Proteins Flashcards
1
Q
Classes of amino acids
A
Aliphatic (usually linear, hydrocarbon R groups) Aromatic Sulphur containing Basic (+ve charge) Acidic (-ve charge) Uncharged polar (hydrophilic) Other
2
Q
Primary stucture
A
Sequence of amino acids in a polypeptide chain
3
Q
Secondary structure
A
Spatial arrangement of amino acids that are near each other in the linear sequence
Alpha helix, beta-pleated sheet
4
Q
Tertiary structure
A
Spatial arrangement of amino acid sequences that are far apart in a linear sequence (weak interactions)
5
Q
Quaternary structure
A
Spatial arrangement of individual polypeptide chains in a multisubunit protein
6
Q
Cooperativity
A
Binding at one site on the protein alters affinity at the other points
7
Q
Globular proteins
A
Varied functions => Enzymes Messengers (hormones) Stock of amino acid Transporters Structural function (eg. actin and tubulin)
8
Q
Fibrous proteins
A
Structural functions => Bone matrices Muscle fibre Tendons Connective tissue
