Different Modification of the Histone Have Different Effects on Gene

question 17

Multiple Choice

Different modification of the histone have different effects on gene expression.For instance,the ninth amino acid of histone 3 is a lysine H3K9) can be acetylated once or methylated up to three times.Which of the following is true regarding H3K9 modification?

• A)If H3K9 has two methyl groups,then the gene will be activated.
• B)If H3K9 has three methyl groups,then the gene will be repressed.
• C)If H3K9 is acetylated,then the gene will be repressed.
• D)If H3K9 has three methyl groups,it is maximally activated compared to only having one methyl group.
• E)If H3K9 has a single methyl group,then the gene will be repressed.

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Definitions:

Spontaneous Recovery

Refers to the reappearance of a previously extinguished response after a period of no exposure to the conditioned stimulus.

Latent Learning

The process of learning that occurs without any obvious reinforcement of the behavior or associations that are learned.

Unconditioned Stimulus

In classical conditioning, a stimulus that naturally triggers a response without any need for prior learning.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, elicits a conditioned response.