Practise IB Biology HL B1.2 with questions that move from amino-acid and peptide-bond diagrams to protein folding, interactions, denaturation and structure–function reasoning.
Some of the twenty amino acids that are linked together to make polypeptides in human cells are essential in the diet and others are not. Distinguish between essential and non-essential amino acids.
The molecules of all amino acids include an amine group, a carboxyl group and an R-group. Draw a diagram to show the structure of an amino acid molecule.
The R-groups of amino acids are very diverse chemically. Interaction between R-groups in different parts of a polypeptide helps to determine the tertiary structure of a protein. List two types of interaction between R-groups.
Label a peptide bond in the diagram of a polypeptide.
Outline the primary structure of proteins.
