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:
A screen addiction (Tbh I have the same addiction)
Answer:
Development is the result of society's capacity to organize resources to meet challenges and opportunities. Society passes through well-defined stages in the course of its development. ... Productivity of resources increases enormously as the quality of organization and level of knowledge inputs rise.
Explanation:
Please Mark me brainlist
The correct answer is sex and gender. It is because the
criteria of female is being established as a basis for the admission signals by
which is fundamentally, sex—the biological difference between a male and a
female of which is at stake. However, Gender, it is the social aspect of how an
individual express his or herself based on the context of sex or sexuality.
The correct answer is associative/ fictive kin.
Associative kin refers to a relationship between individuals, where they are not related by blood or family ties, yet, their bond is akin to that of family members or close relatives. Associative kin are likely to spend holidays together, vacation together and see each other regularly. In this instance, Marie shares an associative kin relationship with Danny and Karen's family since they have a close bond.