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Earn 100

What is Facilitated Diffusion? Explain.

Important Questions on Cell Membranes and Transport

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The water potential ψp of pure water at standard temperature and atmospheric pressure is:
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The containers X and Y have 1 litre of pure water and 1 litre of 0.1 M sugar solution, respectively. Which one of the following statements would be correct regarding their water potential Ψ and osmotic potential Ψs?

*Note: There were errors in original KVPY papers, and thus the options are modified here.

HARD
Which of the following elements is responsible for maintaining turgor in cells?
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In simple organisms, exchange of gases and excretion occurs through –
MEDIUM

Assertion (A): The flow of solvent molecules from a pure solvent to the solution through semipermeable membrane is osmosis.

Reason (R): Pure solvent molecules flow out of the solution through semipermeable membrane if a pressure larger than the osmotic pressure is applied to the solution side.

The correct answer is:

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Which of the following physico-chemical techniques is commonly used to desalinate brackish water?
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The movement of molecules during diffusion can be described through all of the following except - 
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The plasma membrane (pm) forms the boundary of lung cells. Which of the following statements is true for the pm?
A. Plasma membrane is a semipermeable membrane
B. Water moves across the pm by osmosis.
C. O2 and CO2 can cross the pm by diffusion.
D. Na+ and K+ ions can pass the pm by diffusion.
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Give reasons why a perfume sprayed in a corner of a room can be smelled in other parts of the room?
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In ____ permease assists a molecule to diffuse through the membrane that it cannot penetrate alone.
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Assume that an actively respiring cell has 3x number of K+ in its cytoplasm and 2x number of K+ entered into the cell. What is the process by which K+ transport has taken place?
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Movement of a substance from the area of low concentration to an area of high concentration is called diffusion.