What Is a Distinguishing Characteristic Between Class I and Class

question 27

Multiple Choice

What is a distinguishing characteristic between Class I and Class II aminoacyl-tRNA synthetases?

• A) Class I enzymes are ligases, while Class II enzymes are lyases.
• B) Class I enzymes have proofreading, while Class II enzymes do not.
• C) Class I enzymes bind to specific nucleotides in tRNA substrates, while Class II enzymes do not.
• D) Class I enzymes transfer amino acids to the 2´ OH, while Class II enzymes transfer amino acids to the 3´ OH.
• E) None of the answers is correct.

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Definitions:

Alarm Stage

The initial phase of the stress response, where the body recognizes a threat and prepares to face or flee from it.

Selye's General Adaptation Syndrome

A model describing the body's physiological response to stress through various stages: alarm reaction, stage of resistance, and stage of exhaustion, highlighting the body's attempt to adapt to stress.

Parasympathetic Nervous System

A division of the autonomic nervous system that conserves energy by slowing the heart rate and increasing intestinal and gland activity, facilitating a state of rest and digest.

General Adaptation Syndrome

A three-stage response (alarm, resistance, exhaustion) that describes the body's short-term and long-term reactions to stress.