Macronutrients - Proteins Flashcards
what elements do proteins contain?
carbon, hydrogen, oxygen but also nitrogen and sometimes sulphur and phosphorus
how many amino acids are in a human?
about 20
what are polymers before they are proteins?
polypeptides
what are fibrous proteins?
structural proteins eg collagen
what are some properties of fibrous proteins?
insoluble in water, strong and tough
how many polypeptide chains does a single fibre consist of?
3 polypeptide chains
what are globular proteins?
metabolic functions eg haemoglobin
what are some examples of globular proteins?
- enzymes, antibodies, hormones eg insulin
what is the shape of globular proteins?
compact and foldedinto 3D spherical molecules
state four differences between haemoglobin and collagen
- h has 4 polypeptide molecules, c has 3
- h - eahc polypeptide is diff, c - each is same
- h associated with non-protein groups, c not associated with non-protein groups
- h quaternary, c secondary
what are the contents in an amino acid?
amino group, r-group (varient), carboxyl group
what do the different r groups do?
make different amino acids
what is the protein bond?
peptide bond
what are the four levels of proteins?
- primary structure
- secondary structure
- tertiary structure
- quaternary structure
what is the primary structure?
the sequence of amino acids in a polypeptide chain (triplet code)
