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

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Question 15

Which structure represents the predominant form of serine, H2N−CH(CH2OH)−COOH\text{H}_2\text{N}-\text{CH}(\text{CH}_2\text{OH})-\text{COOH}H2​N−CH(CH2​OH)−COOH, in an aqueous solution at pH=1\text{pH} = 1pH=1?

H2N−CH(CH2OH)−COO−\text{H}_2\text{N}-\text{CH}(\text{CH}_2\text{OH})-\text{COO}^-H2​N−CH(CH2​OH)−COO−

H3N+−CH(CH2OH)−COO−\text{H}_3\text{N}^+-\text{CH}(\text{CH}_2\text{OH})-\text{COO}^-H3​N+−CH(CH2​OH)−COO−

H3N+−CH(CH2OH)−COOH\text{H}_3\text{N}^+-\text{CH}(\text{CH}_2\text{OH})-\text{COOH}H3​N+−CH(CH2​OH)−COOH

H2N−CH(CH2OH)−COOH\text{H}_2\text{N}-\text{CH}(\text{CH}_2\text{OH})-\text{COOH}H2​N−CH(CH2​OH)−COOH

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

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