it is horrible essay question i've to admit, it was one of the P/P questions
if we had this essay we need to dig deep and try to make LINKS from different angles on the spec.
this is how i'll approach it
-describe the structures and functions of light and electron microscope.
-describe the structures and function of different organelles produced from electron microscope,
-choose an organelle such as mitochondria explain Glycolysis--> Link Reaction--> ETC.
-Nuclei-DNA, Trnscription--> Translation--> Ribosomes-->formation of protein
-Chloroplast-light dependent and independent
-Neurones-Describe both neurones, How Resting Potential is maintained, AP, How impulse is transmitted both non & myelinated sheath, across synapse, Neuromascular Junction.
you can go on & on, without microscope we'll never had this info.