CELLULAR ENERGY

All Cells Need Energy Cells need energy to do a variety of

work: Making new molecules. Building membranes and

organelles. Moving molecules in and out of the

cell. (Maintaining homeostasis) Movement.

Where Does A Cell Get Energy? Food is broken down to a form the

cell can use. Extra energy is stored in an ATP

molecule, a nucleotide.

What Is ATP? ATP – adenosine triphosphate is a

molecule made up of an adenine+ ribose, (adenosine), and 3 phosphate groups.

Adenine

Ribose

How Does ATP Work?

Energy is stored in the bond between the second and third phosphate group.

When the bond is broken, energy is released and ADP is formed.

Adenine

Ribose

ADP-ATP is a cycle

ATP – Energy Currency

• Within a cell, formation of ATP from ADP and phosphate occurs over and over, storing energy each time.

• As the cell uses energy, ATP breaks down repeatedly to release energy and form ADP and phosphate.

Storing Energy A + P AMP adenosine + phosphate adenosine monophosphate

AMP + P ADP adenosine monophosphate + phosphate adenosine diphosphate

ADP + P ATP adenosine diphosphate + phosphate adenosine triphosphate

Releasing Energy

ATP ADP + P + ENERGY

adenosine triphosphate adenosine diphosphate + phosphate+ energy

Making Energy

Cells make energy in two ways: Photosynthesis – takes place in

the chloroplasts. Respiration – takes place in the

mitochondria.

ANNNDD… WE’RE DONE!!

Napping again!