Replace the third fatty acid in fat with a phosphate group. Linking several amino acids together with peptide bonds. The type of amino acid in a particular protein has changed

What happens in each of the following cases:
Replace the third fatty acid in fat with a phosphate group.
- Turn into phospholipids.
2 - the association of several amino acids together peptide links.
- Produces polypeptide series.
Change the type of amino acid in a particular protein.
- Boom changes and protein properties.