What are living creatures made of?
Why do we have to eat?
ELEMENTS OF LIFE
▪96% of living organisms is made of: ■carbon
MOLECULES OF LIFE
▪Put C, H, O, N together in different ways to build living organisms
▪What are bodies made of? carbohydrates ◆
▪sugars & starches
WHY DO WE EAT?
▪We eat to take in more of these chemicals
Food for building materials
▪to make more of us (cells)
Food to make energy
▪to make ATP
WHAT DO WE NEED TO EAT?
▪Foods to give you more building blocks
& more energy
▪for building & running bodies
DON’T FORGET WATER
65% of your body is H2O
◆water is inorganic
▪doesn’t contain carbon
▪Rest of you is made of carbon molecules organic molecules
How do we make these molecules?
We build them!
BUILDING LARGE MOLECULES OF LIFE
▪Chain together smaller molecules building block molecules = monomers
▪Big molecules built from little molecules polymers ◆
BUILDING LARGE ORGANIC MOLECULES
▪Small molecules = building blocks
▪Bond them together = polymers
BUILDING IMPORTANT POLYMERS
Carbohydrates = built from sugars sugar – sugar – sugar – sugar – sugar – sugar
Proteins = built from amino acids amino – amino – amino – amino – amino – amino acid acid acid acid