~convert energy
~have its own dna
~found in almost all cells
~enclosed by two membranes

(Chloroplasts)
are found in unicellular organisms such as plants, and
(Mitochondria)
 is found in almost all cells. (Chloroplasts convert light energy into sugar using photosynthesis,) and the (mitochondria converts sugar into ATP using cellular respiration.)

Both the mitochondria and chloroplast convert energy, have its own DNA, and are enclosed by two membranes.

:) Good? 

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.