viruses - nucleic acid with a protein coat

once you reach 10nm, they are no longer cells/viruses, they are protein, lipid, molecule and atoms

microscopy is the tool to study cells!!!!

light microscopy use light to visualize cells

• bright field, quick and easy form of microscopy
• stained bright field microscopy is clearer, but kills cells
• faze contrast microscopy, takes advantage of the substance within the cells and you can see them via light refractions
• fluorescence microscopy, uses fluorescent substances see the structure of a cell (where the mitochondria is haha) specific color shows us what you want identified
• confocal microscopy, looks at indiv. layers

electron microscopy

• electron beams to generate image
• gets into the nitty gritty (like viruses)
• can only visualize alive organisms/cells with electron microscopy
• transmission electron microscopy, looks into the inside of the cells
• scanning electron microscopy, scans the outside of a cell