精美通用ppt模板彩色團(tuán)隊(duì)領(lǐng)導(dǎo)主題(編輯修改稿)
2024-08-28 16:00 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 be capable of incorporating the usually poisonous element arsenic in its DNA.[41] This discovery may lend weight to the longstanding idea that extraterrestrial life could have a different chemical makeup from life on Earth.[41][42] The research was carried out by a team led by Felisa WolfeSimon, a geomicrobiologist and geobiochemist, a Postdoctoral Fellow of the NASA Astrobiology Institute with Arizona State University. This finding has, however, faced strong criticism from the scientific munity。 scientists have argued that there is no evidence that arsenic is actually incorporated into biomolecules.[42][43] Independent conformation of this finding has also not yet been possible. 樣例文本 C ? 一般來(lái)說(shuō)，當(dāng)一段脫氧核糖核酸序列為合成信使 RNA（ mRNA，可轉(zhuǎn)譯成蛋白質(zhì)）所需時(shí)，稱為“正意”。而相對(duì)并互補(bǔ)的另一股序列，則稱為“反意”。由于 RNA聚合酶的作用方式，是根據(jù)模板上的訊息來(lái)合成一段與模板互補(bǔ)的 RNA片段，因此正意 mRNA的序列實(shí)際上與脫氧核糖核酸上的反意股相同。在同一股脫氧核糖核酸上，可能同時(shí)會(huì)有屬于正意和反意的片段。此外，反意 RNA在原核生物或真核生物體內(nèi)皆存在，但是其功能尚未明了 [21]。有研究認(rèn)為，反意 RNA可利用 RNA與 RNA之間的堿基配對(duì)，來(lái)調(diào)控基因的表現(xiàn)
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