Bioenergetics

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3.phosphate group: chain of 3

Slide 16

Adenosine Triphosphate

Three phosphate groups-(two with high energy bonds

Last phosphate group (PO4) contains the MOST energy

Slide 17

Breaking the Bonds of ATP

Process is called phosphorylation

Occurs continually in cells

Enzyme ATP-ase can weaken & break last PO4 bond releasing energy & free PO4

Slide 18

How does ATP work ?

Organisms use enzymes to break down energy-rich glucose to release its potential energy

This energy is trapped and stored in the form of adenosine triphosphate(ATP)

Slide 19

How Much ATP Do Cells Use?

It is estimated that each cell will generate and consume approximately 10,000,000 molecules of ATP per second

Slide 20

Coupled Reaction - ATP

The exergonic hydrolysis of ATP is coupled with the endergonic dehydration process by transferring a phosphate group to another molecule.

ATP

ADP + P

H2O

H2O

Slide 21

Hydrolysis of ATP

ATP + H2O  ADP + P (exergonic)

Slide 22

Hyrolysis is Exergonic

Energy Used by Cells

Slide 23

Dehydration of ATP

ADP + P  ATP + H2O (endergonic)

Dehydration (Remove H2O

Slide 24

Dehydration is Endergonic

Energy is restored in Chemical Bonds

Slide 25

Review

Slide 26

How many high energy phosphate bonds does ATP have?

Slide 27

Which is true of photosyntheis?

Anabolic or Catabolic

Exergonic Or Endergonic

Slide 28

The breakdown of ATP is due to:

Dehydration or Hydrolysis

H2O added or H2O removed

Slide 29

Which Reactions are often Coupled in Organisms

Hydrolysis or Dehydration

Anabolism or Catabolism