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Cell cycle:
G1 ­ the cell grows and organelles are copied.
S ­ DNA is copied and checked for any mutations.
G2 ­ the cell grows some more.
M ­ Nuclear division (mitosis or meiosis).

Different types of microscopes can reach different magnifications, and show different type of

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a large surface area to provide more space for molecules to pass through (this is often achieved by
folding the walls and membranes of the surface for exchange)
a thin barrier to the surface to reduce the diffusion path
(ventilating the lungs) a fresh supply of molecules on one side…


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