Active Transport

Q. Which among the following are reabsorbed actively?
Glucose, amino acids, water, nitrogenous waste, $N{a}^{+}$

1. Glucose and amino acids
2. Nitrogenous wastes only
3. Glucose, amino acids, $N{a}^{+}$
4. Water, glucose, amino acids, Na+

Q. Glucose is reabsorbed from glomerular filtrate through

1. passive transport
2. diffusion
3. osmosis
4. active transport

Q. Active transport of the plasma membrane involves the movement of molecules

1. along the concentration gradient
2. against the concentration gradient
3. both along and against the concentration gradient
4. neither along nor against the concentration gradient

Q.

Describe the role played by protein pumps during active transport in plants.

Q. Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?

Q.

We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc. What mechanisms are involved in the absorption of digested food and water?

Q.

What are channel proteins?

Q. The sodium- potassium requires energy to move sodium and potassium ions across the cell membrane. Which of these describes the process used by the sodium-potassium pump?

1. Active transport
2. Photosynthesis
3. Diffusion
4. Osmosis

Q.

What are protein pumps used for?

Q. The assimilation of fats includes
(1) micelle formation
(2) secretion of chylomicrons
(3) emulsification of fat
(4) absorption of fat by enterocytes
Which sequence best describes the correct temporal order of these events?

1. 3, 1, 4, 2
2. 3, 4, 1, 2
3. 3, 1, 2, 4
4. 3, 2, 4, 1

Q. Read the statements given below carefully and determine their validity by choosing the correct option.
I. Carrier proteins are used in active transport.
II. These carrier proteins use ATP to transport molecules along the concentration gradient of cell membrane.

1. Both I and II are correct and II is the correct explanation of I.
2. Both I and II are correct, but II is not the correct explanation of I.
3. I is correct but II is wrong.
4. Both I and II are wrong.

Q. Active transport is characterized by

1. the requirement of special proteins
2. the expenditure of ATP
3. being highly selective of the molecules transported
4. all of the above

Q.

Are mineral ions absorbed by active transport?

Q.

The crescograph was invented by

1. Bose

2. Pfeffer

3. Ganong

4. Dixon

Q.

How nutrients are absorbed by plants?

Q. Molecules which are transported across the membrane against their concentration gradient, i.e. from the lower to higher concentration. Such a transport is called

1. Active transport, e.g., diffusion
2. Passive transport, e.g., diffusion
3. Osmosis, a type of simple diffusion
4. Active transport, e.g., $N{a}^{+}/K^{+}$ pump

Q.

How is ATP used in active transport?

Q. Electroporation is

1. making transient pores in cell membranes to introduce gene constructs
2. purification of saline water with the help of membrane system
3. opening of stomata by artificial light during night
4. fast passage of nutrients through phloem sieve pores by electric stimulation

Q.

Does protein pump require energy?

Q.

Carrier ions like Na⁺ facilitate the absorption of substances like?

1. Fructose and some amino acids

2. Glucose and fatty acids

3. Fatty acids and glycerol

4. Amino acids and glucose

Q. A type of transport requires special proteins, it is highly selective, it is an uphill transport and requires ATP energy. This transport mechanism is

1. simple diffusion
2. facilitated transport
3. active transport
4. osmosis

Q. Select the correct option that represents the enzyme composition of succus entericus.

1. Pepsin, amylase, rennin, lipase
2. Enterocrinin, carboxypeptidase, trypsin, elastase
3. Enterokinase, nucleosidase, dipeptidase, lipase
4. Renin, pepsinogen, trypsinogen, lipase

Q. The movement of ions against the concentration gradient will be:

1. Active transport
2. Osmosis
3. Diffusion
4. All of these

Q. Which among the following are reabsorbed actively?
Glucose, amino acids, water, nitrogenous waste, $N{a}^{+}$

1. Glucose and amino acids
2. Nitrogenous wastes only
3. Glucose, amino acids, $N{a}^{+}$
4. Water, glucose, amino acids, Na+

Q. Assertion: $ATP$ase enzyme has two parts; one called the $F_1$ is embedded in the membrane of thylakoid and forms a transmembrane channel that carries out facilitated diffusion of proton across the membrane.

Reason: The other portion is called $F_0$ and protrudes on the thylakoid membrane on the side that faces stroma.

1. If both assertion and reason are false.
2. If assertion is true but the reason is false.
3. If both assertion and reason are true but the reason is not the correct explanation of the assertion.
4. If both assertion and reason are true and the reason is the correct explanation of the assertion.

Q. Transpiration facilitates

1. absorption of water by roots
2. excretion of minerals
3. electrolyte balance
4. opening of stomata

Q.

Fats are compounds of _______ and _________.

Q. Protein pumps help in

1. simple diffusion
2. active transport
3. facilitated diffusion
4. imbibition

Q. The movement of ions against the concentration gradient will be:

1. Active transport
2. Osmosis
3. Diffusion
4. All of these

Q.

The dissolved substances such as food (glucose) and oxygen can enter into the cell whereas waste products such as carbon dioxide can go out from the cells through the pores of the ___.