Biology
Grade-10
Easy
Question
The imprint made up of methyl groups are added to one of the alleles on which nucleotide?
Thymine
Guanine
Cytosine
Uracil
Thymine
Guanine
Cytosine
Uracil
Hint:
Cytosine
The correct answer is: Cytosine
DNA methylation refers to the addition of a methyl group to the DNA strand itself, often to the first carbon atom of a cytosine ring.
In many cases, the imprint appears to be made up of methyl (—CH3) groups added to one of the alleles’ cytosine nucleotides. The allele may be silenced due to the methylation, which is consistent with evidence that extensively methylated genes are usually inactive.
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