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Proteins Sec 2.7 pg 37-39
• Last day’s homework:
–Read the protein summary sheet &
highlight big ideas
–Answer 4 qs on back side of summary
What is the monomer that makes
up proteins? Draw an Example.
• The monomer is an amino acid.
* How to Identify an Amino Acid
• Central Carbon bonded to a Hydrogen AND:
i) Amino Group –NH2
ii) Acidic Group –COOH
iii) “R” group- remainder group differs
between amino acids
What is the generic name of a long
chain of amino acids?
• A long chain of amino acids is called
a polypeptide.
How do amino acids bind together to
form a dipeptide? Draw the process
• Condensation synthesis!
Peptide Bonds:
– form between amino
acids & join them
– Amine group combines
with carboxyl group of
next amino acid
– Atoms of O,C, C & H share
electrons (unevenly)
– Polar bond (O is more
neg, H is more pos)
Complete the table about the
levels of organization in a protein
Level of Organization
Description of Shape
Type of Bond
Primary
Linear
Peptide bonds
Secondary
Alpha-helix or Pleated sheet Hydrogen bonds
Tertiary
3-D structure
Bonds between R groups:
Can involve Hydrogen
bonds, covalent, or ionic
bonds or disulfide bonds all
can occur
Quaternary
When 2 or more
polypeptide chains join
together
Bonds between R groups
also! (many different kinds)
Today’s Mission
• Build me pipe cleaner protein in partners!
• Follow instructions 1-6 and show me your
final protein
• Complete the Qs on the handout as you go!