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英语翻译1.DNA polymerase cannot start a DNA strand from scratch,

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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聚合酶不能从头开始合成DNA,所以RNA的引物是由不同的酶,引物酶合成,然后才由DNA替换
2.每次原细胞分裂dna复制一次且占一个从细胞周期,所有的DNA必须在下个细胞周期到来前被复制到分裂的细胞中