Where Is DNA Gyrase Normally Positioned as It Changes Positively

question 92

Multiple Choice

Where is DNA gyrase normally positioned as it changes positively supercoiled DNA into negatively supercoiled DNA in the replicating circular, bacterial chromosome?

• A)It is permanently located at the origin.
• B)It travels along the DNA behind the replication fork.
• C)It travels along the DNA ahead of the replication fork.
• D)It travels along the DNA at the replication fork as part of the replisome.
• E)It is permanently located at the termination site of replication.

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Definitions:

Metabolism

The set of life-sustaining chemical reactions in organisms to convert food into energy, and build or maintain their cells.

First Messenger

Chemical signal, such as a peptide hormone, that binds to a plasma membrane receptor protein and alters the metabolism of a cell because a second messenger is activated.

Second Messenger

Chemical signal, such as cyclic AMP, that causes the cell to respond to the first messenger—a hormone bound to a plasma membrane receptor protein.

Peptide Hormone

Type of hormone that is a protein, a peptide, a glycoprotein, or is derived from an amino acid.