Cell Membranes Flashcards

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What is the cell membrane?

The cell membrane is a thin layer that surrounds the cell and holds the cell together.

What is the main job of the cell membrane?

It controls what substances go into and out of the cell.

Where is the cell membrane found in animal and plant cells?

In animal cells it is the outer boundary of the cell. In plant cells it is just inside the cell wall.

Why is the cell membrane called partially permeable?

It is called partially permeable because it lets some substances through but stops others.

Name three substances that can move through the cell membrane.

Small molecules like oxygen, carbon dioxide and water can move through the cell membrane.

How is the cell membrane different from the cell wall?

The cell membrane is a thin flexible layer that controls movement. The cell wall is a strong outer layer in plant cells that gives support and is fully permeable.

What is another name for the cell membrane?

Another name for the cell membrane is the plasma membrane.

What is the cell membrane made from in simple terms?

It is mainly made from a double layer of fat molecules with proteins in it.

Why do mitochondria and chloroplasts have their own membranes?

Their membranes keep their reactions separate from the rest of the cell and control what goes in and out of them.

What role do proteins in the cell membrane have?

Some proteins form channels to help substances cross the membrane and some act as receptors to detect signals.