The correct answer is Battle of Gettysburg
During the United States' secession war, the Battle of Gettysburg was the turning point in the fortunes of the war. After an unforeseen victory by the northern forces (union), the confederate states went on to a defensive war that led to defeat. The battle was immortalized by the heroism of soldiers and units on both sides, reaching immortality in American and military history, and to this day it is the biggest battle on the American continent.
The first description of the DNA (deoxyribonucleic acid)chain was done by Watson and Crick in 1953, the nucleotides that constitute the DNA are four: cytosine (C), guanine (G), timine (T) and adenine (A). When doing a model is essential to remember that cytosine ONLY joins guanine and timine only link adenine, this is due to the size and chemical properties of each molecule. Later, another related and similar and molecule was discovered, the ribonucleic acid or RNA, which also is constructed by nucleotides.
In both cases, the nucleotides are compound of 3 main components: a nitrogen base, a pentose and a phosphate. When the molecule lacks the phosphate group, is called nucleoside. Depending on the chain ( DNA or RNA) the nitrogen base derives from purine (adenine and guanine) or pyrimidine (cytosine or timine) just in the RNA instead of timine is uracil (U)
The union is established between adjacent molecules through the phosphate, while among each other through the nitrogen base-remember C=G and T or U=A. The core of each molecule is the pentose. Therefore the best representation of the molecule is attached
References
Watson, J. D., & Crick, F. H. (1953, January). The structure of DNA. In Cold Spring Harbor symposia on quantitative biology (Vol. 18, pp. 123-131). Cold Spring Harbor Laboratory Press.
1500 kilograms?? or another unit?
The correct answer is the guilty knowledge test.
It is a test done on a polygraph or lie detector which is supposed to be absolutely correct as it shows knowledge that only a guilty person might possess. An example would be if a suspect is asked to read the names of several weapons out loud and if the lie detector consistently shows a reaction when it comes to one particular weapon, it means that the suspect knows something he or she is not telling.