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

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Question 17

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

A

H3N+−CH(COOH)−CH2CH2COOH\text{H}_3\text{N}^+-\text{CH}(\text{COOH})-\text{CH}_2\text{CH}_2\text{COOH}H3​N+−CH(COOH)−CH2​CH2​COOH

B

H3N+−CH(COO−)−CH2CH2COOH\text{H}_3\text{N}^+-\text{CH}(\text{COO}^-)-\text{CH}_2\text{CH}_2\text{COOH}H3​N+−CH(COO−)−CH2​CH2​COOH

C

H2N−CH(COOH)−CH2CH2COOH\text{H}_2\text{N}-\text{CH}(\text{COOH})-\text{CH}_2\text{CH}_2\text{COOH}H2​N−CH(COOH)−CH2​CH2​COOH

D

H2N−CH(COO−)−CH2CH2COO−\text{H}_2\text{N}-\text{CH}(\text{COO}^-)-\text{CH}_2\text{CH}_2\text{COO}^-H2​N−CH(COO−)−CH2​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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