Transcript of Timeline of Educational Reform. U.S. Supreme Court announces its decision in the case of Brown v. Board. of Education of Topeka, ruling that separate educational facilities are inherently unequal, thus overturning its previous ruling in the 1896 case of Plessy v. Ferguson.
The antiparallel structure of DNA is important in DNA replication because it replicates the leading strand one way and the lagging strand the other way. During DNA replication the leading strand is replicated continuously whereas the lagging strand is replicated in segments known as Okazaki fragments.
Telomeres need to be protected from a cell's DNA repair systems because they have single-stranded overhangs, which look like damaged DNA. The overhang at the lagging strand end of the chromosome is due to incomplete end replication (see figure above). The overhang at the leading strand end of the chromosome is actually generated by enzymes that cut away part of the DNA 1 ^1 1 start superscript, 1, end superscript. In some species (including humans), the single-stranded overhangs bind to complementary repeats in the nearby double-stranded DNA, causing the telomere ends to form protective loops 3 ^3 3 start superscript, 3, end superscript.