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

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Question 7

Lysine is a basic amino acid with the structure H2N−CH(COOH)−(CH2)4NH2\text{H}_2\text{N}-\text{CH}(\text{COOH})-(\text{CH}_2)_4\text{NH}_2H2​N−CH(COOH)−(CH2​)4​NH2​ in its un-ionised form. Which is the main species present in an aqueous solution of lysine at pH=7.0\text{pH} = 7.0pH=7.0?

H3N+−CH(COO−)−(CH2)4NH2\text{H}_3\text{N}^+-\text{CH}(\text{COO}^-)-(\text{CH}_2)_4\text{NH}_2H3​N+−CH(COO−)−(CH2​)4​NH2​

H3N+−CH(COO−)−(CH2)4NH3+\text{H}_3\text{N}^+-\text{CH}(\text{COO}^-)-(\text{CH}_2)_4\text{NH}_3^+H3​N+−CH(COO−)−(CH2​)4​NH3+​

H3N+−CH(COOH)−(CH2)4NH3+\text{H}_3\text{N}^+-\text{CH}(\text{COOH})-(\text{CH}_2)_4\text{NH}_3^+H3​N+−CH(COOH)−(CH2​)4​NH3+​

H2N−CH(COO−)−(CH2)4NH2\text{H}_2\text{N}-\text{CH}(\text{COO}^-)-(\text{CH}_2)_4\text{NH}_2H2​N−CH(COO−)−(CH2​)4​NH2​

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

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