B4
- Created by: superlouasaur
- Created on: 06-04-15 17:01
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- B4- The processes of life
- MRS GREN
- Movement
- Respiration
- Sense
- Reproduce
- Grow
- Excrete
- Nutrition
- Enzymes
- Enzymes are catalysts
- Proteins made up of amino acids
- Cause different shapes
- Lock and key theory
- Only correct molecules fit into active site
- Break down big molecules or join small ones jogether
- At 37 degrees reactions happen too slowly so need enzymes
- Temp/ pH not right enzyme becomes denatured
- Photosynthesis
- 6CO2 + 6H2O--> C6H12O6 + 6O2 (light energy and chlorophyll on arrow)
- Takes place in chloroplasts
- Where chlorophyll absorbs light and uses energy to fuel reaction
- Glucose produced is used for:
- Making other chemicals needed for plant growth
- Storing energy in starch molecules
- Releasing energy in respiration
- Diffusion and gas exchange
- Diffusion
- Molecules in gases and liquids move randomly
- Collide and change direction
- Diffuse from high concentration to low concentration
- Molecules in gases and liquids move randomly
- Gas exchange
- CO2 enter through stomata and oxygen goes out
- Diffusion
- Osmosis
- Moving water molecules in and out of cells
- Specific type of diffussion
- Partially permeable membrane only lets smaller molecules through
- Flow of water from dilute to concentrated
- Osmosis drives the uptake of water for plants
- Active transport
- Nitrate ions absorbed by root hair cells in plants
- Pump nitrates from soil into roots
- Cells transport molecules through the membrane
- Limiting factors- photosynthesis
- Light
- Increase in light= increase in reaction rate
- CO2
- More CO2 to react
- Light
- Respiration
- Aerobic
- C6H12O6+ 6O2 -->6CO2 +6H2O
- Anaerobic
- Glucose---> lactic acid
- When cannot supply oxygen quick enough
- n plants it produces ethanol = CO2
- Aerobic
- Bioethanol
- From sugar
- Can be used in cars
- Yeast converts sugar into ethanol
- Biogas
- Obtained from animal manure or human waste
- Used to heat buildings
- Bacteria break down the matter to make methane
- MRS GREN
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