Structural organisation of proteins

All proteins have the same sequence of amino acids.

Proteins are made up of only 20 different amino acids.

The function of a protein does not depend on its structure.

Proteins do not have a unique 3D structure.

The sequence of amino acids in a polypeptide chain

The folding of the polypeptide chain into alpha helices and beta sheets

The overall three-dimensional shape of a single polypeptide chain

The arrangement of multiple polypeptide subunits

They hold amino acids together in a polypeptide chain

They stabilize the tertiary structure

They form hydrogen bonds between chains

They link multiple polypeptide subunits

It consists of two peptides with 21 and 30 amino acids

It contains two inter-chain disulfide bonds

It contains one intra-chain disulfide bond

It is stabilized by hydrogen bonds

α-helix and β-pleated sheets

Triple helix and β-bend

α-helix and triple helix

β-turn and β-pleated sheets

Right-handed spiral

Stabilized by hydrogen bonds

Side chains extend inward

Formed by twisting the polypeptide backbone

Glycine and proline

Alanine and leucine

Serine and threonine

Valine and isoleucine

The direction of the N- and C-terminals in the polypeptide chains

The number of polypeptide chains involved

The presence of hydrogen bonds

The type of amino acids present

Peptide bonds

Hydrogen bonds

Disulfide bonds

Van der Waals forces

It involves multiple polypeptide chains.

It is found in all proteins.

Subunits may be structurally identical or unrelated.

It is stabilized only by covalent bonds.

Ionic interactions

Peptide bonds

Phosphodiester bonds

Glycosidic bonds