2. _________________________
Proteins:
_________________________

3. Proteins Examples ______________________ collagen, keratin insulin
digestive enzyme in stomach
hormone that controls blood sugar levels
pepsin
collagen (skin)

4. Proteins Function: many, many functions ________________________
signals from one body system to another
insulin
muscle
protect against germs
help chemical reactions

5. Proteins —N— H | —C— C—OH || O Building block = __________________ –
amino
acid –
________________________
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

6. Amino acid chains Proteins Each amino acid is different
amino acids chained into a polymer
amino acid
Each amino acid is different
__________________________________

7. Water-fearing amino acids
Hydrophobic
__________________________________
try to get away from water in cell
the protein folds

8. Water-loving amino acids
Hydrophillic
__________________________________
try to stay in water in cell
the protein folds

9. For proteins: SHAPE matters!
___________________________________
that’s what happens in the cell!
It’s a helix or B sheet within a single region. Can have both in one protein but a specific region is one or another
growth hormone
hemoglobin
pepsin
collagen

10. It’s SHAPE that matters!
__________________________________ __________________________________
Unfolding a protein destroys its shape
wrong shape = _____________________
unfolding proteins = ________________
temperature
pH (acidity)
unfolded “denatured”
folded
In Biology,
it’s not the size,
it’s the SHAPE that matters!

11. Let’s eat some Proteins!