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

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Question 8

Which is the main glutamic acid species present in an aqueous solution at pH=1\text{pH} = 1pH=1?

A
CH2CH2COOH∣H−C−NH3+∣COOH \begin{array}{c} \text{CH}_2\text{CH}_2\text{COOH} \\ | \\ \text{H}-\text{C}-\text{NH}_3^+ \\ | \\ \text{COOH} \end{array} CH2​CH2​COOH∣H−C−NH3+​∣COOH​
B
CH2CH2COOH∣H−C−NH2∣COOH \begin{array}{c} \text{CH}_2\text{CH}_2\text{COOH} \\ | \\ \text{H}-\text{C}-\text{NH}_2 \\ | \\ \text{COOH} \end{array} CH2​CH2​COOH∣H−C−NH2​∣COOH​
C
CH2CH2COO−∣H−C−NH3+∣COO− \begin{array}{c} \text{CH}_2\text{CH}_2\text{COO}^- \\ | \\ \text{H}-\text{C}-\text{NH}_3^+ \\ | \\ \text{COO}^- \end{array} CH2​CH2​COO−∣H−C−NH3+​∣COO−​
D
CH2CH2COO−∣H−C−NH2∣COO− \begin{array}{c} \text{CH}_2\text{CH}_2\text{COO}^- \\ | \\ \text{H}-\text{C}-\text{NH}_2 \\ | \\ \text{COO}^- \end{array} CH2​CH2​COO−∣H−C−NH2​∣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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