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A Biochemist Isolates, Purifies, and Combines in a Test Tube

question 33

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A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?


Definitions:

Idler Gear

An Idler Gear is a gear positioned between two other gears to transmit motion from one to the other, often used to change the direction of rotation or to adjust the spacing between driving and driven gears.

Direction Of Rotation

The clockwise or counterclockwise movement of a mechanical component or system as seen from a specific vantage point.

Drive Gear

Any gear that drives another.

Torque Reduction

A process or mechanism by which torque output, particularly in an engine or drivetrain, is intentionally decreased to prevent damage or improve control.

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