February 19, 2017

Homework Help: ap biology again

Posted by claudia on Friday, January 4, 2008 at 5:50pm.

In order to answer a question I must use this information but I find it very confusing.
The restriction enzymes of bacteria protect the bacteria from succesful attack by bacteriophages, whose genomes can be degraded by the restriction enzymes. The bacterial genomes are not vulnerable to these restriction enzymes because bacterial DNA is methylated. This situation selects for bacteriophages whose genomes are also methylated. As new strains of resistant bacteriophages become more prevalent, this in turn selects for bacteria whose genomes are not methylated and whose restriction enzymes instead degrade methylated DNA.
What I find confusing is that it is first saying that the restriction enzymes do not affect the bacteria because its genome is methylated and that the ensymes protect the bacteria well against the bacteriophage by degrading its genome but then it says that the bacteriophage's genome is also methylated so I feel it is a bit confusing. If you are able to help thank you in advance.

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