關於專業和學術領域的東西，我想我還是出來說幾句吧。
希望大家能夠心平氣和地思考問題，不要因為政治觀念的不同，而影響學術判斷。
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1,
Nucleic acids (DNA and RNA), are composed of carbon, oxygen, hydrogen, nitrogen, and phosphorus. 是身體裏最大結構分子。而組成DNA and RNA的基本結構單位成為核苷酸- Nucleotides
2，每一個核苷酸Nucleotides由三個部分組成：a nitrogenous base (also known as nucleobase), a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group.
3， 決定核苷酸Nucleotides的區別性就在於這個nitrogenous base。這個 nitrogenous base, which can be either Adenine, Guanine, Cytosine, or Thymine (in the case of RNA, Thymine is replaced by Uracil). 我們簡稱這些nitrogenous base為： A, G, C, T, U
4，無數的核苷酸Nucleotides組成了一個chain (beads), 這個chain，也叫做strand.
Double stranded, forms a double helix 形狀的是DNA，我們叫它DNA chain, or a DNA strand。
Single stranded (except in rare cases), can fold into complex 3D shapes, is relatively unstable and can leave the nucleus，就是RNA。
4，DNA and RNA are both strings of chemical building blocks called nucleotides (核苷酸）. And these nucleotides spell out a genetic code.
5，
For example, the DNA string "TATACGAAA" transcribes into the RNA string "UAUACGAAA", which in turn translates into the amino acid string "Tyr-Thr-Lys“ （氨基酸 string）
6，如果RNA string 的pattern改變了，基因code也會改變。RNA病毒變異快，也就不難理解了。
謝謝大家的耐心：）
