BIOLOGY UNIT 1 REVISION

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  • Biology Unit 1 OCR.
    • The maximum resolution for the light microscope is 200nm.
    • Increasing temperature=increased kinetic energy.
  • The maximum resolution for the electron microscope is 0.20nm.
    • The maximum resolution for the light microscope is 200nm.
  • The magnification possible with a TEM is x500,000.
    • The maximum magnification possible with a SEM is about x100,000.
      • The maximum resolution for the electron microscope is 0.20nm.
      • TEM is better at MAGNIFICATION.
        • The magnification possible with a TEM is x500,000.
        • Electron Microscopes are better at RESOLUTION.
          • The maximum magnification possible with a SEM is about x100,000.
          • DIVISION OF LABOUR is the specific role of each organelle within a cell.
            • Biology Unit 1 OCR.
              • Increasing temperature=increased kinetic energy.
          • Microtubules may be used to move a microorganism or to waft a liquid past the cell.
            • DIVISION OF LABOUR is the specific role of each organelle within a cell.
              • The detail inside of the cells revealed by the electron microscope is called the cell's ultrastructure.
                • ROUGH ER - transports proteins that were made by the attached ribosomes.
            • The instructions to make the hormone are in the DNA in the nucleus.
              • The specific instruction to make the hormone is known as the gene for that hormone. A gene is on the chromosome.
                • The nucleus copies the instructions in the DNA into a molecule of mRNA.
            • The mRNA molecule leaves the nucleus through a nucleur pre and attachesto a ribosome.
              • The nucleus copies the instructions in the DNA into a molecule of mRNA.
            • The Golgi Apparatus packages the protein and may also modify it so that it is ready for release. The protein is now packaged into a vesicle and moved to the cell surface membrane, where it is secreted outside.
            • CHANNEL PROTEINS
              • Somemolecules and ions that are too large and too hydrophilic to pass directly through the phospholipid bilayer enter and leave cells using these protein channels.
            • Allow the movement of some substances across the membrane.
              • CHANNEL PROTEINS
                • Somemolecules and ions that are too large and too hydrophilic to pass directly through the phospholipid bilayer enter and leave cells using these protein channels.
            • CARRIER PROTEINS
              • USE ATP.
              • E.G Root hair cells.
            • Move substances ACROSS the membrane.
              • CARRIER PROTEINS
                • USE ATP.
                • E.G Root hair cells.

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