The Plasma Membrane of a Cell and the Membrane Boundaries

question 52

Multiple Choice

The plasma membrane of a cell and the membrane boundaries of organelles,such as mitochondria and chloroplasts,serve similar functions.What is one of the main functions of the membranes of both cells and organelles?

• A) They keep reactants near each other to speed biological reactions.
• B) They allow external chemicals to diffuse freely into and out of the cell.
• C) They encourage cellular respiration at the membrane boundaries.
• D) They keep water out of the cell and organelle interiors.

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