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2.1.3 Cell Structure and Functions.

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Presentation on theme: "2.1.3 Cell Structure and Functions."— Presentation transcript:

1 2.1.3 Cell Structure and Functions. http://www.youtube.com/watch?v=o1GQyciJaTA

2 2.1.4 comparing the relative sizes of molecules……………….. You have 3 minutes to answer the following: Give two reasons why we use light microscopes and give the main reason why we use the electron microscope.

3 What units of measurement do we use in biology?  International System. Why?  So that the same units are used in every country in the world.  Copy the following information.

4 SI units (international system) 1 metre (m) = 1m 1 millimeter (mm) = 1mm = 1x10 -3 m 1 micrometre (μm) = 1μm = 1x10 -6 m 1 nanometre (nm) = 1nm = 1x10 -9 m 1 centimetre cubed = 1cm 3 1 decimetre cubed = 1dm 3 (deci = 1/10 of a metre = 10 cm) 1 second = 1s 1 minute = 1min 1 hour = 1h Concentration is measured in mol dm -3 This just means mols per decimetre cubed.

5 Activity In pairs: Consider the following structures: Put them in order of size starting with the smallest.  a hydrogen molecule.  a human cheek cell.  a cell organelle(mitochondrion).  a virus.  a bacterium.  plasma membrane

6 Answers  a hydrogen molecule.  plasma membrane  a virus.  a bacterium.  a cell organelle(mitochondrion).  a human cheek cell. See page 10 of your text book.


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