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The total sol...

Question

The total solute concentration in a red blood cell is about 2%. Sucrose cannot pass through the cell membrane, but water and urea can. Osmosis would cause such a cell to shrink the most when the cell is immersed in which of the following solutions?

A

A hypertonic sucrose solution

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B

A hypotonic sucrose solution

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C

A hypertonic urea solution

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D

A hypotonic urea solution

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Solution

The correct option is C
A hypertonic urea solution

A hypertonic solution is one where the solute is in higher concentration than the solvent. Osmosis would cause the cell to shrink when the cell is immersed in a hypertonic urea solution.

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Q. Assertion :When a cell is placed in hypertonic solution, it shrinks. Reason: Reverse osmosis is used for desalination of water.

Q.
Read the following passage and answer the following questions.
Dialysis tubing is a semipermeable membrane. It allows small molecules, such as water, to pass through easily, while larger molecules, such as sucrose, are restricted. Movement of molecules across the tubing is due to concentration gradients. In an experiment designed to study osmosis, several pieces of dialysis tubing were filled with sucrose solutions of varying concentration and placed in beakers containing distilled water. The rate and direction of water movement was determined by weighing the bags before and after placing them in the distilled water. The data are recorded below.Table 1

Tube number	Tube contents (beaker contents)	Mass(g) 0 minutes	Mass (g) 15 minutes	Mass (g) 30 minutes	Mass (g) 45 minutes	Mass (g) 60 minutes
1	Distilled water (distilled water)	22.3 g	22.4 g	22.2 g	22.3 g	22.3 g
2	10% sucrose (distilled water)	24.8 g	25.3 g	25.7 g	26.4 g	26.9 g
3	40% sucrose (distilled water)	25.1 g	26.3 g	27.5 g	28.9 g	29.6 g
4	Distilled water (40% sucrose)	22.7 g	21.3 g	20.5 g	19.8 g	18.7 g

Cell membranes are also semipermeable, allowing water but not other substances to cross easily. A red blood cell placed in a 0.9% NaCl solution will neither swell nor shrivel. Based on this knowledge, and the information presented in Table 1, what would happen to a red blood cell placed in a 20% NaCl solution?

Q. The total concentration of dissolved particles inside red blood cells is approximately 0.30 M and the membrane surrounding the cells is semipermeable. What would the osmotic pressure (in atmosphere) inside the cells become if cells were removed from the blood plasma and placed in pure water at 298 K ?

Q. Assertion :Red blood cells burst when placed in water. Reason: Water enters into blood cells due to osmosis.

Q. The concentration of solute is more on the outside of a cell but still it is entering into the cell through the cell membrane. Which of the following is true as per the statement?

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