The integrity of DNA and RNA is essential for every cell. DNA contains the genetic information for proteins, while RNA serves ...

IT之家 3 月 18 日消息，生命究竟如何在地球上起源？这是科学界最大的未解之谜之一。一个被广泛接受的理论是，生命通过化学演化过程开始。不过也有科学家提出，小行星和彗星可能曾将诸如核碱基之类的有机分子运送至地球。

据英媒3月21日报道，科学家在研究一颗小行星的尘埃时，发现了在地球上创造生命所需的所有基本构成要素。日本一项任务显示，从位于约2亿英里外的小行星“龙宫”上采集的物质，包含了构成地球上每个生物体内DNA和RNA的五种化学“字母”——即核苷酸。这些样本由 ...

Our genes contain all the instructions our body needs to function, but their expression must be finely regulated to guarantee that each cell performs its role optimally. This is where DNA and RNA ...

Ribonucleic acids (RNAs) serve as messengers between DNA and protein production, and perform a wide variety of regulatory functions across different cellular processes. This makes them an interesting ...

Add Yahoo as a preferred source to see more of our stories on Google. Double-strand breaks in DNA can be deadly. Victor Golmer/iStock via Getty Images Plus Your DNA is continually damaged by sources ...

据发布在《自然-天文学》的一篇论文，科学家在研究龙宫小行星样本时，在样本中发现了地球DNA和RNA中存在的全部五种核碱基。

DNA from a distance ...

Scientists have discovered all five nucleobases that make up DNA and RNA in samples collected from the asteroid Ryugu. This ...