Question

Several students have been practicing drawing their models of nucleotides. Whose model do you think is most consistent with the actual chemical structure of nucleotides

Answer 1

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.

Answer 2

It would be the Markov models of DNA sequence. Markov model is the most consistent with the actual chemical structure of nucleotides where it also becomes the most-used model.  

EXPLANATION:  

Here is the matrix of nucleotides structure model by Markov:

 

Beside Markov, there are other models of chemical structure of nucleotides proposed by other scientists.

1. JC69 model (Jukes and Cantor 1969)

2. K80 model (Kimura 1980)

3. F81 model (Felsenstein 1981)

4. HKY85 model (Hasegawa, Kishino and Yano 1985)

5. T92 model (Tamura 1992)

LEARN MORE:  

If you’re interested in learning more about this topic, we recommend you to also take a look at the following questions:

1. Which of the following would a chemist be most likely to study?  brainly.com/question/856697  

KEYWORDS: structure of nucleotides, what is the structure of nucleotides, nucleotides  

Subject: Social studies

Class: 10-12

Sub-chapter: Structure of nucleotides  

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