Posts Tagged ‘molecules’

Size DOES matter!

Thursday, August 12th, 2010

H1N1 virus by AJC1 on flickr

You need to compare the relative sizes of molecules, cell membrane thickness, viruses, bacteria, organelles and cells using appropriate SI units.  Here’s a useful link to help get the concepts across.  And another here.

Calculate the linear magnification of drawings and the actual size of specimens in images of known magnification.  We’ll get some practice at this in class using the microscopes.

Explain the importance of the surface area to volume ratio as a factor in limiting cell size.  A good diagram explaining SA/vol ratio can be found here.  As this is a really important concept, we’ll be doing a lab on it.  Read the handout for the method. SA to vol ratio LAB IBH1 Biology