1. Aim: Proteins
Warm-up:
HW:

2. Proteins What it does in the BODY? Build and repair muscle
Meat, Fish, Nuts, Beans, & Egg Whites
Contain C, H, O, N
What it does in the BODY?
Build and repair muscle
Enzymes, Antibodies,
Hormones
insulin

4. Proteins O | H —C— || C—OH N Building block = amino acids –
20 different amino acids
There’s 20 of us…
like 20 different letters in an alphabet! Can make lots of different words N H |
—C—
C—OH || O
variable group

5. Amino Acid Structure
VARIABLE GROUP

6. Different Types of Proteins
1 amino acid = Peptide
2 amino acids = Dipeptide
Many amino acids = Polypeptide

7. -CHAINS of amino acids make up proteins
-Proteins can be 100’s of amino acids together

9. For proteins: SHAPE matters!
Proteins fold & twist into 3-D shape
that’s what happens in the cell!
Different shapes = different jobs
growth hormone
hemoglobin
pepsin

10. It’s SHAPE that matters!
Unfolding a protein destroys its shape
Wrong shape = can’t do its job
Unfolding proteins = “denature”
Increase in Temperature
pH (acidity)
unfolded “denatured”
folded