Passive Transport

Q.

What are examples of secondary active transport?

Q. The common feature shared both by simple diffusion and facilitated diffusion is

1. both require energy for the transport of substances.
2. both involve the movement of substances from regions of lower concentration to higher concentration without expenditure of energy.
3. both require a special carrier molecule to move substances across the membrane.
4. both involve the movement of substances from regions of higher concentration to lower concentration without expenditure of energy.

Q. Consider the following statements with reference to facilitated diffusion:
(a) Requires ATP energy
(b) Transport saturates
(c) Highly selective
(d) Requires special membrane protein
(e) Uphill transport
Out of the above statements:

1. a, b and c are relevant but d and e are irrelevant
2. b, c and e are relevant but a and d are irrelevant
3. c, d and e are relevant but a and b are irrelevant
4. b, c and d are relevant but a and e are irrelevant

Q. Which one of the following substances can be reabsorbed from the nephron passively?

1. Sodium ions
2. Amino acids
3. Nitrogenous wastes
4. All of the above

Q. When a fresh water protozoan possessing a contractile vacuole is placed in a glass containing marine water, the vacuole will:

1. Disappear
2. Increase in size
3. Decrease in size
4. Increase in number

Q. Which one of the following substances can be reabsorbed from the nephron passively?

1. Sodium ions
2. Amino acids
3. Nitrogenous wastes
4. All of the above

Q. The transport of molecules across the cell membrane without the expenditure of energy is an example of

1. active transport
2. absorption
3. passive transport
4. secretion