Multiple choice

Which of the following statements is/are correct?

  1. Both L-amino acids and D-amino acids occur in nature.
  2. Only D-alpha-amino acids are present in proteins.
  3. All amino acids possess at least two weakly acidic functional groups, R-NH3+ and R-COOH.
  4. Amino acids do not possess any type of additional weakly acidic functional groups.

  1. None of these

  2. Only 1

  3. Only 3

  4. Only 2 and 4

  5. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All amino acids possess at least two weakly acidic functional groups, R-NH3+ and R-COOH.

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