Since the Parental Double Helix Must Rotate 360° to Unwind

question 28

Multiple Choice

Since the parental double helix must rotate 360° to unwind each gyre of the helix,during the semi-conservative replication of the bacterial chromosome,some kind of "swivel" must exist.What do geneticists now know that the required swivel is?

• A) Topoisomerase
• B) Helicase
• C) A transient single-strand break produced by the action of topoisomerases
• D) A transient single-strand break produced by the action of helicases
• E) A transient single-strand break produced by the action of Ligase

---

Definitions:

PDF File

A file format developed by Adobe that captures and displays documents in a layout-independent manner.

Duplicate Button

A user interface element that allows users to easily make a copy of an item, such as a file or a piece of data.

Table Row

A horizontal group of cells in a table, often used to represent a single record or line item in a dataset.

Style Set

A collection of styles and formatting options that can be applied to documents in word processing software to ensure consistency in design.