Bioenergetics
- Created by: benitaxx
- Created on: 18-02-18 17:22
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- Bioenergetics
- Photosynthesis
- Photosynthesis is needed for growth of plants
- To produce glucose molecules energy is needed
- The reactions are endothermic and the energy is supplied by sunlight
- Chlorophyll, found in chloroplasts trap the energy
- Factors affecting phtosynthesis
- Temperature
- As temperature increases so doe the rate of photosynthesis
- Because more energy is being put in
- Rate drops to zero at 45 degrees because enzymes are destroyed
- As temperature increases so doe the rate of photosynthesis
- CO2 concentration
- As CO2 concentration increases, so does the rate of photosynthesis
- Because more energy is provided for reaction
- After a certain point, the CO2 is no longer the limiting factor
- As CO2 concentration increases, so does the rate of photosynthesis
- Light intensity
- As light intensity increases, so does the rate of photosynthesis
- Because more energy is provided for reaction
- After a certain point, light intensity is no longer the limiting factor
- As light intensity increases, so does the rate of photosynthesis
- Temperature
- Converting glucose
- into insoluble starch stored in stem, leaves or roots
- Fat or oil stored in seeds
- Cellulose to strengthen cell walls
- Proteins used for growth
- Required Practical
- Put pond weed into beaker and put a light over it. Move the light closer and closer, counting the bubbles produced for a minute, each time it's mpved
- More bubbles produced, higher rate of photosynthesis because light intensity is increased
- Doubling distance between lamp and pond weed will reduce light intensity by a quarter- inverse square law
- More bubbles produced, higher rate of photosynthesis because light intensity is increased
- Put pond weed into beaker and put a light over it. Move the light closer and closer, counting the bubbles produced for a minute, each time it's mpved
- Respiration and excersise
- Respiration is an exothermic reaction
- Aerobic respiration
- With oxygen
- Glucose+ Oxygen= Carbon dioxide+ water
- Anaerobic respiration
- Without oxygen
- Glucose is no all broken down
- In animals: Glucose= lactic acid
- In plants and yeast: Glucose= Ethanol and carbon dioxide
- In yeast cells it's called fermentation and is used in making bread and alcoholic drinks
- Metabolism
- Sum of chemical reactions in cell or body
- reactions controlled by enzymes and need transfer of energy
- Energy from respiration is used to:
- Glucose to starch, glycogen and Cellulose
- Making lipid molecules from a ,molecule of glycerol and 3 molecules of fatty acids
- use of glucose and nitrate ions to make amino acids
- Breakdown of excess proteins into urea for excretion
- Exercise
- Body demands more energy so respiration needs to increase
- If in exercise the muscles dont get enough oxygen, lactic acid is produced and oxygen debt occurs
- Lactic acid causes the muscles to hurt and prevents them functioning efficiently
- Once exercise is finished, oxygen debt must be repaired
- Blood transports lactic acid to liver where it's broken down after excersise
- Photosynthesis
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