Facilitated Diffusion

Q. Identify the incorrect statement related to facilitated diffusion.

1. Substances are transported without the use of ATP.
2. Causes net transport of molecules from low to high concentration
3. Transport rate reaches saturation.
4. Very specific and selective to substances

Q. Select the incorrect statement with respect to facilitated diffusion.

1. Highly selective
2. Uphill transport
3. Requires special membrane proteins
4. Transport saturates

Q. Select the correct statements about facilitated diffusion.

1. There is a specific protein carrier for a specific substance to be transported.
2. The same protein carrier transports all the substance through the membrane.
3. There is no limit to the rate of transport of a substance by facilitated diffusion.
4. The rate of transport is limited by saturation, i.e. when all protein carrier molecules are being used.

Q. Select the correct option for the table given below.
$\begin{array}{ccc}& \text{Facilitated diffusion}& \text{Active transport}\\ \text{Transport saturates}& \text{yes}& \text{(1)}\\ \text{Uphill transport}& \text{(2)}& \text{yes}\end{array}$

1. (1) is yes and (2) is no
2. (1) is no and (2) is yes
3. (1) is yes and (2) is yes
4. (1) is no and (2) is no

Q. Diffusion that occurs through carrier proteins is

1. Simple diffusion
2. Passive diffusion
3. Facilitated diffusion
4. Active diffusion

Q. Select the incorrect statement with respect to facilitated diffusion.

1. Highly selective
2. Uphill transport
3. Requires special membrane proteins
4. Transport saturates

Q.

Transport against the concentration gradient can be done without using energy.

1. True

2. False

Q. Match the following:
$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{A. Aquaporins}& \text{1. Transport two molecules inopposite direction}\\ \text{B. Uniporters}& \text{2. Use energy to carry substances}\\ \text{C. Symporters}& 3.\text{Water channels}\\ \text{D. Antiporters}& \text{4. Transport two molecules in the same direction}\\ \text{E. Pumps}& 5.\text{Transport one molecule}\end{array}$

1. A - 3, B - 5, C - 4, D - 1, E - 2

2. A - 5, B - 4, C - 3, D - 2, E - 1

3. A - 1, B - 2, C- 3, D - 4, E - 5

4. A - 3, B - 5, C - 1, D - 4, E - 2

Q. Select the correct statements about facilitated diffusion.

1. There is a specific protein carrier for a specific substance to be transported.
2. The same protein carrier transports all the substance through the membrane.
3. There is no limit to the rate of transport of a substance by facilitated diffusion.
4. The rate of transport is limited by saturation, i.e. when all protein carrier molecules are being used.