Ask Question
6 April, 21:29

The Energetics of Coupled Transport

Sucrose concentration is higher in the cytoplasm than in the extracellular environment. Na + concentration is higher in the extracellular environment than in the cytoplasm. Animal cells can take up sucrose against its concentration gradient using a Na+/sucrose symporter. Indicate if the following statements are true or false.

A. In the Na+/sucrose symporter, Na + is also moving against its concentration gradient.

B. For the symporter to work, the cell must first establish a Na + concentration gradient.

C. A symporter works by making the phospholipid bilayer more permeable to ions and sucrose.

D. Moving sucrose against its concentration gradient is a form of active transport.

E. A Na+/sucrose antiporter would be capable of moving sucrose into the cell while moving Na + out of the cell.

F. Since the Na+/sucrose symporter exchanges a single sucrose for a single Na+, it can also be considered a uniporter

+2
Answers (1)
  1. 6 April, 21:53
    0
    A. False - A symporter system requires that one of the molecules to be transported using passive transport.

    B. True - The Na + will move down the established concentration gradient releasing energy to facilitate movement of sucrose against its concentration gradient. This is known as secondary active transport.

    C. False - sucrose moves through ion channels not by diffusion to better control its movement across the membrane.

    D. True - Movement of molecules against their concentration gradient thus requiring energy input is known as active transport.

    E. False - One of the molecules needs to be moving against its concentration gradient.

    F. False - A Uniporter system allows the binding and transport of a single molecule at a time. A symporter allows simultaneous binding and transport of Na + and sucrose molecules.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “The Energetics of Coupled Transport Sucrose concentration is higher in the cytoplasm than in the extracellular environment. Na + ...” in 📗 Biology if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers