CELLULAR ENERGY All Cells Need Energy n Cells

CELLULAR ENERGY

All Cells Need Energy n Cells need energy to do a variety of work: n Making new molecules. n Building membranes and organelles. n Moving molecules in and out of the cell. (Maintaining homeostasis) n Movement.

Where Does A Cell Get Energy? n Food is broken down to a form the cell can use. n Extra energy is stored in an ATP molecule, a nucleotide.

What Is ATP? n 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. n When the bond is broken, energy is released and ADP is formed. n 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 n A adenosine n + P + phosphate AMP + adenosine monophosphate + n ADP adenosine diphosphate + + adenosine monophosphate P phosphate ADP P phosphate AMP adenosine diphosphate ATP adenosine triphosphate

Releasing Energy n ATP adenosine triphosphate ADP + ENERGY adenosine diphosphate + phosphate+ energy

Making Energy n Cells make energy in two ways: n Photosynthesis – takes place in the chloroplasts. n Respiration – takes place in the mitochondria.

BYE Napping again!