We have a NEED for ENERGY

1
We have a NEED for ENERGY

• Spring stores energy
• When spring released, energy released
• Like coiled springs, chemical bonds store energy
• Energy released when bond is broken
• Tighter springs like tighter bonds that stores
  more energy than others

2
What do we use energy for?
3
We have a NEED for ENERGY

• All living things must have energy to live
• Plants trap light energy and store it
• Autotrophs use light energy to make food
• Other organisms cannot use sunlight directly
• Heterotrophs ingest food for energy

4
We have a NEED for ENERGY

• What cell processes require energy?

5
We have a NEED for ENERGY

• ENERGY ATP (adenosine triphosphate)
• 1 adenosine molecule, 3 phosphate groups

6
We have a NEED for ENERGY

• ENERGY ATP (adenosine triphosphate)
• 1 adenosine molecule, 3 phosphate groups
• AMP ADP ATP
• AMP adenosine MONOphosphate
• ADP adenosine Diphosphate
• The more phosphate group bonds, the MORE energy
  required and the MORE energy stored!

7
We have a NEED for ENERGY

• ?Loses phosphate group?
• ?Loses phosphate group?

8
We have a NEED for ENERGY

• How is energy released? Phosphate bonds BREAK!!

P
P
P
Adenosine
Adenosine triphosphate (ATP)
P
P
Adenosine diphosphate (ADP)
P
P
Adenosine
9
We have a NEED for ENERGY

• How do our cells use energy?
• ATP joins with protein breaking phosphate bond
• Protein absorbs energy resulting in ADP
• ADP heads back into cytoplasm
• Now protein has energy to do work

10
Lets go full circle!

• ADP in cytoplasm
• Cytoplasm melting pot of chemicals
• ADP becomes recharged with addition of new
  phosphate group in cytoplasm
• ADP P ? ATP (phosphorylation)
• CYCLE BEGINS AGAIN!

11
We have a NEED for ENERGY
Biology in Motion
12
Check it!

• 1. What is the primary difference in the way
  plants obtain energy and animals obtain energy?

Plants trap light energy and store it for food.
Animals must eat (plants) stored energy.
13
Check it!

• 2. A molecule of adenosine that has one
  phosphate group bonded to it is ______.

• ADP
• AMP
• ATP
• ACP