What Is the Energy Cost of the C4 Pathway

question 44

Multiple Choice

What is the energy cost of the C4 pathway?

• A) 30 molecules of ATP are used per hexose molecule made.
• B) 18 molecules of ATP are used per hexose molecule made.
• C) 30 molecules of NADPH are used per hexose molecule made.
• D) 18 molecules of ATP and 12 of NADPH are used per hexose molecule made.
• E) None of the above.

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Definitions:

Exocytosis

A cellular process in which intracellular vesicles fuse with the plasma membrane to release their contents outside the cell.

Adhesion Junctions

Specialized structures in cells that help in the binding of cells with each other or with the extracellular matrix.

Gap Junctions

Specialized intercellular connections that facilitate the direct transfer of ions and small molecules between the cytoplasms of adjacent cells.

Tight Junctions

Specialized connections between neighboring cells that create a barrier to prevent the leakage of molecules across cell layers.