9. 1. TEM 2. TEM 3. SEM 4. SEM 5. SEM 6. TEM

10.  Write answer on mini whiteboards

20.  Past Paper Question Jan 2009

22.  Most organelles are found in both plant and animal cells.  They have the same function in each cell type.  Each organelle in a cell has a specific role within the cell.  This is termed ‘division of labour’  An example of this is in protein synthesis.

23.  Construct a cartoon strip or flow diagram to show how a protein is synthesised, ensuring you highlight the role of each organelle  Use p14 of the textbook

24. A eukaryote is any organism consisting of one or more cells that contain DNA in a membrane-bound nucleus, separate from the cytoplasm. plants a diverse group known as the protists (or protoctists or protozoa). All eukaryotic cells contain a large number of specialized, membrane- bound organelles. Eukaryotes include: fungi animals

25. A prokaryote is any organism – usually single-celled – whose DNA is suspended freely in the cytoplasm. The word means ‘before the nucleus’. bacteria archaea. Prokaryotes have simpler structure than eukaryotes, lacking organelles such as the nucleus, mitochondria & chloroplasts. Prokaryotes can be divided into two groups:

26. ProkaryoteEukaryote Commonly up to 40 micrometres in diameter DNA is circular and free in the cytoplasm DNA is associated with proteins, forming chromosomes 18 nanometre diameter ribosomes ER present Very few organelles, none with double membrane Cell wall sometimes present

27. ProkaryoteEukaryote Smaller than EukaryoteCommonly up to 40 micrometres in diameter DNA is circular and free in the cytoplasm DNA is linear and in the nucleus DNA is nakedDNA is associated with proteins, forming chromosomes 18 nanometre diameter ribosomes22 nanometre diameter ribosomes No ER presentER present Very few organelles, none with double membrane Double membrane bound organelles Cell Wall presentCell wall sometimes present