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2020101611262320201016105152diffusion Osmosis Practice Problems 1

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Biology
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Florida Atlantic University
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Biology Assignment
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BIOLOGY ASSIGNMENT
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1. A U-tube is divided into two halves, side A and B, by a membrane which is
permeable to water and salt, but NOT to glucose. Side A is filled with a solution
of 8% salt and 2% glucose, while side B is filled with 2% salt and 8% glucose.
8% salt 2% salt
2% glucose 8% glucose
Side A Side B
a. At the start, which side of the U-tube is hypertonic, and which is hypotonic?
Explain why, based on the definitions of hyper and hypotonic.
Since the membrane is not permeable to glucose, in relation to the Salt
concentration, Side A is hypertonic, while Side B is hypotonic.
It is because the solution at side A contains a greater concentration of solute,
which is 8% of salt, thus is hypertonic. In comparison, Side B has a lesser
amount of solute, which is 2% of salt, thus containing a low concentration of
solute, therefore is hypotonic to Side A.
b. Which way will water move across the membrane? Explain why.
Water will move from Side A to Side B. Salt can move across the membrane, but
glucose cannot. Therefore, the salt will move from Side A (highly concentrated with salt)
to Side B (lowly concentrated with salt) until it attains equilibrium. After salt achieves

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Biology Assignment Student’s Name Course Institutional Affiliation Instructor’s Name Date BIOLOGY ASSIGNMENT Answers 1. A U-tube is divided into two halves, side A and B, by a membrane which is permeable to water and salt, but NOT to glucose. Side A is filled with a solution of 8% salt and 2% glucose, while side B is filled with 2% salt and 8% glucose. 8% salt 2% salt 2% glucose 8% glucose Side A Side B a. At the start, which side of the U-tube is hypertonic, and which is hypotonic? Explain why, based on the definitions of hyper and hypotonic. Since the membrane is not permeable to glucose, in relation to the Salt concentration, Side A is hypertonic, while Side B is hypotonic. It is because the solution at side A contains a greater concentration of solute, which is 8% of salt, thus is hypertonic. In comparison, Side B has a lesser amount of solute, which is 2% of salt, thus containing a low concentration of solute, therefore is hypotonic to Side A. b. Which way will water move across the membrane? Explain why. Water will move from Side A to Side B. Salt can move across the membrane, but glucose cannot. Therefore, the salt will move from Side A (highly concentrated with salt) to Side B (lowly concentrated with salt) until it attains equilibrium. After salt achieves equilibrium, Side B will be more concentrated because it will have 8% of glucose while Side A will have only 2% of glucose. Therefore, water will move from the side with a low concentration of solute ...
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