1. Proteins

2. Multipurpose molecules
Proteins:
Multipurpose molecules

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

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

5. 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
collagen

6. It’s SHAPE that matters!
Proteins do their jobs, because of their shape
Unfolding a protein destroys its shape
wrong shape = can’t do its job
unfolding proteins = “denature”
temperature
pH (acidity)
unfolded “denatured”
In Biology,
it’s not the size,
it’s the SHAPE that matters!
folded