Biology Chapter One
- Created by: AnnabelSadd
- Created on: 04-06-16 14:06
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- Biology B2: Chapter One
- Cells
- Animal cells
- nucleus: contains gene material
- cytoplasm: gel-like. chemical reaction place
- cell membrane: holds cell together. controls what goes in n out
- Mitochondria = reactions for respiration take place, releases energy
- Ribosomes = where protein synthesis takes place
- Plant cells
- Cell Wall = supports and strengthens. cellulose
- Vacuole = contains cell sap, weak solution of sugar n salts
- Chloroplast= Photosynthsis occur, contain chlorophyll
- Animal cells
- Special cells
- R Blood cells
- Concave shape = big surface area for absorbing oxygen
- No nucleus = more room for hemoglobin?
- Bacteria cell
- Carries out all 7characterist of life - MRS GREN
- Cytoplasm, cell wall, no nucleus, plasmids,
- Yeast cells
- ten times the size of a bacterium)
- nucleus, cytoplasm, mitochondria, a vacuole, cell wall & membrane
- Sperm and Egg cells
- Egg = Huge food reserves to feed the embryo
- Sperm = Long tail + streamlined head + lots of mitochondria
- R Blood cells
- Diffusion
- Diffusion is the movement of particles from an area of high conc to an area of low conc.
- both liquids and gases
- bigger the difference of concentration = faster the diffusion rate
- Cell mem: Holds cell together, particles in n out, small particles diffuse thro
- Rate of diffusion depends on: Distance = not far Concentration difference. Big S.A = more S.A
- Photsynthesis
- Carbon Dioxide + Water (Sunlight) --> Glucose + Oxygen
- Photosynthsis = Process produces food for plants
- Happens inside chloroplasts which contain chlorophyll that absorb sunlight
- Light: from the sun?
- Chlorophyll: substance found in chloroplasts?
- Co2: diffuse from the air into leaf?
- Water: from soil up roots / stem into leaf
- Limit factors
- Too little Co2
- Raw material needed for photosynthsis
- Increased amount of CO2 = rate
- In lab = dissolve sodim- hydro carbnte=Co2
- Not enough light
- Light provides energy for photosynthsis
- Increased light = rate
- In a lab = moving a lamp closer, further away
- ??Greenhouse = trap sun's heat + keeps pests / diseases out?Artificial light = photosynthsis can happen at night? C02 = paraffin heater = Co2
- Temperature has to be just right
- Too Cold - work slowly
- Plant too hot - enzymes are denatured
- The temp affects the enzymes needed for photosynthsis
- Too little Co2
- Cells
- Temperature has to be just right
- Too Cold - work slowly
- Plant too hot - enzymes are denatured
- The temp affects the enzymes needed for photosynthsis
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