JasmineH,
Assuming that this is undergrad micro, what really helped me was thinking about the material from a deductive standpoint; what needs to be there in order for the observed phenomenon to make sense? For example, if a microbe can stand extremely hot temperatures, what has to be true about it's plasma membrane for that to make sense? The plasma membrane has to remain fluid, so the P.M. of a thermophile could be expected to have a higher degree of saturated fatty acids or we could expect a lipid monolayer, such as that of Archaea, which offers more stabilty. I also found thinking of things from a functional standpoint to be beneficial; essentially concetrating more on the why of things than the what. For instance in chemotaxis, why does CheZ need to be there is more important than what CheZ is? CheZ dephosphoryltes CheY which allows runs to occur again so that the bacterium can move accordingly. Hope this helps.
Tony