Ribosomes are a supramolecular complex of ribosomal RNA and multiple protein subunits. This therefore represents an example of:

Amino acids can be classified into different physiochemical groups due to differences in their:

How many peptide bonds are there in the following peptide sequence?

ValValGlyProAsnAspHisSer

(Enter a number in digits with no additional characters)

What amino acid(s) are very likely to be buried within a globular protein found in the cytoplasm?

DNA polymerase, the enzyme responsible for replicating DNA, contains different catalytic subunits that adopt discrete structures. This an example of: 

Dihedral angles are important in the secondary structure of proteins. Two types of dihedral angles have the greatest impact on peptide conformation, with these derived from rotation around:

(Note that the main-chain atoms of an amino acid backbone are here denoted N–Cα–C)

Fibrous proteins often have functions related to:

The image below is a helical wheel representation of part of an alpha helix (top-down view), with each amino acid a numbered circle.

Without knowledge of any R groups, non-covalent interactions between which ONE of the following pairs of amino acids will likely help stabilise the helix?

Why is cysteine (shown below) able to form disulphide bonds?

The image below shows aspects of the secondary structure of an important human protein.

Several amino acids are highlighted by a ball and stick representation.

(Note that atoms are coloured by element, where blue is nitrogen and red is oxygen.)

Which statement below describes the numbered region?