To protect Constantinople from the Germans, the Emperor Theodosius II, built in the fifth century a triple wall about 12 meters high that surrounded the city
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.
If your choices are the following:
<span> A) The United States were members of the League and were immediately involved.
B) The United States would only provide economic aid to their allies on a lend-lease policy.
C) The United States had reverted to a policy of isolationism, and therefore remained neutral.
D) The United States supported both sides with weapons under a cash and carry policy.
Then the answer is </span>C) The United States had reverted to a policy of isolationism, and therefore remained neutral
Answer:
<h2>German Samoan </h2>
Explanation:
<h2>Hope it will help you.</h2>