Energy = Life Life = Energy

What is the ultimate source of energy on

Earth?• The Sun

What is the difference between Autotrophs and

Heterotrophs?Autotrophs

• “self feeder”

• make food from inorganic molecules

• producers

Heterotrophs• “other eaters”

• get food by eating other organisms

• consumers

How do they obtain their energy?

AutotrophsAutotrophs• Photosynthesis- uses Sun’s energy

to convert water and carbon dioxide into glucose.

Autotrophs and HeterotrophsAutotrophs and Heterotrophs• Cellular Respiration- use oxygen to

convert glucose into ATP.

How does photosynthesis and respiration relate to one

another?

What is energy? the ability to perform work• Potential energy: energy

that is stored; It may be converted to other types of energy.

Kinetic Energy: energy of motion.

Thermal Energy

How is chemical energy a type of potential energy?

• A molecule can store energy between atoms.

• When atoms are released, energy is released.

Organic molecules have structures that give them lots of chemical energy in the form of ATP.

How do we obtain energy from food?

An analogy of respiration

How do cells convert chemical energy into usable

energy?• Chemical energy stored in organic

molecules is converted to energy stored in a molecule called “ATP”

• ATP = Adenosine TriphosphateI use ATP to move

my muscles!

What is the structure of ATP?

• 1 Adenosine molecule

• 1 Ribose molecule = 1 ATP

• 3 Phosphate molecules

How does ATP drive cellular work?

• When a phosphate bond of an ATP molecule is broken, energy is released. The phosphate attaches to another molecule.

What is the ATP Cycle?

ATP ADP ATP ADP ATP ADP