Chapter 4 Quiz 2

The steeper the concentration gradient, the higher is the rate of diffusion.

• True

• False

A cell membrane must be present for osmosis to take place.

• True

• False

When a cell is placed in an isotonic solution, the movement of water molecules stops.

• True

• False

When a plant cell is placed in a hypotonic solution, it loses water by osmosis and becomes plasmolysed.

• True

• False

Active transport involves some proteins present in the cell membrane called carrier proteins.

• True

• False

The rate of active transport is affected by temperature and availability of oxygen.

• True

• False

Which of the following transport mechanisms require a membrane to take place??

(1) diffusion

(2) osmosis

(3) active transport

(4) phagocytosis

• (1) and (2) only

• (3) and (4) only

• (2), (3) and (4) only

• (1), (2), (3) and (4)

Which of the following transport mechanisms require energy?

(1) diffusion

(2) osmosis

(3) active transport

(4) phagocytosis

• (1) and (2) only

• (3) and (4) only

• (2), (3) and (4) only

• (1), (2), (3) and (4)