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Cell Membrane Function Quiz

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Questions and Answers

Why is the cell membrane called a selectively permeable membrane?

Because it prevents all substances from moving in and out of the cell

Because it does not allow any materials to enter or exit

Because it only permits the entry and exit of some materials (correct)

Because it allows all substances to move in and out of the cell

What is the function of the plasma membrane?

It only allows the entry of materials

It separates the contents of the cell from its external environment (correct)

It prevents the movement of all materials

It allows the entry and exit of all materials

How do substances like carbon dioxide or oxygen move across the cell membrane?

By osmosis

By facilitated diffusion

By diffusion (correct)

By active transport

What happens to CO2 inside a cell when its concentration is high?

It moves out of the cell by diffusion to a region of low concentration Signup and view all the answers

What is the role of oxygen in terms of cellular entry?

Oxygen diffuses into the cell when its internal concentration decreases Signup and view all the answers

Why is it important for the cell membrane to be selectively permeable?

To regulate which substances can enter and exit the cell Signup and view all the answers

Which process describes the movement of substances from a region of high concentration to low concentration?

Diffusion Signup and view all the answers

What substance accumulates in high concentrations inside a cell and needs to be excreted out?

Carbon dioxide Signup and view all the answers

In what direction does CO2 move when there is a concentration difference inside and outside a cell?

Out of the cell Signup and view all the answers

Which substance enters a cell by diffusion when its internal levels decrease?

Oxygen Signup and view all the answers