Functions of cell structures

Question 1

What is the function of the cell membrane?

Answer 1

It keeps the cell contents in place.

Gases diffuse in and out through the cell membrane.

Question 2

What is the function of the nucleus

Answer 2

It controls the cell

Question 3

What is the function of the food vacuoles?

Answer 3

They secrete acids and enzymes to kill and then digest the prey.
Digested material is absorbed from the food vacuole into the cytoplasm.

Question 4

What is the function of the pseuodopdoia?

Answer 4

They extend in the direction amoeba wishes to move.
The cytoplasm moves into the pseudopodia, causing the cell to move.
They are used to surround and engulf the prey.

Question 5

As a result of the amoeba’s environment, explain the effects it has on the cell structure.

Answer 5

Amoeba live in fresh water. Its cytoplasm is more concentrated than its external environment.
Water enters amoeba by osmosis.

Question 6

What is the function of the contractile vacuole?

Answer 6

The contractile vacuole collects water that enters amoeba.

It expands, touches the cell membrane and bursts to expel the water. It is responsible for osmoregulation

Question 7

What would happen if amoeba had no contractile vacuole?

Answer 7

Without a contractile vacuole, the amoeba would expand and burst.

Question 8

List the five points of the contractile vacuole needed for a diagram.

Answer 8

1. Water enters by osmosis.
2. Excess water enters contractile vacuole.
3. Contractile vacuole swells.
4. Contractile vacuole touches the cell membrane.
5. Contractile vacuole expels excess water.