Means of Transport

Q. Which among the following statements are incorrect?
I. Transport proteins are needed by both facilitated diffusion and active transport.
II. Porins are carrier proteins
III. The carrier proteins needed by facilitated and active transport are specific.
IV. There is no need for energy to pump molecules against a concentration gradient in active transport.
V. Transport rate reaches saturation point when all the transport proteins are used or engaged.

1. IV and V
2. I, II and III
3. II and IV
4. I, III and V

Q.

What is an example of active transport in the human body?

Q. Uphill transport involves movement of molecules

1. against concentration gradient
2. along concentration gradient
3. without the help of transport proteins
4. without expenditure of energy

Q. The movement of mineral ions into plant root cells as a result of diffusion is called

1. osmosis
2. active absorption
3. passive absorption
4. endocytosis

Q. Porins are

1. carbohydrates
2. none of these
3. proteins
4. lipids

Q. Membrane proteins are responsible for

1. active transport
2. all of these
3. passive transport
4. transport of water

Q. Given below is a comparison of the characteristic features of facilitated and active transport mechanisms. Which of the following is wrong?

1. Requires special membrane proteins
   Facilitated transport -No
   Active transport - Yes
2. Highly selective
   Facilitated transport - No
   Active transport - Yes
   
3. Uphill transport
   Facilitated transport - No
   Active transport - Yes
   
   
4. Requires ATP
   Facilitated transport - No
   Active transport - Yes

Q.

Are passive transport and facilitated diffusion the same thing?

Q.

Does active transport require special membrane proteins?

Q.

What are the types of transport processes?

Q.

What affects the permiability of a cell membrane?

Q. Which of the following is permeable to all substances?

1. Cell wall
2. Cell membrane
3. Plasma membrane
4. None of these

Q. Water in adjacent xylem moves into the phloem by the process of

1. Osmosis
2. Facilitated diffusion
3. Active transport
4. Simple diffusion

Q. Respiratory membrane is

1. Permeable
2. Non permeable
3. Semipermeable
4. Can be of any type

Q. Read the following statements carefully and state the number of correct statements.
I. Cells have about 70-90% water
II. Animal cells have higher water content as compared to plant cells
III. 10% of the water absorbed is used for photosynthesis
IV. Cell membrane is permeable to water
V. Bound water molecules move about as freely as free water molecules

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

Q. Uphill transport involves movement of molecules

1. along concentration gradient
2. against concentration gradient
3. without the help of transport proteins
4. without expenditure of energy

Q. When a molecule moves across a membrane independent of other molecules, the process is called (i) Uniport (ii) Symport (iii) Antiport?

1. i and ii
2. i and iii
3. i
4. ii and iii
5. iii

Q. Which among the following statements are incorrect?
I. Transport proteins are needed by both facilitated diffusion and active transport.
II. Porins are carrier proteins
III. The carrier proteins needed by facilitated and active transport are specific.
IV. There is no need for energy to pump molecules against a concentration gradient in active transport.
V. Transport rate reaches saturation point when all the transport proteins are used or engaged.

1. IV and V
2. I, II and III
3. II and IV
4. I, III and V

Q.

The movement of a substance across the membrane independent of another substance is called

1. Uniport

2. Symport

3. Cotransport

4. Antiport

Q. The image shown below is the movement of molecule A across the plasma membrane by facilitated diffusion. The type of facilitated diffusion shown in the image is

1. uniport
2. symport
3. antiport
4. simple diffusion

Q. Which among the following is a mode of short distance transport?

1. Translocation supplemented by active transport
2. Cytoplasmic streaming supplemented by active transport
3. Translocation supplemented by passive transport
4. Translocation by itself

Q. In which type of passive transport simple diffusion or facilitated diffusion. A carrier protein is required for transport across the membrane.

Q. Which of the following is permeable to all substances?

1. Cell wall
2. Cell membrane
3. Plasma membrane
4. None of these

Q. Assertion :In symport method, both molecules cross the membrane in the same direction at the same time. Reason: In antiport method, both molecules move in opposite direction.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Where are porins present?

Q. In soil, water available for plants is

1. Hygroscopic water
2. Capillary water
3. Gravitational water
4. Chemically bound water

Q.

Define the - Active transport .

Q. Match the type of transport with the direction at which it facilitates the movement of two solute molecules.

1. Same direction
2. Opposite direction
3. Independent movement

Q. According to an accepted model of plasma membrane, transport during 'symport' or 'co-transport' of sugar or amino acids through cell membrane is when

1. Na${}^{+}$ ions move in both directions irrespective of concentration gradient.
2. Na${}^{+}$ ions moves in the direction of its concentration gradient.
3. Na${}^{+}$ ions moves against the direction of its concentration gradients.
4. No movement of Na${}^{+}$ ions is involved.

Q. In passive transport, carrier protein is required to facilitate transport of

1. Neutral solutes
2. Non polar molecules
3. Hydrophobic molecules
4. Polar molecules