The genetic switch involves acetylation, the introduction of an acetyl group into a molecule at the DNA level of chromatin resulting in genetictranscription.
基因“开关”涉及乙酰化作用，也就是将乙酰基群在染色质的DNA水平上引入到分子中，由此完成基因转录。
2
Transcription is the first major step in gene expression, and constitutes an important point of genetic information flow.
基因转录是遗传信息传递和表达的枢纽，是基因表达调控机制发挥作用的重要环节。
3
Functional aspects of nuclear: : It is the largest organelle in the cell and the place for genetic storage, replication and transcription.