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What is a tonoplast...

What is a tonoplast

A

Outer membrane of mitochondria

B

Inner membrane of chloroplast

C

Membrane boundary of the vacuole of plant cells

D

Cell membrane of a plant cell

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### Step-by-Step Solution: 1. **Definition of Tonoplast**: The tonoplast is a membrane that surrounds the vacuole in plant cells. It is a single membrane that acts as a boundary for the vacuole. 2. **Function of Tonoplast**: The primary function of the tonoplast is to facilitate the transport of ions and other materials into the vacuole. This transport can occur against the concentration gradient. 3. **Concentration Gradient**: The tonoplast helps maintain a higher concentration of certain substances within the vacuole compared to the cytoplasm of the cell. This is important for various cellular processes and storage functions. ...
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