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

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Question 8

Proteins are polymers made from amino acids. Part of the structure of a protein is shown below:

-Gly-Ser-Cys-Val- \text{-Gly-Ser-Cys-Val-} -Gly-Ser-Cys-Val-

Each amino acid in the sequence is shown using the first three letters of its name.

1.

Identify the level of protein structure shown.

[1]
2.

Draw a structure for the -Gly-Ser-\text{-Gly-Ser-}-Gly-Ser- section of the protein, showing the peptide linkage.

[2]
3.

State the type of chemical reaction that joins two amino acids together during the formation of a protein chain.

[1]
4.

Explain why the strength of the interaction between two cysteine R groups differs from the strength of the interaction between a valine R group and a leucine R group.

[4]
5.

Deduce the type of interaction that occurs between a serine R group and a threonine R group.

[1]

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

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