Which of the Following Is an Example of an Epigenetic

question 22

Multiple Choice

Which of the following is an example of an epigenetic change in eukaryotes?

• A)A loss of an AT base pair from a gene
• B)The addition of methyl groups to cytosines in the promoter region of a gene
• C)The substitution of an AT base pair by a GC base pair in a gene as a result of a mistake during DNA replication
• D)A deletion that simultaneously removes two genes from the genome
• E)None of the above represents epigenetic changes.

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Definitions:

Bronsted-Lowry Base

A substance that can accept a proton (H+) from another substance, according to the Bronsted-Lowry acid-base theory.

Lewis Base

A Lewis base is a substance that can donate a pair of electrons to form a covalent bond in a chemical reaction.

Nucleophile

A chemical species that donates an electron pair to an electrophile to form a chemical bond in reaction mechanisms.

Electron-Pair Acceptor

A chemical entity that readily accepts a pair of electrons from another species to form a covalent bond, also known as a Lewis acid.