Use the Following Information to Answer the Question(s) Below

question 23

Multiple Choice

Use the following information to answer the question(s) below.
Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and, therefore, can be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides and introduced these into the culture of dividing human cells at specific times.
-The research team used their experiments to study the incorporation of labeled nucleotides into a culture of lymphocytes and found that the lymphocytes incorporated the labeled nucleotide at a significantly higher level after a pathogen was introduced into the culture. They concluded that ________.

• A) the presence of the pathogen made the experiments too contaminated to trust the results
• B) their tissue culture methods needed to be relearned
• C) infection causes lymphocytes to divide more rapidly
• D) infection causes cell cultures in general to reproduce more rapidly
• E) infection causes lymphocyte cultures to skip some parts of the cell cycle

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Definitions:

Cognitive Map

An internal psychological representation of the spatial layout of the external world.

Discriminative Stimulus

A specific stimulus in the presence of which a particular response is more likely to be reinforced.

Fixed-Interval Schedule

In operant conditioning, a reinforcement schedule that reinforces a response only after a specified time has elapsed.

Latent Learning

Latent learning is the process by which knowledge is acquired without any immediate manifestation of learned behavior or obvious reinforcement.