proteins Flashcards
what is the monomer of a protein?
amino acids
what is a dipeptide?
2 amino acids joined together
what is a protein?
one or more polypeptides
what is a polypeptide?
more than 2 amino acids joined together
what is the structure of an amino acid?
amino group (H2N)
hydrogen
variable group (R)
carboxyl group (COOH)
carbon in centre
what is the primary structure of a protein?
sequence of amino acids
what is the secondary structure of a protein?
hydrogen bonds form between amino acids so they coil to an alpha helix r fold to a beta pleated sheet
what is the tertiary structure of a protein?
coils or fold further
hydrogen and ionic bonds form
disulfide bridges form
what is the quaternary structure of a protein?
how multiple polypeptide chains are assembled together
what is the biuret test?
add sodium hydroxide solution
add copper sulfate solution
positive = purple