The Following Diagram Represents the Transcription Unit and Corresponding RNA

question 52

Multiple Choice

The following diagram represents the transcription unit and corresponding RNA transcripts as "Christmas-tree-like" structures captured in the electron micrograph.
- Which of the following statements CORRECTLY describes the reason as to why the transcription unit looks like a "Christmas tree" with different length of tree branches along the DNA "tree trunk"?

• A) Depending on where the transcription begins on the DNA template, different lengths of transcripts get generated.
• B) Each position on the DNA dictates the specific length of the RNA transcript generated from that particular position.
• C) The transcript randomly grows from the DNA without any particular reason.
• D) A single DNA can be transcribed many times continuously, and the RNA transcript gets longer as the transcription apparatus moves down the DNA.
• E) There is no known reason for the transcription unit to assume the "Christmas-tree-like" shape.

---

Definitions:

Schwann Cells

Schwann cells are a type of glial cell located in the peripheral nervous system, responsible for the formation of myelin sheaths around neurons, which helps speed up the transmission of nerve impulses.

Fascicle

A bundle of skeletal muscle fibers surrounded by connective tissue, contributing to the structure and function of muscles.

Neurofibrils

Fine, thread-like structures within neurons that provide support and nutrient transportation throughout the nerve cell.

Node of Ranvier

Gaps in the myelin sheath of a nerve fiber, allowing for rapid conduction of nerve impulses.