Q. No.In gram negative bacteria the outer membrane:
1. is the major permeability barrier
2. is a thick peptidoglycan layer
3. is more permeable to hydrophilic substances
4. is devoid of lipopolysaccharides
1. is the major permeability barrier
2. is a thick peptidoglycan layer
3. is more permeable to hydrophilic substances
4. is devoid of lipopolysaccharides
Unlike a symporter and an antiporter, a uniporter:
1. is not an integral membrane protein
2. is a cell surface carbohydrate
3. is not a co-transporter
4. cannot be used for active transport
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What differentiates active transport from facilitated diffusion?
I. Uphill transport
II. Requirement of special membrane proteins
III. Selective nature
1. Only I
2. Only I and II
3. Only I and III
4. Only II and III
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Consider the following statements:
| I. | Pure water is usually defined as having a solute potential (Ψπ)of zero. |
| II. | A solution will have a lower and hence more negative water potential than that of pure water. |
| III. | The more solute molecules present, the more negative the solute potential is. |
Correct statements are:
1. I and II
2. I and III
3. II and III
4. I, II and III
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Consider the following statements regarding water potential:
I. Water potential is the potential energy of water relative to pure free water (e.g., deionized water)
in reference conditions.
II. Typically, pure water at standard temperature and pressure (or other suitable reference condition) is defined as having a water potential of 0.
III. The addition of solutes to water increases its potential (makes it more negative), just as the increase in pressure lowers its potential (makes it more positive).
The correct statements are:
| 1. I, II and III | 2. I and II |
| 3. I and III | 4. II and III |
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The pressure that must be applied to a solution to prevent the inward flow of water across a semi permeable membrane is called as:
1. Hydrostatic pressure
2. Water potential
3. Osmotic pressure
4. Osmotic potential
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During Plasmolysis:
1. Water is first lost from the cytoplasm and then from the vacuole
2. Water is first lost from the vacuole and then from the cytoplasm
3. Water is lost only from the cytoplasm and not from the vacuole
4. Water is lost only from the vacuole and not from the cytoplasm
For imbibition to occur, affinity between the adsorbant and the liquid is:
1. not essential
2. not essential since imbitition is also a diffusion
3. not essential if occurring against the concentration gradient
4. a pre-requisite
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Consider the following statements:
I. In diffusion, different substances move independently of one another depending on their individual concentration gradients.
II. Similarly, in bulk transport, different substances move independently of one another depending on their individual concentration gradients.
III. Bulk flow can be achieved either through a positive hydrostatic pressure or through a negative hydrostatic pressure.
Correct statements are:
1. I, II, III
2. I and II
3. I and III
4. II and III
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The movement of water through the root layers is ultimately:
| 1. apoplastic along the walls | 2. active transport by porins |
| 3. symplastic in the endodermis | 4. symplastic in the xylem |
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