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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?

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−​
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−​
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−​
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​

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

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