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Dam or Dcm methylation can be related to what?

Answer and explanation

Correct answer: bacterial DNA methylation / Bacterial DNA methylation

Dam and Dcm refer to DNA methylation systems found in bacteria. Dam methylation commonly modifies adenine in particular recognition sequences, while Dcm methylation modifies cytosine in particular sequences. The methyl groups can affect whether a restriction enzyme recognizes or cuts a site, because some restriction enzymes are sensitive to the methylation state of their recognition sequence.

Therefore option A, bacterial DNA methylation, is correct. The terms do not describe gel colour, protein folding, or the boiling of ethanol. In a restriction-digestion experiment, the bacterial strain from which DNA was obtained can matter because its methylation pattern may change the digestion pattern. This is why methylation should be considered when an expected restriction fragment is missing or altered.

Related tags

Dam MethylationDcm MethylationBacterial Dna

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