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How is diffusion different from osmosis?

a. osmosis is the reverse of diffusion
b. osmosis is the diffusion of water across a semi-permeable membrane, diffusion is not limited to water
c. osmosis only works in living organisms, diffusion applies to both living and non-living systems
d. osmosis only refers to the movement within living cells

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Nelly Stracke
Nelly StrackeLv2
28 Sep 2019
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Related questions

A hypertonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

A hypertonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

A hypotonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

The salt and water solution in the potato is a hypotonic solution

Osmosis is the movement of large molecules across a membrane which require embedded proteins

The plain water in this experiment is the solvent and the salt is the solute.

Passive transport requires no energy and the molecules move with the concentration gradient or from high concentration to low concentration

Active transport required no energy and the molecules move with the concentration gradient or from high concentration to low concentration.

The water on the inside of the potato with the salt molecules is an isotonic solution the same as the solution on the outside of the potato.

Water will not move by simple diffusion (osmosis) into or out of cells it requires energy or protein transporters

The solution of salt water in the potato has a lower concentration of water molecules so the water on the outside should move into the cells

1. In lecture, we described a simple osmotic pressure gradient when discussing osmosis. For question #1, describe the simple osmotic pressure gradient, in terms of osmotic pressure, that exists across the red blood cell plasma membrane when red blood cells are suspended in a severely hypotonic solution, such as a 0.2% NaCl solution. Use scientific terminology.

2. We mentioned in class that biological systems are always in a state of osmotic equilibrium due to a combination of solute diffusion in some cases and osmosis in others. In this experiment, when you add the red blood cells to a severely hypotonic solution, what substances are moving across the red blood cell plasma membrane to achieve osmotic equilibrium, Na+ and Cl- or water? Explain why based on your understanding of the permeability characteristics of biological membrane. Always use scientific language.

CAN QUESTIONS 1 AND 2 BE ANSWERED DIRECTLY AND ADEQUATLEY PLEASE.

HERE IS AN INTRO TO THE LAB EXPERIMENT

Intro:

We have known for a very long time that the mammalian red blood cell plasma membrane is very permeable to water. Even the introductory biology student understands that if you put mammalian red blood cells in water, they will rapidly swell and break open (hemolyze) due to the rapid osmosis of water into the cell. The experimental question we are asking in today's lab experiment is "Is the high water permability of mammalian red blood cell plasma membrane due solely to the lipid bilayer, or are there water channels present in the membrane?"

Experimental Design:

It has been shown by several investigators that water movement through water channels can be blocked by the known K+ channel blocker, tetraethylammonium chloride (TEAC). Brooks, Regan and Yool (2000) showed that TEAC reduces the water permeability of human water channels expressed in the plasma membranes of frog ocytes. After preincubation of the oocytes for 15 min with 100 microM TEAC, the water permeability of frog oocyte plasma membrane containing human water channels was reduced 20 to 40%. The investigators concluded that treatment of cells with TEAC can be useful in determining the presence of aquaporins in membranes.The specific objective of today's experiment is to uncover the presence of water channels in mammalian red blood cell plasma membrane by determining the effect of tetraethylammonium chloride on the water permeability of mammalian RBC plasma membrane.

1. Which of the following best describes a condition where a membrane separates two solutions that are NOT in equilibrium?

A a rainbow
B equilibrium
C a homogeneous solution
D neighboring solutions that have unequal concentrations of molecules

2. In this lab, we will use dialysis tubing to....

A simulate biological membranes
B separate blood from urine
C turn starch blue
D turn starch brown

3. Biological membranes have different types of pores and channels, and different permeability to small molecules depending on size and charge. In this lab, you can assume that the dialysis tubing we are using are permeable to....

A starch
B water and potassium iodide
C complex sugars
D small animals

4. Kinetic energy is a property of the atom, and also of more complex structures such as molecules. You can actually see kinetic energy of non-living things in action under the microscope. When we visualize this, we call what we see...

A diffusion
B Brownian motion
C osmosis
D all of the above

5. One word to describe the effect of water diffusion across a membrane, which alters the water pressure on one side of the membrane with respect to the other is....

A osmosis
B lysis
C aquaporin
D equilibrium

6. Suppose that you place a red blood cell in a hypertonic solution containing penetrating molecules. In this environment, you would expect the cell to eventually

A swell and burst
B shrink
C remain the same in size
D photosynthesize

7. For the "egg lab", what is the main objective?

A to determine which egg has more mass
B to determine which egg is hypertonic to the other
C to determine which solution the egg is placed in is hyper- or hypo-tonic solution
D to determine which egg is isotonic with the egg

8. The main difference between a 'prediction' and a 'hypothesis', is that predictions....

A are framed as an "if...then...because" statement
B are framed as a general statement
C are framed as an "always....true" statement
D are framed as an "correct....incorrect" statement

9. Read each of the following procedural steps for plasmolyzing Elodea sprig and then select the correct order below.

Locate a region of healthy cells and sketch a few adjacent cells

Sketch the plasmolyzed cell

While touching one corner of the coverslip with a piece of Kimwipe to draw off the
water, add a drop of concentrated salt solution to the opposite corner

Obtain a leaf from an Elodea or Water sprite plant

A 4, 2, 3, 1
B 3, 1, 4, 2
C 2, 3, 1, 4
D 4, 1, 3, 2

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