Restriction-Modification Systems

question 8

Multiple Choice

Restriction-modification systems:

• A) exist in all organisms as a protection against foreign DNA invasion.
• B) include a site-specific exonuclease to degrade foreign DNA.
• C) modify DNA by acetylation.
• D) include a DNA methylase and an endonuclease.
• E) include three types of endonuclease all of which cleave within a specific DNA target sequence.

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Definitions:

Pectoralis Major

The principal muscle of the chest wall.

Gluteus Maximus

The large muscle of the buttocks.

Muscular Dystrophy

A group of genetic diseases characterized by progressive weakness and degeneration of the skeletal muscles that control movement.

Duchenne's Dystrophy

A genetic disorder characterized by progressive muscle degeneration and weakness, primarily affecting boys.