Final answer:
When a guanine is attached to another molecule and a methyl group transfers, it can form different compounds like methylguanine or a methyl guanosine cap on mRNA.
Step-by-step explanation:
When a guanine is attached to another molecule and a methyl group transfers, it can form different compounds depending on the specific reaction. One possible compound that can be formed is methylguanine.
Methylation of guanine bases is a type of DNA damage that can be reversed by certain proteins like methylguanine methyl transferase (MGMT). Another example is the addition of a methyl guanosine cap to an mRNA molecule, which helps the mRNA leave the nucleus and associate with ribosomes.