Whats are the fundamental units of matter called

These are known as atoms. There are also particles, which are even smaller, but atoms are what matter is composed of.
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Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.

To see a general view of a microscope slide, use low power. to see a more specific and detailed view, use high power.