Biology 9700 · AS & A Level · Proteins

Proteins — practice question

The diagram shows an amino acid. R stands for a variable side chain. Which side chain is not possible?

  • A$\text{CH}_3$
  • B$\text{CH}_2\text{CH}_2\text{SCH}_3$
  • C$\text{CH}_2\text{CONH}_2$
  • D$\text{HOCH}_2\text{CH(OH)CH}_2\text{OH}$

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