Cell Size and microscopy

Carissa Fletcher

Inter Community School

http://tysontrepidations.wordpress.com/2011/07/02/say-cheese-for-scanning-electron-microscopy/

http://tysontrepidations.files.wordpress.com/2011/07/hornet-leg-scanning-electron-microscope.jpg

2.1.4 Compare the relative sizes of molecules cell membrane thickness, viruses, bacteria, organelles and cells, using the appropriate SI unit (L3 Give an account of similarities and differences between two (or more) items, referring

to both (all) of them throughout.)

Relative sizes:1. molecules (1nm). 2. cell membrane thickness (10nm).3. virus (100nm).4. bacteria (1um).5. organelles (less 10um).6. cells (<100 um).7. generally plant cells are larger than animal cells.

http://www.cellsalive.com/howbig.htm

http://click4biology.info/c4b/2/cell2.1.htm#size

2.1.5 Calculate the linear magnification of drawings and the actual size of specimens in images of known magnification. (L2 Calculate means find a

numerical answer showing the relevant stages in the working )

I

M A

1m = 103 mm (millimetres)1m = 106 µm (micrometres)1m = 109 nm (nanometres)

I = ImageM=MagnificationA = Actual Size

Magnification X 100000

Actual Size = Image/Magnification