Energy in a Cell

All living organisms need energy

Cell Energy• All living organisms must be

able to obtain energy from the environment in which they live.

• Plants and other green organisms are able to trap the light energy in sunlight and store it in the bonds of certain molecules for later use.

• Other organisms cannot use sunlight directly

• They eat green plants. In that way, they obtain the energy stored in plants.

Autotrophs & Heterotrophs• Autotrophs

(auto=self troph= to feed)• are the producers

• Heterotrophs (hetero=other troph = to feed)• are the consumers

Living creatures use ENERGY

mitochondria

• Metabolism– all the reactions an organism performs to

make & use energy• eating & digestion & elimination of

waste• synthesis = building molecules (could be

photosynthesis• cellular respiration = making energy

Chloroplasts

Work and the need for energy

• Active transport, cell division, movement of flagella or cilia, and the production, transport, and storage of proteins are some examples of cell processes that require energy.

• The molecule in cells that is a quick source of energy for any organelle is adenosine triphosphate or ATP for short

ATP

ATP structure

• ATP is composed of adenine (a nitrogenous base) & ribose, (a sugar ,also found in RNA) with three phosphate groups attached

ATP shuttles chemical energy and drives cellular work

• Hydrolysis of ATP releases energy by transferring its third phosphate to some other molecule

• in the process, ATP energizes molecules

2009-2010

ATP

What is energy in biology?

Whoa! HOT stuff!

Adenosine TriPhosphate