The function of proteins
protein: a polymer constructed from a set of just 20kinds of monomers alled amino acids
- responsible for all of day-to-day functioninf of organism
Amino acidsAmno acids monomers: consists of a central carbon atom bonded to four patners
-carbon's partners
1. hydrogen atoms
2. carboxyl group
3. amino group
*diff. in type of amino acid=side group that attaches to fourth bond of central carbon
-responsible for particular chemical properties of each amoni acid
Building a protein
polypetide: a chain that is linked by amino acids together to created proteins
- link-dehydration reaction- amino group of 1amino acids & carboxyl group of next amino acid
- protein= 1/2 polypetide chains
*body can make variety of proteins by arranging diff. amino acids in diff. order
Protein shape
*protein in the simple form of amino acids linked together can not function properly
-functional protein= one or more polypeptides precisely twisted
* protein's shape is influenced by surrounding environment which is usually water
-water attrat hydrophilic; reject hydrophobic
- hydrophilic amino acids orient toward olutside edges of protein
* An unfavorablechange in temp. pH or other quality of environment can cverse a protein a unravel and lose its normal shape
- Since protein's function depends on shape, protein, that becom denatured and loses its shape also lose its ability to work properly
-responsible for particular chemical properties of each amoni acid
Building a protein
polypetide: a chain that is linked by amino acids together to created proteins
- link-dehydration reaction- amino group of 1amino acids & carboxyl group of next amino acid
- protein= 1/2 polypetide chains
*body can make variety of proteins by arranging diff. amino acids in diff. order
Protein shape
*protein in the simple form of amino acids linked together can not function properly
-functional protein= one or more polypeptides precisely twisted
* protein's shape is influenced by surrounding environment which is usually water
-water attrat hydrophilic; reject hydrophobic
- hydrophilic amino acids orient toward olutside edges of protein
* An unfavorablechange in temp. pH or other quality of environment can cverse a protein a unravel and lose its normal shape
- Since protein's function depends on shape, protein, that becom denatured and loses its shape also lose its ability to work properly
Key concept
1.Give at least two examples of proteins you can see in the world around you. What are their functions?
2. Relate amino acids, polypeptides, and proteins.
3. Explain how heat can destroy a protein.
4. Which parts of an amoino acids'sd structure are the same in all amino acids? Which part is unique?
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