pH}=7\), both amino and carboxylic groups exist in ionised form.

Hence, the correct answer is option: 'B'.

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