Concept Check 5.4 (:

THE FUNCTIONS OF PROTEINS
- A PROTEIN is a polymer constructed from a set of just 20 kinds of monomers called amino acids
-proteins are responsible to day to day functioning of organisms
-proteins form structures such as hair, fur and make up muscles and provide long term nutrients storage
-proteins work in bloods, defending harmful substances, conveys messages from one cell to another, controls chemical reactions.








AMINO ACIDS
-Each AMINO ACID monomer consists of a central carbon atom bonded into four partners
-Three partners are the same in all amino acids
-One partner is a hydrogen acid
- the side group differs in each amino acid
-side group is responsible for properties of each amino acid such as if its is hydroxyl









BUILDING A PROTEIN
- Cell create proteins by linking amino acids together into a chain called POPYPEPTIDE
-Each link is created by a dehyrdation reaction between amino group of one amino acid and the carboxyl group of the next amino acid
-can arrange amino acids in different orders to make proteins

PROTEIN SHAPE
- a functional protein consists of one or more polypeptides precisely twisted, folded and coiled into a unique shape
-a protein's shape is also influenced by surrounding environment, generally water
-an unfavorable change in temperature, pH or some other quality of the environment can cause a protein to unravel and lose its shape.
-called DENATURATION
-like frying an egg is denaturation

DENATURATION

Concept Check:

1. Give at least two examples of proteins you can see in the world around you. What are their functions?
Fish is a type of protein and it function as a nutrient. An egg is also a protein you can see in real life
2. Relate amino acids, polypeptides, and proteins.
They are all made up of amino acids as amino acids are the basis of polypeptides and proteins. The structure is with amino acids linking together at the bottom to make polypeptides. Proteins are created by the chain of polypeptides with protein as a final product.
3. Explain how heat can destroy a protein.
Heat can destroy a protein by causing it to unravel and lose its shape, like frying an egg.
4. Which parts of an amino acid's structure are the same in all amino acids? Which part is unique?
The same parts are the central carbon atom and the unique part is the side group is responsible for properties of each amino acid such as if its is hydroxyl.