The electron transport chain is located on the inner membrane of the mitochondria, as shown below. The electron transport chain contains a number of electron carriers. These carriers take the electrons from NADH and FADH2, pass them down the chain of complexes and electron carriers, and ultimately produce ATP.
There is 2 sets of chromosomes in a regular/somatic cell. In this case chimpanzee have 48 total in each regular cell which means their sex cells/haploid cells have half of that which would be 12 chromosomes. (Haploid cells only have one set of chromosomes)
Scientists can address bias in their studies by simply measuring with a certain group. The scientist will not address the any other groups which is what makes the situation biased. Also, a scientist can only state his/her opinions and not acknowledge any other previous research. Hope this helped :))