The Unpacking of Heterochromatin into Euchromatin Does Not Immediately Result

question 28

Multiple Choice

The unpacking of heterochromatin into euchromatin does not immediately result in DNA transcription because

• A) Barr bodies are still present.
• B) histones still block the binding of RNA polymerase to the promoter.
• C) euchromatin is always transcriptionally inactive.
• D) transcription factors still block the binding of RNA polymerase to the promoter.
• E) heterochromatin contains DNA with accessible promoters.

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Definitions:

Bathyal Zone

relates to the part of the ocean's pelagic and benthic zones that extends from the edge of the continental shelf to the abyssal zone, characterized by minimal light penetration and a diversity of specialized organisms.

Coastal Zone

The interface where the land meets the ocean, encompassing shoreline environments as well as adjacent coastal waters, characterized by its unique biological and physical attributes.

Abyssal Zone

A deep-sea environment located at depths of 4,000 to 6,000 meters, characterized by high pressure, low temperatures, and complete darkness.

Benthic Zone

The ecological region at the lowest level of a body of water such as an ocean or a lake, including the sediment surface and sub-surface layers.