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.
Identify the level of protein structure shown.
Draw a structure for the -Gly-Ser-\text{-Gly-Ser-}-Gly-Ser- section of the protein, showing the peptide linkage.
State the type of chemical reaction that joins two amino acids together during the formation of a protein chain.
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.
Deduce the type of interaction that occurs between a serine R group and a threonine R group.
30 exam-style questions on AQA A Level Chemistry Amino acids, proteins and DNA (A-level only), covering Amino acids (A-level only), Proteins (A-level only), Enzymes (A-level only), DNA (A-level only), and Action of anticancer drugs (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.