Download Proteins

Good Morning!
Do Now: Grab a “6. Protein” note packet and
answer the following question on the back:
Question: How do people build up their muscles?
6: Proteins
Mr. Wiley
Living Environment
Q: What is a protein?
I. What are proteins?
- Proteins are large organic molecules
- Composed of amino acids
- Perform several functions in the body
including:
Ex: neurotransmitters, hormones, enzymes, pigments,
antibodies, build muscles, receptors, make up cell
membrane
- A Proteins shape determines its function
II. How do amino acids work to build proteins?
• Amino acids look like butterflies
• The information for amino acids comes from
your genetics (DNA)
• There are 20 different types of amino acids
Protein Shape
Proteins have something called quaternary
sequence, which is kind of like a 4D movie.
Quaternary- Fourth in order
Sequence- order of events
Q: How do amino acids build a protein?
STEP 1: Primary Sequence
• Chain of Amino Acids
• THE MOST IMPORTANT
• Determined by your genes (DNA)
Q: How do amino acids build a protein?
STEP 2: Secondary Sequence
• Folding/Coiling of Amino Acids
• Determined by the sequence of
amino acids in primary
sequence
• Caused by hydrogen bonds
Alpha
Helix
(Twisty!)
Beta Sheet
(Crinkle Cut)
Q: How do amino acids build a protein?
STEP 3: Tertiary Sequence
• Folding of Secondary Sequence
• Determined by the sequence of
amino acids in primary and
folding in secondary
• Fold to hide hydrophobic
regions
Q: How do amino acids build a protein?
STEP 4: Quaternary Sequence
• When multiple tertiary
sequence proteins
combine.
• Not all proteins do this
III. Practice Questions
1. The shape of a protein molecule is
influenced by:
a)Whether it is organic or inorganic
b)The sequence of amino acids in it
c)The number of genes found in the
nucleus
d)The number of chromosomes in a
cell
III. Practice Questions
2. Which statement concerning proteins is
NOT correct?
a. Proteins are long, usually folded
chains.
b. The shape of a protein determines its
function.
c. Proteins can be broken down and used
for energy.
d. Proteins are bonded together,
resulting in simple sugars.
III. Practice Questions
3. The sequence of subunits in a protein is most
likely dependent on:
a)Region in the cell where the enzymes are
produced
b)DNA in the cell
c)Types of cells in which starch is found
d)Kinds of materials in the cell membrane
Protein Structure and Function
III. Practice Questions
4. The diagram provides some information
concerning proteins. Which phrase best
represents A?
a.
b.
c.
d.
Sequence of amino acids
Sequence of simple sugars
Sequence of starch molecules
Sequence of ATP molecules
So, what?
What’s the big deal if my
protein’s wrong?
Wacky Proteins
WRITE DOWN TWO THINGS
YOU LEARNED AND ONE
QUESTION.
1.
2.
Question: