Biology B2

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  • Created by: Sim Sidhu
  • Created on: 28-11-15 17:14

Cells and Simple Cell Transport (Animal and Plant

  • Nucleus- controls the activites in the cell.
  • Cytoplasm- is where most of the chemical reations in the cell takes place.
  • Cell membrane- it controls what substances enter and leave the cell.
  • Mitochondria- is where repiration takes place and releases energy.
  • Ribosomes- is where protein synthesis occurs.
  • Cell wall-is made out of cellulose which strengths the cell. (only plant and algal cells)
  • Chloroplasts - used to absorb light energy from Sun to make food. (only plant and algal cells)
  • Vacuole- permanent filled with cell sap.(only plant cells)
  • (http://www.bbc.co.uk/staticarchive/f9468650f741d0b706b56c467eb28b4e02cef04d.gif)
  • Bacterical Cell consits of cytoplasm and membrane surrounded by cell but the genes are not in a distinct nucleus but yeast cells have nucleus and are single-celled organism.
  • Specialised cells carry out a certain function such as sperm and egg cell for reproduction, white blood cell for the destruction of pathogens, root hair cell for trnasporting water through its thin tail and red blood cell for transporting oxygen around the body, Stem Cell the only unspecialised cell that can transform to any kind of cell, leaf cell for process of photosynthesis. Also name their adaptations.  
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Dissovled Substances (Diffusion)

  • Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout.
  • The greater the difference in concentration, the faster the rate of diffusion. Also when the surface area is increased, the distance between the high and low concentration area is decreased.
  • Dissovled Substances can be move in and out of cell by diffusion.
  • Example of the difussion of oxgen through the aveloil 

(http://learningon.theloop.school.nz/moodle/pluginfile.php/47536/mod_book/chapter/864/diffusion_alveolus.jpg)

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