Facilitated Diffusion

Q. Porins are the proteins that form huge pores in the membranes

1. True

2. False

Q.

What is the difference between active transport and facilitated diffusion?

Q.

What is the difference between a carrier protein and channel protein?

Q.

Rate of diffusion across the cell membrane depends on which of the following factors?

1. Size of the substances

2. Solubility in lipids

3. Concentration gradient

4. Living system

Q. What is the difference between absorption and adsorption ?

Q.

Give one example of antiport.

Q.

How many types of aquaporins are recorded?

1. 5 types

2. 8 types

3. 4 types

4. 12 types

Q.

Hydrophilic molecules cannot diffuse across the plasma membrane.

1. True

2. False

Q.

What characteristic is shared by simple diffusion and facilitated diffusion?

1. Both require cellular energy for the transport of substances.

2. Both involve the movement of water across a semipermeable membrane.

3. Both require a special carrier molecule to move substances across the membrane.

4. Both involve the movement of a substance from regions of a higher concentration to lower concentration without cellular energy

Q.

Match the following:

Column - I Column - II

A. Aquaporins 1. Transport two molecules in opposite direction

B. Uniporters 2. Use energy to carry substances

C. Symporters 3. Water channels

D. Antiporters 4. Transport two molecules in the same direction

E. Pumps 5. Transport one molecule

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

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

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

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

Q. Which of the following criteria does not pertain to facilitated diffusion?

1. High selectivity
2. Transport saturation
3. uphill transport
4. Requirement of special membrane proteins

Q.

How will you demonstrate the process of plasmolysis in Rhoeo leaf ?

Q. A dialysis machine contains long tubes coiled in a tank containing dialysing solution:​ ​

(i) Of what substance are the tubes made?​ ​ ​

Q.

What are the different types of diffusion ?

Q. What is the meaning of quasi-fluid nature of lipid in cell membrane??

Q.

What characterstic is shared by simple diffusion and facilitated diffusion?

1. Both require a special carrier molecule to move substances across the membrane.

2. Both involve the movement of a substance from regions of a higher concentration to lower concentration without cellular energy.

3. Both require cellular energy for the transport of substances.

4. Both involve the movement of water across a semipremeable membrane.

Q. Which of the following criteria does not pertain to facilitated transport?

1. High selectivity
2. Transport saturation
3. Requirement of special membrane proteins
4. Uphill transport

Q.

How many types of aquaporins are recorded?

1. 12 types

2. 8 types

3. 5 types

4. 4 types

Q. State the function of the following:
Active transport:

[1 Mark]

1. Helps in the transportation of water through the vacuole of root cells
2. Helps in guttation through leaves of certain plants
3. Helps in imbibition
4. Helps in the transportation of minerals through the vacuoles in root cells

Q. in what way is active transport opposite to diffusion?