Read the summary and the most important questions on biology chapter 3

• 1 the microscope

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• what are the ten things on a microscope

  1. tube

  2. revolving nose piece

  3. objectives

  4. stage clips

  5. diaphgram

  6. light

  7. eyepiece

  8. arm

  9. stage

  10. coarse and fine focus

• 2 looking at cells

• how many more cells are there in your body than people on earth

  10xx

• what would be happen when a speciamen of cells would be not stained?

  they would be colourless and they are difficult to distinguish

• 3 basic parts of a cell

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• what do the groups of DNA molecules

  the combinations of the groups provide instructions for the cell to make chemicals to keep it alive or to build its cell parts.

• say in short what cytoplasm is

  - watery jelly to fill up the cell with dissolved substance

  - it may contains stored food

• say in a short sentece what a cell membrame is

  has pores where chemicala pass through

  keeps liquid inside

• what does a cell membrane?

  it covers the outside of the cell

  dissolved substances such as food, oxygen and corbon dioxide can pass through the cell membrane

  some harmful chemicals are stopped from entering the cell by the memebrane

• 4 parts found only in plant cells

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• if you look through a microscope what are A: the green dotsB: the linesC: the coloured substance

  A: chloroplast

  B: cell membrane

  C: cytoplasm

• say in a short sentence what the cell wall is

  - give support to a cell

  - made of cellulose

• where can you find the cell wall

  the cell wall is found outside the membrane of a plant cell.