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BIOl 1015 Chapter 8.3 Lecture Notes $11.19   Add to cart
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BIOl 1015 Chapter 8.3 Lecture Notes

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This is a comprehensive and detailed lecture note on Chapter 8.3;from Campbell Biology textbook for Biol 1015. ***An Essential Study Resource!!

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  • December 3, 2024
  • 3
  • 2022/2023
  • Class notes
  • R. brown
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CONCEPT 8.3: ATP powers cellular work by coupling exergonic reactions to endergonic
reactions
• A cell does three main kinds of work:
– Chemical work—pushing endergonic reactions
– Transport work—pumping substances across membranes against the direction of
spontaneous movement
– Mechanical work—such as beating cilia or contracting muscle cells

• Cells manage energy resources to do work through energy coupling, the use of an
exergonic process to drive an endergonic one
• Most energy coupling in cells is mediated by ATP

The Structure and Hydrolysis of ATP
• ATP (adenosine triphosphate) is composed of ribose (a sugar), adenine (a nitrogenous
base), and three phosphate groups
• In addition to energy coupling, ATP functions as one of the nucleoside triphosphates used
to make RNA




• Energy is released from ATP when the terminal phosphate bond is broken by hydrolysis,
the addition of a water molecule
• The energy does not come directly from the phosphate bonds, but from the chemical
change to a state of lower free energy in the products

• ATP releases more energy with the loss of a phosphate than most other molecules could
deliver
• Repulsion between the negative charges of the three phosphate groups creates a lot of
potential energy
• The triphosphate tail is the chemical equivalent of a compressed spring

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