Topic 1-Key concepts in Biology

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  • Created by: Radd_fr
  • Created on: 25-04-19 18:25
Cells
Organisms can be Prokaryotes or Eukaryotes.Animal cell:Nucleus,cytoplasm,cell membrane,mitochondria ribosomes.Plant cell have 3 more Cell wall,Chloroplasts & sap vacuole.Bacteria cell:Chromosomal DNA Plasmid DNA Ribosomes,cell membrane,Flagellum
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Specialised Cells
Egg cells:contains nutrients in the cytoplasm to feed the embryo,has haploid cells,membrane changes structure to stop more sperms.Sperm cells:long tail to swim to egg,mitochondria in mid section,Acrosome stores enzymes & a haploid nucleus
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Microscopy
Light microscopes-beneficial for things like nuclei & chloroplasts Electron microscopes-Have higher magnification and resolution.Magnification=Image size/real size
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Enzymes
Enzymes are catalysts produced by living things.Catalysts speed up a reaction.They need right temp,PH & substrate concentration. Rate=1000/Time
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Enzymes in breakdown and synthesis
carbohydrases ~carbohydrates¬simple sugars proteases~proteins¬amino acids Lipases~lipids¬glycerol & fatty acids
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Diffusion and Active Transport
Diffusion=Overall net movement of particles from high to low concentration.Active transport=movement of particles across a membrane against concentration gradient
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Osmosis
Osmosis= the result of diffusion across a semipermeable membrane from a lower concentration to a higher one.Percentage change=final mass-intital÷inital x100
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Card 2

Front

Egg cells:contains nutrients in the cytoplasm to feed the embryo,has haploid cells,membrane changes structure to stop more sperms.Sperm cells:long tail to swim to egg,mitochondria in mid section,Acrosome stores enzymes & a haploid nucleus

Back

Specialised Cells

Card 3

Front

Light microscopes-beneficial for things like nuclei & chloroplasts Electron microscopes-Have higher magnification and resolution.Magnification=Image size/real size

Back

Preview of the back of card 3

Card 4

Front

Enzymes are catalysts produced by living things.Catalysts speed up a reaction.They need right temp,PH & substrate concentration. Rate=1000/Time

Back

Preview of the back of card 4

Card 5

Front

carbohydrases ~carbohydrates¬simple sugars proteases~proteins¬amino acids Lipases~lipids¬glycerol & fatty acids

Back

Preview of the back of card 5
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