Diffusion

Q.

What are the factors affecting the rate of diffusion?

Q. The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

1. 1 molecule of 6-C compound
2. 1 molecule of 4-C compound and 1 molecule of 2-C compound
3. 2 molecules of 3-C compound
4. 1 molecule of 3-C compound

Q.

How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?

Q.

What are porins? What role do they play in diffusion?

Q. In which of the following cases can transport saturation be seen?

1. Simple diffusion
2. Facilitated diffusion
3. Both b and c
4. Active transport

Q.

What is diffusion and on what factors rate of diffusion depends?

Q.

Movement of molecules from their higher concentration to their lower concentration.

1. diffusion

2. osmosis

3. active transport

4. transpiration

Q.

What are the 2 types of passive transport?

Q. Diffusion is insufficient to meet .......... requirement of multicellular organisms like humans.

1. Oxygen
2. Carbon dioxide
3. Nitrogen
4. Water

Q. Which of the following molecules can pass through the membrane freely?

1. Sucrose
2. Ammonia
3. Water
4. Glycerol

Q.

When preserved in a strong salt solution, a raw mangos size decreases significantly. Which of the ensuing procedures best explains this?

1. Diffusion

2. Osmosis

3. Reverse Osmosis

4. Dialysis

Q.

Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with the protein.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches the saturation point when all the active proteins are used.

1. I, II, III, IV and V

2. I, II and III

3. V, IV and I

4. I, II, III and V.

Q. The rate of diffusion is affected by

1. temperature and pressure
2. gradient concentration
3. permeability of membranes separating
4. All the above

Q.

Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by ________.

1. osmosis

2. diffusion

3. active transport

4. filtration

Q.

Which factor does not affect the rate of diffusion?

Q.

What is required for diffusion to occur?

Q.

Compared to $O_2$, diffusion rate of $C{O}_2$ through the diffusion membrane per unit difference in partial pressure is much higher. Explain.

Q.

Differentiate between

Imbibition and diffusion

Q.

Does simple diffusion require ATP energy?

Q.

How does the rate of diffusion vary with the solubility in lipids?

Q.

What are the factors affecting the rate of diffusion?

Q.

Ion carriers are located in which part of the cell???

Q.

Explain the effect of heat on the rate of diffusion.

Q. Simple diffusion does not require

1. proteins
2. both b and c
3. concentration gradient
4. ATP

Q. Choose the correct option with respect to the process of diffusion.

1. Occurs until equilibrium is achieved
2. A method by which gaseous transport occurs in plants
3. All of the above
4. Diffusing particles exert diffusion pressure

Q.

Movement of molecules from their lower concentration to their higher concentration is called

1. Diffusion

2. Osmosis

3. Active transport

4. Transpiration

Q. Choose the correct statement

1. The rate of diffusion increases with increasing size of molecules
2. Substances that have hydrophilic moiety can easily pass through the plasma membrane
3. The transport of substances with the help of membrane proteins always require ATP
4. Diffusion is an example of downhill transport

Q.

Question 33

Structure and function are correlatable in living organisms. Can you justify this by taking plasma membrane as an example?

Q.

____________ is the movement of molecules from a region of higher concentration to a region of lower concentration.

Q. Which of the following boundaries do the molecules have to cross during short distance transport?

1. Cell wall
2. Cell membrane
3. Plasma membrane
4. All of the above.