Which of the Following Statements Is Most Likely True of a Protein

question 45

Multiple Choice

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

• A) Sodium and glucose compete for the same binding site in the cotransporter.
• B) Glucose entering the cell down its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient.
• C) Sodium ions can move down their electrochemical gradient through the cotransporter whether or not glucose is present outside the cell.
• D) A substance that blocks sodium ions from binding to the cotransport protein will also block the transport of glucose.

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