Which of the Following Is Most Likely True of a Protein

question 86

Multiple Choice

Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal?

• A) Sodium and glucose bind to the same site on the cotransporter.
• B) Transport of glucose against its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient.
• C) Sodium ions can be transported whether or not glucose is present outside the cell, but glucose transport requires cotransport of sodium ions.
• D) Transport of sodium ions down their electrochemical gradient facilitates the transport of glucose against its concentration gradient.
• E) Following transport of sodium ions into the cell, the cotransporter can also transport potassium ions out of the cell.

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Definitions:

Conditioned Stimulus

A formerly neutral signal that, once it is linked with an unconditioned stimulus, ultimately evokes a conditioned response.

Unconditioned Stimulus

In classical conditioning, a stimulus that naturally and automatically triggers a response without any prior learning.

Immediate Reinforcers

Immediate reinforcers are stimuli that follow a behavior and increase the likelihood of its repetition shortly thereafter.

Delayed Reinforcers

Rewards that are not immediately given after a desired behavior, which can affect the strength of the learned behavior over time.