Final answer:
Restriction enzymes and methylases are two different types of enzymes found in bacteria. While some bacteria have both, it is not necessary for a bacteria to have methylases if it has restriction enzymes.
Step-by-step explanation:
Restriction enzymes recognize specific DNA sequences and cut the DNA at those sites. Methylases, on the other hand, add methyl groups to the DNA at specific sites. While some bacteria have both restriction enzymes and methylases, it is not necessary for a bacteria to have methylases if it has restriction enzymes. In fact, some bacteria only have restriction enzymes without methylases. Therefore, the statement "If a bacteria has restriction enzymes, they must have methylases as well" is False.