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.

Understand the structure and function of ribosomes in protein synthesis.

Describe the mechanisms of cellular respiration and energy production in mitochondria.

Illustrate the composition and function of the nuclear envelope, including nuclear pores.

Compare and contrast the characteristics and functions of free and attached ribosomes.

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Definitions:

Classical Conditioning

A fundamental learning technique that involves associations between an environmental stimulus and a naturally occurring stimulus.

Unconditioned Response

A natural, unlearned reaction to an unconditioned stimulus.

Conditioned Stimulus

A formerly neutral stimulus that, after association with an unconditioned stimulus, comes to produce a conditioned response.

Conditioning Procedure

A process in behavioral psychology used to establish a new response to a stimulus by association with a secondary stimulus.