Energy and Life
Warm up
 Define these words
 ATP
 Heterotroph
 Autotroph
 photosynthesis
Date 11/11
Learning Objectives
 Describe the role of ATP in cellular activities.
 Explain where plants get the energy they need
to produce food.
Adenosine Triphosphate (ATP)
Adenosine triphosphate (ATP) is one of the most important
compounds that cells use to store and release energy.
adenine
ribose
3 phosphate groups
Adenosine Diphosphate (ADP)
Adenosine diphosphate (ADP) has two phosphate groups
instead of three.
adenine
ribose
2 phosphate groups
Storing Energy
When a cell has energy available, it can store small
amounts of it by adding phosphate groups to ADP
molecules, producing ATP.
Making ATP
When a phosphate group is added to an ADP molecule,
ATP is produced.
Releasing Energy
ATP can easily release and store energy by breaking and
reforming the bonds between its phosphate groups.
ATP Production
Cells must produce ATP. In photosynthesis, plants convert
the energy of sunlight into chemical energy stored in the
bonds of carbohydrates.
Heterotrophs and Autotrophs
Organisms that make their own food are autotrophs.
Organisms that obtain food by consuming other living things
are heterotrophs.
Photosynthesis
Photosynthesis
• Photo means “light” and synthesis means “putting together”
What happens during the process of photosynthesis?
• plants convert the energy of sunlight into chemical energy
stored in the bonds of carbohydrates (sugar and starches)