• Want to help us with this year's BoS Trials?
    Let us know before 30 June. See this thread for details
  • Looking for HSC notes and resources?
    Check out our Notes & Resources page

proteins & polypeptides (1 Viewer)

MiSSi

Member
Joined
Sep 9, 2003
Messages
209
Location
Sydney
hey i cant find this anywhere!
explain the relationship between proteins and polypeptides. thanks
 

xiao1985

Active Member
Joined
Jun 14, 2003
Messages
5,704
Gender
Male
HSC
N/A
polypeptide is just more than 1 amino acid joint together...... while protein is a definite sequence of specific amino acids joint together....... hence, a protein is a polypeptide but a polypeptide is not necessary a protein.......

an analogy would be: an amino acid is a letter, a polypeptide can be just some random letters while a protein is sort of like a word......

uhm, dont use that analogy in exam, cuz... i dunt fink the hsc mark would accept it..... :p
 

jims

Member
Joined
Jul 8, 2003
Messages
127
Location
Sydney
Gender
Male
HSC
2003
maybe thats right n im wrong but isnt a polypetide chain a sequence of amino acids? so the gene codes for a polypeptide, which may be a protein. however, some proteins are made up of several polypeptide chains. i can think of haemoglobin which has 4 polypetide chains. so basically, proteins are made up of polypetide chains which are made up of amino acids.
 

ballerinabarbie

bundy for me
Joined
Mar 21, 2003
Messages
719
Location
Somewhere in NSW... who knows?
Gender
Female
HSC
2003
Originally posted by jims
maybe thats right n im wrong but isnt a polypetide chain a sequence of amino acids? so the gene codes for a polypeptide, which may be a protein. however, some proteins are made up of several polypeptide chains. i can think of haemoglobin which has 4 polypetide chains. so basically, proteins are made up of polypetide chains which are made up of amino acids.
you are right...
 

iambored

dum-di-dum
Joined
Apr 27, 2003
Messages
10,862
Location
here
Gender
Undisclosed
HSC
2003
from a chem perspective..
i understand it by that amino acids join, to make polypeptides. when you have over i think it was 200/400 it can be classed as a protein. although, jims, i didn't know the bit about several chains, thanks for that
 

arls

Member
Joined
Oct 8, 2003
Messages
262
amino acids are linked by peptide bonds to make polypeptides. Several polypeptides linked together = protein.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top