Karteikarten
ATP
Karten in diesem Stapel (7)
- 1Why do organisms need energy?Metabolism
Movement
Active Transport: Ions and molecules move against a concentration gradient which requires energy
Maintenance, repair and division of cells
Production of substances such as enzymes and hormones
Maintenance of body temperature - 2How does ATP store its energy?1)ATP has 3 phosphate groups which makes the molecule unstable and so have a low A.E (therefore easy to break)
2)When they do break energy is released
ATP+H2O→ADP+Pi
As water is used, its a hydrolysis reaction - 3Describe how ATP is synthesised from ADPThis occurs in 3 ways:
1) Photophosphorylation: takes place in chlorophyll
2) Oxidative phosphorylation: Occurs in mitochondria during the process of electron transport
3) Substrate-Level phosphorylation: This is when phosphate groups are tranferred from donor molecules to ADP to make ATP - 4Why is ATP a better immediate source of energy than glucose?-The hydrolysis of ATP to ADP is a single step reaction that releases immediate energy
- Each ATP molecule releases less energy than each glucose molecule. Therefore, the energy for reaction is released in smaller, more manageable quantities.
so it releases small amounts of energy - 5ATP is useful in many biological processes. Explain why. 4 Marks
- 6Describe how ATP is made in mitochondria. 6 Marks
- 7Humans synthesise more than their body mass of ATP each day. Explain why it is necessary for them to synthesise such a large amount of ATP 2 Marks
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- A-Level Biology-Unit 4 Karteikarten am ATP, erstellt von N K am 31/12/2014.
- Erstellt von
- N K
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