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.
The answer you are looking for in CONFIDENTIALITY <span />
Answer:
There's a lot of pros and cons of remote learning. The most cons I can really think of would be.
-Bad mental state
-Not being watched or forced to do work which would cause bad and low grades.
Explanation:
Answer: This excerpt is from the book The Great Gatsby written by written by American author F. Scott Fitzgerald.
In the book, the indication that Tom and Daisy are closely linked despite their marital difficulties is that Tom and Daisy are both quite set in their ways, are so used to wealth and living a luxurious life. They both belong to the "secret society", and do not associate much with the lower class.