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

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Question 22

Which structure is predominant when glutamic acid is in an aqueous solution at pH 7\text{pH } 7pH 7?

A
H3N+ ⁣ ⁣−CH− ⁣COO−∣CH2CH2COOH \begin{array}{rcc} \text{H}_3\text{N}^+ \! & \! -\text{CH}- & \! \text{COO}^- \\ & | & \\ & \text{CH}_2\text{CH}_2\text{COOH} & \end{array} H3​N+​−CH−∣CH2​CH2​COOH​COO−​
B
H2N ⁣ ⁣−CH− ⁣COO−∣CH2CH2COO− \begin{array}{rcc} \text{H}_2\text{N} \! & \! -\text{CH}- & \! \text{COO}^- \\ & | & \\ & \text{CH}_2\text{CH}_2\text{COO}^- & \end{array} H2​N​−CH−∣CH2​CH2​COO−​COO−​
C
H3N+ ⁣ ⁣−CH− ⁣COO−∣CH2CH2COO− \begin{array}{rcc} \text{H}_3\text{N}^+ \! & \! -\text{CH}- & \! \text{COO}^- \\ & | & \\ & \text{CH}_2\text{CH}_2\text{COO}^- & \end{array} H3​N+​−CH−∣CH2​CH2​COO−​COO−​
D
H3N+ ⁣ ⁣−CH− ⁣COOH∣CH2CH2COOH \begin{array}{rcc} \text{H}_3\text{N}^+ \! & \! -\text{CH}- & \! \text{COOH} \\ & | & \\ & \text{CH}_2\text{CH}_2\text{COOH} & \end{array} H3​N+​−CH−∣CH2​CH2​COOH​COOH​
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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