Answer :
Crispr arrays in bacterial DNA store information from the history of the bacterial strain through the use of specific sequences called spacers. These spacers are derived from viral and plasmid DNA that the bacteria has encountered in the past.
When a bacterium is infected by a virus, it captures a piece of the viral DNA and incorporates it into its own DNA in the form of a spacer. These spacers are stored in the Crispr array, which is made up of repeated DNA sequences called repeats, interspersed with these viral spacers.
The repeats act as bookends, separating the different spacers within the Crispr array. This arrangement of repeats and spacers allows the bacterium to keep a record of its previous encounters with viruses and plasmids.
When the bacterium encounters the same virus or plasmid again, it uses a process called CRISPR-Cas to "read" the stored information in the Crispr array. The Cas proteins recognize the viral DNA and use the information from the spacers to target and destroy the invading DNA.
In summary, Crispr arrays in bacterial DNA store information from the history of the bacterial strain through the use of spacers, which are derived from viral and plasmid DNA. These spacers are arranged within the Crispr array, separated by repeated DNA sequences called repeats.
Learn more about Crispr arrays here: https://brainly.com/question/30305500
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