An IgG antibody that specifically recognizes a protein of interest, p50, was used to isolate p50 from a whole‑cell lysate. The resulting protein mixture can undergo SDS-PAGE to separate p50 from IgG. The molecular weight of p50 is 50 kDa,50 kDa, and the protein does not contain any cysteine residues. The molecular weight of IgG is 160 kDa.160 kDa. IgG contains two heavy chains and two light chains that weigh 50 kDa50 kDa and 25 kDa,25 kDa, respectively. Both types of chains contain cysteine residues. Select the components of the SDS‑PAGE loading buffer. a. bromophenol blueb. dithiothreitolc. glycerold. sodium dodecyl sulfatee. sodium chloride

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law