BIo Energy - Chapter 5 Notes 5.1 What Is Energy Energy is...

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Chapter 5 Notes 5.1 What Is Energy? • Energy is the ability to do work. • Work is the movement of mass some distance • Our biosphere (global sum of all ecosystems) gets its energy from the sun. • 2 basic forms of energy Potential energy - stored energy • Kinetic energy - energy of motion • Two energy laws: § First law - conservation of energy • Energy cannot be created or destroyed; but it can be changed from one form to another § Second Law - entropy • Energy cannot be changed from one form to another without a loss of usable energy§ Heat is the least usable form of energy in biological systems 5.2 ATP: Energy for Cells Adenosine triphosphate (ATP) Cells use ATP to carry out nearly all activities • One nucleotide attached to 3 phosphate groups makes it unstable Attachment of third phosphate group is very unstable. ATP: Energy for Cells ATP needs energy to be created and can release energy quickly 2. Energy from food is then stored as a phosphate bond in ATP.
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  • Fall '09
  • Valenza
  • Energy, Adenosine triphosphate

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