Molecules and atoms are much, much smaller than a bacterial cell. The molecular level basically means that you are talking about things in the size range of most molecules and not any bigger.Of course there are molecules of very different sizes, but the point is that you are looking at something at a scale where you would see molecules and not not larger structures like crystals.olecules and atoms are much, much smaller than a bacterial cell. The molecular level basically means that you are talking about things in the size range of most molecules and not any bigger.
If mismatch repair isn't working, cells will accumulate mutations really quickly because any mistakes in DNA replication aren't being fixed. All those mutations can lead to various types of cancer, including colon cancer, ovarian cancer, stomach cancer, breast cancer, lung cancer... the list goes on and on.
The DNA at the very end of the chromosome cannot be fully copied in each round of replication, resulting in a slow, gradual shortening of the chromosome. Why is this the case? When DNA is being copied, one of the two new strands of DNA at a replication fork is made continuously and is called the leading strand. The other strand is produced in many small pieces called Okazaki fragments, each of which begins with its own RNA primer, and is known as the lagging strand.