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Amino acids, proteins and DNA (A-level only)

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Question 9

Which structure represents the major species of aspartic acid (2-aminobutanedioic acid) present in a strongly alkaline solution at pH 12?

A
H3N+−CH−COO−∣CH2COOH \begin{array}{c} \text{H}_3\text{N}^+ - \text{CH} - \text{COO}^- \\ | \\ \text{CH}_2\text{COOH} \end{array} H3​N+−CH−COO−∣CH2​COOH​
B
H3N+−CH−COOH∣CH2COOH \begin{array}{c} \text{H}_3\text{N}^+ - \text{CH} - \text{COOH} \\ | \\ \text{CH}_2\text{COOH} \end{array} H3​N+−CH−COOH∣CH2​COOH​
C
H2N−CH−COO−∣CH2COO− \begin{array}{c} \text{H}_2\text{N} - \text{CH} - \text{COO}^- \\ | \\ \text{CH}_2\text{COO}^- \end{array} H2​N−CH−COO−∣CH2​COO−​
D
H3N+−CH−COO−∣CH2COO− \begin{array}{c} \text{H}_3\text{N}^+ - \text{CH} - \text{COO}^- \\ | \\ \text{CH}_2\text{COO}^- \end{array} H3​N+−CH−COO−∣CH2​COO−​
Markscheme

Amino acids, proteins and DNA (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Amino acids, proteins and DNA (A-level only)

30 exam-style questions on AQA A Level Chemistry Amino acids, proteins and DNA (A-level only), covering Amino acids (A-level only), Proteins (A-level only), Enzymes (A-level only), DNA (A-level only), and Action of anticancer drugs (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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