Taiga is a biome consisting of evergreen trees (needle-bearing trees). Where is taiga found?

A. northern parts of Mexico

B. southwestern parts of Canada

C. northeaster states such as Maine

D. midwestern states such as Kansas

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.