CELLS

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  • Created by: Jennifer
  • Created on: 30-03-12 16:03

Cells

  • cells are the smallest unit of living tissue
  • in ANIMAL cells:
  • nucleus-controls all activities of cell, contains instructions for making new cells/organisms
  • cell membrane-controls passage of substances in and out of cell
  • cytoplasm-liquid gell in which most of the chemical reactions needed for life take place
  • mitochodria-structures in cytoplasm where oxygen is used and most of the energy is released during respiration
  • ribosomes-where protein synthesis takes place, all proteins needed in cell made here
  • in PLANT cells:
  • same features as animal cells
  • cellulose cell wall- in all plant cells; strengthens cell and gives it support
  • permanent vacuole-in most plant cells; keeps plant rigid to support plant
  • chloroplasts-only in cells that live above sea level; absorb light to make food by photosynthesis

Specialised cells

  • smallest living organisms are single cells
  • carry out all functions of life (eg. feeding, respiration, excretion, reproduction)
  • most organisms are bigger and made up of lots of cells
  • some become specialised in order to carry out particular jobs
  • when becomes specialised its structure adapted to suit particular job it does
  • as result they often look very different to 'typical' animal/plant cells

Root Hair Cell

  • in plants
  • increase surface area for water to move into the cell
  • has large permanent vacuole- affects movement of

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