In a Series of Experiments, the Enzyme Dicer Has Been

question 89

Multiple Choice

In a series of experiments, the enzyme Dicer has been inactivated in cells from various vertebrates, and the centromere is abnormally formed from chromatin. Which of the following is most likely to occur?

• A)The usual mRNAs transcribed from centromeric DNA will be missing from the cells.
• B)Tetrads will no longer be able to form during meiosis I.
• C)Centromeres will be euchromatic rather than heterochromatic and the cells will soon die in culture.
• D)The cells will no longer be able to resist bacterial contamination.
• E)The DNA of the centromeres will no longer be able to replicate.

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Definitions:

Secondary Reinforcement

An event that has developed its reinforcing properties through its association with primary reinforcements.

Tertiary Reinforcement

A type of reinforcement that is not inherently rewarding but is associated with primary or secondary reinforcers, such as money for humans.

Computational Reinforcement

Involves the application of computational models and algorithms to understand or implement reinforcement learning processes.

Variable-Ratio Schedule

A reinforcement schedule in which a response is rewarded after an unpredictable number of responses, leading to high and steady rates of response.