Which of the Following Statements About Delocalized Electrons Are True

question 18

Multiple Choice

Which of the following statements about delocalized electrons are true? Select all that apply.

• A) Delocalized electrons are valence electrons that are shared between more than one pair of atoms.
• B) Delocalized electrons occupy extended sigma orbitals.
• C) Delocalized electrons are a characteristic feature of aromatic compounds.
• D) Delocalized electrons are found only in cyclic compounds.

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Definitions:

Histones

Proteins that package and order the DNA into structural units called nucleosomes.

Transcriptionally Active

Refers to genes that are currently being expressed, with their DNA being transcribed into messenger RNA.

Euchromatin

A loosely coiled chromatin that is generally capable of transcription. Compare with heterochromatin.

Heterochromatin

Heterochromatin is a tightly packed form of DNA, which makes it transcriptionally inactive, contributing to the regulation of genes and maintenance of chromosome structure.