问题描述：
英语翻译
1.DNA polymerase cannot start a DNA strand from scratch,so RNA primers are synthesized by a different enzyme,primase,and are later replaced by DNA.
2.Each replication origin initiates DNA replication once per cell cycle,and all DNA must be replicated for the cell to pass through the next cell cycle checkpoint.
请勿机译,
1.DNA polymerase cannot start a DNA strand from scratch,so RNA primers are synthesized by a different enzyme,primase,and are later replaced by DNA.
2.Each replication origin initiates DNA replication once per cell cycle,and all DNA must be replicated for the cell to pass through the next cell cycle checkpoint.
请勿机译,
问题解答：
我来补答展开全文阅读