Facilitated diffusion differs from simple diffusion in that:
Facilitated diffusion requires membrane proteins, while simple diffusion does not.
Facilitated diffusion moves substances against their concentration gradient, while simple diffusion moves them down their concentration gradient.
Facilitated diffusion requires energy expenditure, while simple diffusion does not.
Facilitated diffusion occurs only in plant cells, while simple diffusion occurs in all cells.
Related Questions
Diffusion rates are affected byI) Concentration gradient II) Temperature III) Pressure IV) Size of the substances
I, II only
I, II, III and IV
II, III, IV only
All except III
The diffusion of water across a selectively permeable membrane is called:
Active transport
Facilitated diffusion
Osmosis
Plasmolysis
Read carefully the following statements and choose the right answer from the options given below
I.    Diffusion is a slow process and it do not depends upon the living system
II.    Usually process of diffusion does not need energy
III.    Diffusion can occur from one part of a cell to another part of the same cell or from one cell to another and from one tissue to another tissue
IV.    Diffusion is a rapid process over short distance, but extremely slow over long distances
I and III
I and II
III and IV
I, II, III and IV
    Movement of molecules in three forms of matter, from a region higher concentration to a region of lower concentration can be termed as
    Osmosis
Passive transport
Diffusion
Active transport
Movement of molecules takes place along the concentration gradient in
Simple diffusion
Facilitated diffusion
Active transport
Both 1 and 2
    Choose the correct option given below
Diffusion needs ATP
    Diffusion is an active and rapid process
    Diffusion is rapid over short distance but extremely slow over long distance transport
    Diffusion is slow over short distance, but rapid over long distance transport
Diffusion is the net movement of particles from:
A region of lower concentration to a region of higher concentration
A region of higher concentration to a region of lower concentration
A region of equal concentration to another region of equal concentration
Randomly with no specific direction
Diffusion is faster in:
Solids
Liquids
Gases
Both solids and liquids
The diffusion coefficient of a gas is inversely proportional to the square root of its molar mass. If gas A has a molar mass four times that of gas B, under identical conditions, the diffusion rate of gas A will be:
Twice that of gas B
Half that of gas B
Four times that of gas B
One-fourth that of gas B
Read carefully the following statements and choose the right answer from the options given below
I.    Diffusion is a slow process and it do not depends upon the living system
II.    Usually process of diffusion does not need energy
III.    Diffusion can occur from one part of a cell to another part of the same cell or from one cell to another and from one tissue to another tissue
IV.    Diffusion is a rapid process over short distance, but extremely slow over long distances
I and III
I and II
III and IV
I, II, III and IV
