5.4

Proteins Preform most functions in Cells:

• A protein is a polymer of just 2o kinds of monomers
• they are responsible for most day to day functioning organisms
• Proteins also defend the body from harmful microorganisms
• Amino acids are monomers with a central carbon bonded to 4 partners
• one partner must be a hydrogen atom 2 others are carboxyl group and the rest are amino groups
• the differences in amino acids are the side groups that attach to the fourth bond or the "R" group
• A polypeptide are amino acids linked in chains each link is made by the dehydration reaction
• the body can make many varieties of proteins
• Protein shape are precisely made and influenced by its surroundings
  
• during an unfavorable change in pH the protein will unravel, this is denaturation

Concept Check:
1.Give 2 examples of proteins you can see in the world around you, what are their functions?
Proteins make hair grow, and muscle is protein.
2.Relate amino acids, polypeptides and proteins.
Amino acids make up polypeptides and proteins
3. Explain how heat can destroy a protein.
Heat can make it unravel therefore destroying it
4.Which parts of an amino acid is the same in all amino acids? What is unique?
All have a hydrogen bond and a carboxyl group the rest is unique