As Part of an Experiment, Researchers Grew Several Different Types

question 58

Multiple Choice

As part of an experiment, researchers grew several different types of cells in the presence of radioactive iodine. After some time had passed, the cells were washed, and the levels of iodine inside the cell were determined. What is the most plausible explanation for why some cells had higher levels of radioactivity after treatment than others?

• A) Cells that had high radioactivity levels after treatment contain iodine transporters.
• B) Cells that had high radioactivity levels after treatment lack iodine transporters.
• C) Cells that had high radioactivity levels after treatment had a mutation in genes encoding iodine transporter proteins.
• D) Cells that had high radioactivity levels after treatment lack clathrin.
• E) Cells that had high radioactivity levels after treatment lack lysosomes.

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Definitions:

Classical Conditioning

The approach of training through the habitual pairing of two stimuli; originally, the second stimulus induces the response, which later is induced by the first stimulus solely.

Extinction

In psychology, the diminishing of a conditioned response, typically when the reinforcement or stimulus that originally led to the response is removed.

Original Learning

The initial phase of acquiring new knowledge or skills where fundamental concepts and principles are established.

Classical Conditioning

Learning occurs through consistently pairing two stimuli together; a reaction first stimulated by the second stimulus eventually is stimulated by only the first stimulus.