A methyl group is a basic unit in organic chemistry: one carbon atom attached to three hydrogen atoms.

甲基是有机化学的基本单位：一个碳原子连接三个氢原子。

youdao

Much is known about the "fifth base, " 5-methylcytosine, which arises when a chemical tag or methyl group is tacked onto a cytosine.

此前，科学家们已对第5种碱基有所了解——当一个化学标签或甲基被固定到一个胞嘧啶上时，第5种碱基就会出现。

youdao

In healthy cells a compound called a methyl group is tagged to DNA where it ACTS as a "red light", preventing certain genes from producing proteins.

在正常细胞中，甲基作为DNA标记的一个“红灯”，阻止某些基因合成蛋白质。

youdao

Any time you see a c h 3, this means a methyl group.

一旦你看到一个，C，H，3，的组合，这就意味着一个甲基。

麻省理工公开课 - 化学原理课程节选

C H 3 So any time you see c h 3 here, remember that that's methyl and that's going to be a terminal group.

因此一旦你看到，记得这就是甲基,而且只能在结构的末端。

麻省理工公开课 - 化学原理课程节选

This is the process by which DNA is chemically altered by the addition of a methyl group (a carbon atom and three hydrogens) to genetic letter C.

ECONOMIST: Genomics has not yet delivered the drugs, but it will

Eugenol, a methoxyphenol found in various essential oils such as clove, bay laurel, cinnamon leaf, and rosemary, appears to be a particulary effective peorxynitrites scavenger (the methyl group binds to peroxynitrites and the phenol group converts it into water and a nitrogen dioxide anion).

FORBES: The Lessons Of Failure: What We Can Learn From Bapineuzumab's Blowup