Q:

What is a cell boundary called?

A:

Quick Answer

The cell boundary is called the cell membrane. In plant cells, it is called the cell wall, and it is made of cellulose. The cell membrane separates a cell from its surroundings.

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Full Answer

The cell membrane provides structure and form to the cell. It encloses the vital cell organelles and the dense jelly-like substance called the protoplasm. It protects the cell from the harsh environment outside the cell. The cell membrane is porous, allowing the exchange of gases, nutrients and excretory products. It is made up of proteins and phospholipids. These proteins and lipids are layered to give the membrane a bi-layered structure.

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Related Questions

  • Q:

    What does a cell wall do?

    A:

    The cell wall of plants is a tough, yet flexible layer that surrounds the cell membrane. It has many functions, but its main function is to give the plant cell rigidity and strength.

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  • Q:

    What is the difference between the cell wall and the cell membrane?

    A:

    Unlike the cell membrane, the cell wall is not common to all types of cells. A protective layer that surrounds the cell membrane, one of its main functions is to prevent over-expansion of a cell.

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  • Q:

    Why is the cell membrane said to be selectively permeable?

    A:

    The cell membrane is said to be selectively permeable because it lets certain substances pass through while restricting the passage of others. The actual structure of the cell membrane allows free passage or restricts movement of substances across the membrane. Three ways in which the cell membrane controls the movement of substances is simple diffusion, facilitated diffusion and active transport.

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  • Q:

    What are the different parts of an animal cell?

    A:

    An animal cell contains a nucleus, cytoplasm that contains the various organelles and a cell membrane, also called a plasma membrane. The nucleus is the largest of the organelles and governs cell activity. It also contains chromosomes, made up of tiny strands of DNA that replicate when the cell divides.

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