Amino acids from drawn structures: side chain, chirality, charge

14 questions on Amino acids from drawn structures: side chain, chirality, charge from the Biomolecules chapter: 4 NEET level, 5 JEE Main, 5 JEE Advanced. Each one opens with its answer and solution.

• The side chain of the amino acid shown is best classified as NEET level, drawn structure
• How many stereocentres does the amino acid shown have? NEET level, drawn structure
• The side chain of the amino acid shown is classified as NEET level, drawn structure
• At its isoelectric point the amino acid shown exists mainly as a zwitterion. Which of Structures A to D represents this form? NEET level, drawn structure
• The amino acid shown has which configuration, written as D/L and as R/S at its stereocentre? JEE Main level, drawn structure
• The amino acid shown is classified, by side chain and dietary requirement, as JEE Main level, drawn structure
• For the amino acid shown, pK_a1 (COOH) = 2.34 and pK_a2 (NH3+) = 9.69. Which of Structures A to D is the predominant species at pH 12? JEE Main level, drawn structure
• The amino acid shown has pK_a1 = 2.34 and pK_a2 = 9.60. What is its isoelectric point? JEE Main level, drawn structure
• The reference amino acid shown is non-essential in humans. Which of Structures A to D is an essential amino acid? JEE Main level, drawn structure
• The amino acid shown has three ionisable groups with pK_a values 2.18 (COOH), 8.95 (alpha-NH3+) and 10.53 (side-chain NH3+). Take the predominant species at pH ... JEE Advanced level, drawn structure
• The amino acid shown has pK_a values 2.10 (alpha-COOH), 3.90 (side-chain COOH) and 9.80 (alpha-NH3+). What is its isoelectric point? JEE Advanced level, drawn structure
• For the amino acid shown, pK_a values are 1.82 (COOH), 6.00 (side chain) and 9.17 (alpha-NH3+). Which of the following is/are correct? JEE Advanced level, drawn structure
• Which of the following statements about the amino acid shown is/are correct? JEE Advanced level, drawn structure
• The amino acid shown has pK_a1 = 2.21 and pK_a2 = 9.15. Which of Structures A to D is the predominant form, with the same configuration at the stereocentre, in ... JEE Advanced level, drawn structure