5.13

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Author:
see.jerald
ID:
77966
Filename:
5.13
Updated:
2011-04-06 23:16:12
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ATP shuttles chemical energy drives cellular work
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ATP shuttles chemical energy and drives cellular work
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  1. What does ATP do?
    atp powers nearly all forms of work
  2. What does the adenosine part of ATP consist of?
    adenine a nitrogenous base
  3. what is the triphosphate part contain?
    three negatively charged phosphate groups
  4. Bonds connecting the phosphate groups are unstable and be broken how?
    hydrolysis
  5. is the hydrolysis of ATP exergonic or endo? why?
    Exergonic, releases energy when a phosphate group leaves
  6. What is phosphorylation?
    the transfer of a phosphate group
  7. What are the three types of cellular work?
    Chemical, mechanical, and transport
  8. What drives all 3 types of cellular work?
    ATP
  9. What is an example of mechanical work?
    the transfer of phosphate groups to special motor proteins in muscle cells causes the proteins to change shape and pull on actin filaments, in turn causing them to contract
  10. How can ATP be used in terms of concentration gradients?
    the energy from ATP drives the active transport of solutes across a membrane against their concentration gradient by phsphorylating certain membrane proteins
  11. Why can work be sustained?
    because ATP is renewable resource that cells regenerate

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