Round 9: Tossup 16

The donation of this functional group is accomplished by a cofactor consisting of an s-adenosyl group attached to an amino acid. (15[1])The enzyme Dam in E. (15[1])coli donates this functional group, (15[1])which marks the template strand during mismatch repair. (15[1])Uracil and thymine solely differ (15[1])by the presence of this functional group. CpG islands are hotspots for the (*) addition of this functional (10[1])group near promoter sequences. Unlike the addition of an acetyl group, the addition of this functional group on histones (10[1])can either repress or active transcription. For 10 points, name this one carbon functional group symbolized CH3. ■END■ (10[1])

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