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.
Well Athens diden't win the war and with that never regained her victory or leadership. Sparta won the war but didn't know what to to with the fruits of her victory and didn't really know how to lead the greeks. so I hope this helped u!
Among the people killed with a heat ray on Horsell common are <u>Martians</u>.
Horsell Common Landing Site was the first beachhead for the Martian invasion. The first projectile landed just after midnight on a Friday morning in June between the villages of Woking, Ottershaw, and Horsell in Surrey.
The projectile, first spotted by an astronomer named Ogilvy shortly after dawn on Friday, quickly became a subject of local interest because of its size and the crater it created upon impact. The tip of the was rotated all day and was completely dislodged from the inside just before 6 pm.
By this time, having cooled from the heat generated by the Earth's entry into the atmosphere, he had gathered a crowd of 200-300 people to see the first Maritan sightings. The sight of the unfamiliar and (to most people) uncomfortable Martian caused a general panic. Bystanders who fell into the crater were captured and killed by the emerging Martians.
Learn more about Martians here : brainly.com/question/644043
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The answer is D-- <span>The compromise allowed the slave trade to continue for the next 20 years.</span>
After a stressful event you may need to take a break. You should then redirect yourself to another activity, then finally reconnect yourself to whatever you were previously doing, or to those around you.
I would assume the answer is ii, based on personal knowledge.
Hope this helps!
