While investigating a gene that might be responsible for pathogen resistance in the plant Arabidopsis, you discover that many of the nucleotides in the gene sequence are methylated. Which nucleotide is MOST likely to be methylated?

Question

Quizplus · Accepted Answer

In plants, cytosine (C) is the nucleotide most commonly methylated, often in the context of CG, CHG, or CHH sequences, where H can be A, T, or C. Methylation of cytosine is a common epigenetic modification that can affect gene expression and is often involved in regulating responses to environmental stress, including pathogen resistance.

While Investigating a Gene That Might Be Responsible for Pathogen