Why Did Kornberg Initially Think That the Exonuclease Activity He

question 22

Multiple Choice

Why did Kornberg initially think that the exonuclease activity he found in his DNA polymerase preparations was a contaminating enzyme?

• A)The action of exonucleases is a lot like endonuclease.
• B)The action of exonucleases is so dramatically opposed to the activity of DNA polymerases,the synthesis of DNA.
• C)The action of exonucleases is exactly like the action of DNA polymerase.
• D)Purification was so difficult.
• E)Enzymes can often run the reverse reactions.

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Definitions:

Epithelial

Pertaining to the epithelium, a layer of cells covering the body surfaces, lining body cavities and forming many glands.

Connective

Often refers to connective tissue in biology, which supports, binds together, or separates other tissues or organs of the body.

Mucus

A slippery secretion produced by, and covering, mucous membranes primarily in the respiratory, digestive, and reproductive systems, aiding in protection and lubrication.

Muscle

Muscle is a tissue in animals that contracts to produce movement, consisting of smooth, skeletal, and cardiac types.