Biology Unit one

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Author:
Sylver
ID:
220244
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Biology Unit one
Updated:
2013-05-19 10:00:32
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Bio
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Description:
Biology for dummies
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  1. define resolution.
    The ability to distinguish between 2 objects that are close together
  2. Define magnification.
    The number of times greater an image than its object.
  3. Why do scientist stain samples? 
    Name 1 type.
    • In order to see the details of the cells organelles.
    • - Acetic Orcein
  4. Roughly how large is the following:
    -Cell surface membrane
    -Ribosome
    -Virus
    • -Cell surface membrane: 10nm wide
    • -Ribosome: 20nm in diameter 
    • -Virus: 40-100nm in diameter
  5. What are the maximum resolution of the following:
    -human eye
    -Light microscope
    -Electron microscope
    • -Human eye:
    • -Light microscope:
    • -Electron microscope: 
  6. outline function of nucleus.
    To co-ordinate cell; houses genetic information.
  7. Outline function of nucleolus.
    Makes Ribosome and RNA
  8. Outline structure and function of nuclear envelope.
    • -Double membrane structure 
    • -Surrounds nucleus in eukaryote cell
  9. Outline structure and function of:
    -Rough endoplasmic reticulum (R.E.R)
    -Smooth endoplasmic reticulum (S.E.R)
    • -E.R: consist of membrane bound sac called cisternae. They are continuous with outer nuclear membrane.
    • -R.E.R: studded with ribosomes, transports proteins.
    • -S.E.R: makes lipids the cell needs
  10. outline structure and function of Golgi Apparatus.
    • -A stack of membrane bound flattened sac
    • -Used to package and modify proteins into vesicles.
  11. Outline function of Ribosome.
    Used to synthesis proteins in the cell.
  12. Outline structure and function of mitochondria.
    • - Spherical/sausage shape. Inner membrane folded to form cristae. Central part called matrix.
    • -A site where Adenosine triphosphate  (ATP) is produced via Aerobic respiration.
  13. Outline structure and function of chloroplast.
    • -Inner membrane is continuous and has elaborate network of flattened membrane sack called thylakoids. (they look like plates, many stacked called granum.) 
    • -Site of photosynthesis
  14. Outline function of lysosomes.
    -Contain powerful enzymes used to break down materials
  15. Outline role of plasma membrane.
    -form permeable barrier between cell and environment
  16. define division of labour.
    system where different part perform specialised function contributing to the function of the whole.
  17. Outline function of cytoskeleton.
    network of fibres made of proteins that are used to keep cell structure stable

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