Use the following information when answering the corresponding questions).
A study by Krings et al. investigated Neanderthal DNA by amplifying 30 000- year- old samples and sequencing it. M. Krings Stone, R.W. Schmitz, H. Krainitzki, M. Stoneking, and S. Pääbo. 1997. Neandertal DNA sequences and the origin of modern humans. Cell 90:19- 30).
Here is part of the lead paragraph in the "Methods" section of the Krings et al. paper:
Protective clothing was worn throughout the sampling procedure. Instruments used were treated with 1 M HCl followed by e rinsing in distilled water. After removal, the sample was immediately put into a sterile tube for transport to Munich. All subse manipulations of the sample, and experimental procedures prior to cycling of PCR reactions, were carried out in laboratories dedicated to the analysis of archaeological specimens, where protective clothing, separate equipment and reagents, UV irradia other measures to...
A concluding paragraph of the Krings et al. paper states:
It must be emphasized that the above conclusions are based on a single individual sequence; the retrieval and analysis of mtD sequences from additional Neanderthal specimens is obviously desirable. If this proves possible, then the potential exists to address several questions concerning Neanderthals that hitherto could be studied exclusively by morphological and archaeological approaches. For example, the genetic relationship between Neanderthal populations in Europe and in western Asia could be explored, as could the demographic history of Neanderthal populations.
-How could the "demographic history of Neanderthal populations" be explored if mitochondrial DNA from other Neanderthal samples could be PCR amplified?
A) These Neanderthal sequences could be compared to each other to see how much they differ; the more they differ, the greater the divergence between these populations.
B) In the attempt to amplify other Neanderthal DNAs, those that amplify must be from more modern populations and those that don't are from more ancient populations.
C) These Neanderthal sequences could be compared to those of modern humans to learn if they are closely related.
D) These Neanderthal sequences could be compared to those of modern humans; the more they differ, the more distant the time of divergence between the Neanderthal and modern human lineages.

The Final Step in a DNA Sequencing Reaction Is to Run

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