BIOLOGY 4:CHAPTER 2: ATP
- Created by: hsmith08
- Created on: 21-04-15 18:08
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- ATP
- Why do we need energy?
- Metabolism- all reactions taking place in living organisms
- movement- both within an organism and the organism itself
- active transport- ions and molecules go against their concentration gradient
- maintenance, repair and division
- production of substances
- maintenance of body temperature
- What is energy?
- 'ability to do work'
- 1. Light energy from the sun is converted by plants into chemical energy
- 2. Chemical energy from photosynthesis is converted to ATP during respiration
- 3. ATP is used by cells to perform useful work
- takes a variety of forms, eg light and heat
- cannot be created or destroyed
- measured in joules (J)
- 'ability to do work'
- ATP + (H2O) ->ADP+Pi+E
- photophosphorylation-
- takes place in chlorophyll containing plant cells during photosynthesis
- oxidative phosphorylation-
- occurs in mitochondria during electron transport chain
- substrate-level phosphorylation
- occurs when phosphate groups are transferred from donor molecules to ADP (in glycolysis)
- photophosphorylation-
- Roles
- immediate source of energy as it is easily broken down
- break down is single step reaction
- ATP is rapidly re-formed
- released in small, manageable amounts
- immediate source of energy as it is easily broken down
- Why do we need energy?
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