How does a bacterial cell protect its own DNA from restriction enzymes?
A. by adding methyl groups to adenines and cytosines
B. by reinforcing bacterial DNA structure with covalent phosphodiester bonds
C. adding histones to protect the double-stranded DNA
D. by forming "sticky ends" of bacterial DNA to prevent the enzyme from attaching
E. using DNA ligase to seal the bacterial DNA into a closed circle
Ans: A. by adding methyl groups to adenines and cytosines
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