Amino acids-each amino acid consists of a central carbon atom bonded to four partners (Hydrogen, Amino group, Carboxyl group and side group(R-group)).
*The side group is responsible for the particular chemical properties of each amino acid.
Polypeptide-it is made up of the amino acids linked together.
*Each link is created by a dehydraton reaction between the amino group of one amino acid and the carboxyl group of the next amino acid in the chain.
Proteins-made up of one or more polypeptide chains.
-a polymer constructed from a set of just 20 kinds of monomers called amino acids.
Denaturation-An unfavorable change in temprature, pH, or some other quality of the environment can cause a protein to unravel and loose its normal shape. the function of it has been destroyed as the shape of it has been destroyed.
Concept Check 5.4
1. Give at least two examples of proteins you can "see" in the world around you. What are their functions?
Cheese and egg. Help us to grow and repair.
2. Relate amino acids, polypeptides, and proteins.
Polypeptides are made up of amino acids linked to each other, and proteins are made up of one or more polypeptides.
3. Explain how heat can destroy a protein.
Heating unfolds proteins because most of the forces that maintain folding are weeak attractions between pairs of side groups, and between side groups and water. Hot molecules collide with enough force to overcome these weak attractions.
4. Which parts of an amino acid's strcture are the same in all amino acids? Which part is unique?
The hydrogen atom, the amino group and the carboxyl group. The side group part is unique.
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