Do Now

1
Do Now

• Take out last nights homework so I can check it.
• Which of the following are probably
  carbohydrates?
• C6H12O6 B. C6H14
• C5H10O5 D. Xylose
• E. Xylase

2
Proteins

• This is the enzyme well be using in a lab later
  this week. What do you think it looks like?

3
Proteins have many different functions and
structures.
Proteins do most of the work a cell needs to
stay alive!
4
Proteins are macromolecules made up of amino
acids.
5
There are 20 different amino acids commonly found
in nature.
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Proteins are complex molecules
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Heres an amino acid
Hydrogen atoms not shown
Forms 2 bonds to other amino acids. Called
peptide bonds
This part is different for each kind of amino
acid.
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Peptide bonds form by a dehydration synthesis
reaction JUST LIKE POLYSACCHARIDES!
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Proteins are made of 1 or more polypeptides
(polypeptide single chain of amino acids)
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Pectinase is the protein well be using in the
lab.
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Pectinase attaches to pectin at the active site
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And then breaks a bond in the polysaccharide!
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Many proteins (like Pectinase) are enzymes.
Enzymes speed up all different kinds of reactions!
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ENZYME
SUBSTRATE
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SUBSTRATE
Enzymes are very selective about
which substrates they bind. In other
words, Theyre Specific.
Enzyme
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4 Levels of Protein Structure