Osmosis: Osmosis and Sucrose Solution Essay

Submitted By sandygupta30
Words: 1253
Pages: 6
Open Document
Introduction All animals and plants are composed of cells and cell products. There is no life without cells. The idea that the cell represents the basic structural and functional unit of life is an important unifying concept of biology.
The incredibly thin, yet sturdy, plasma membrane that encloses every cell is vitally important in maintaining cellular integrity. It is a permeability barrier that separates the interior from the external environment of the cell, regulates the vital flow of molecular traffic into and out of the cell, and provides many of the unique functional properties of specialized cells. Membranes inside the cell surround a variety of organelles. A plasma membrane acts as a selective gatekeeper for the entrance and exit of the many substances involved in cell metabolism. Because conditions outside the cell are different from and more variable than conditions within the cell, it is necessary that the passage of substances across the membrane be rigorously controlled. Intracellular organelles are also constrained by a membrane which separates them from the cytoplasm of the cell. The main constituents of the plasma membrane are phospholipids, proteins and carbohydrates. The phospholipids are regularly organized in the membrane according to their polarity: two layers of phospholipids form the lipid bilayer with the polar part of the phospholipids pointing to the exterior of the layer and the non-polar phospholipid chains in the interior. Proteins can be found embedded in the lipid bilayer and there are also some carbohydrates bound to proteins and to phospholipids in the outer face of the membrane. Channel proteins provide hydrophilic pathways which regulate the movement of water molecules and small ions in and out of the cell.
Diffusion: The spontaneous movement of molecules or particles in solution along a concentration gradient (i.e. from areas of high concentration to a low concentration) until there is an equilibrium.
Osmosis: The diffusion of water molecules through a selectively permeable membrane from a region of low solute concentration to a region of high solute concentration.

Objective

• Demonstrate diffusion across a semi-permeable membrane

•Measure the effects of various concentrations of solute in the process of osmosis
• Examine the effects of osmosis on non-living model using dialysis tubing.
Method: Refer to for full details to USQ, Biology 1, Kennedy and Withers practical manual 2013. The dialysis tubing serves as the permeable membrane with which diffusion will occur. Since cells are so small in size, this experiment poses as a model in which diffusion can be witnessed and recorded, to begin the experiment 30cm dialysis tubing was used and tied off at the bottom and filled with a water for control, .5Mand 1M sucrose and salt solution . The bag was filled with one solution at a time and a straw was inserted to record rate of osmosis of each solution inside the dialysis tubing and were then placed in jar filled with water to see if there will be any diffusion across the membrane. Once all the bags were placed in water jar, the height of solution level on straw were recorded every five minutes interval from the initial starting time to calculate the rate of osmosis.

Results:
This experiment was performed to demonstrate the process of osmosis and to show visible as well as quantitative evidence proving that osmosis occurred. The intent of the experiment was to study osmosis. To that effect, the experiment was successful. Osmosis occurred—there was a change in level of solution in straw, which was placed in dialysis tubing filled with different concentration of sucrose and salt solution. This indicates that water diffused across the semi-permeable dialysis tubing.
Hypothesize that the more concentrated sucrose solutions will cause a greater amount of osmosis. From the results taken, the more concentrated solutions of 1M sucrose seemed to draw the water towards it.
Show More

Related Documents: Osmosis: Osmosis and Sucrose Solution Essay

Osmosis Experiment

The process of osmosis is wonderful and intriguing. It is a cellular level process that constantly takes place in the body without even being noticed. This experiment to define how osmosis works in different environments help to understand the process a little easier. In the experiment, its objectives are to define solvent, solute and solution. Define osmosis, isotonic, hypotonic, hypertonic as they relate to relative concentrations of osmotically active substances. Determine the direction and rate…

Words 1115 - Pages 5

Lab Report Osmosis Essay

The effect of osmosis on artificial cells with different concentrations of sucrose Alex McRae Biology 120-902 Grand Valley State University 1 Campus Drive Allendale, MI 49401 mcraeal@mail.gvsu.edu Abstract In this study, we tested the validity of osmosis in artificial animal cells. Osmosis is the diffusion of free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different…

Words 1673 - Pages 7

Osmosis Potato Lab Report Biology 4u Essay

Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis. If there is a solute and a solvent, each containing different concentration levels, then the water would move along its concentration gradient until each side of the membrane are equal. The water moves because the membrane is impermeable to the solute and the solute concentrations may differ on either side of the membrane. Water molecules may move in and out of the cell, but there is no net diffusion…

Words 2115 - Pages 9

Lab Report On Osmosis

Osmosis Lab Mikayla Clarke 10/2/16 Abstract: The purpose for the osmosis lab was to observe osmosis and determine the sucrose molarity of a potato and a carrot. This lab was separated into two different parts. In the first part of the lab, osmosis was observed by placing dialysis bags with various concentrations of sucrose into beakers of water. In the second part of the lab, the molar concentration of a potato and a carrot were determined by placing slices of potatoes and carrots…

Words 1625 - Pages 7

Physio Ex 9.0 Excercise 4 Essay

Lab 1: Diffusion, Osmosis Objective: In this lab we observed osmosis across a semi permeable membrane. Through this experiment, we were able to see the concept of osmosis in action as the water moved from areas of low solute (sucrose) across a membrane areas of higher solute concentration. Another concept we learned in this lab was how tonicity of a solution can affect osmosis into and out of a cell. Materials and Methods: For the first part of this lab, we got a piece of dialysis tubing…

Words 564 - Pages 3

Osmosis: Concentration Gradient Essay

area of high concentration to an area of lower concentration is commonly known as osmosis. Osmosis is one of the processes that allow materials to move either in or out of an organism or within it. In order for osmosis to occur, there needs to be a semi permeable membrane for the water molecules to pass through. Semi permeability refers to the ability of a membrane to partially allow water to pass through it. Osmosis depends on energy generated by differences in concentration of substances on both…

Words 456 - Pages 2

Potato Osmosis Lab Report

Osmosis in Potato inquiry Introduction Cell membranes are permeable to water and all cell membranes are selectively permeable. This means some substances are allowed to enter the interior of the cell and some substances are not allowed to enter the interior of the cell. Osmosis is the movement of water across membranes to balance solute. Osmosis moves water from a hypotonic area to a hypertonic area, also known as diffusion. This process is especially important in a plant cell because it allows…

Words 761 - Pages 4

Diffusion: Osmosis and Sucrose Essay

Diffusion and Osmosis lab Abstract: In this experiment, we learnt about Osmosis and Diffusion through potato slices and dialysis tubes in different concentration of sucrose; (Di water, .2, .4, .6, .8, and 1.0). However, our result was quite off in both of out labs but although our graph and our results were off, it still partially backed up our hypothesis. Introduction: Osmosis is a special kind of diffusion in which water moves through a selectively permeable membrane while…

Words 517 - Pages 3

Essay about Osmosis and Hypertonic Potato Cores

is Biology: Osmosis and Diffusion Lab using Potato Cores Class: 3B Mr. Boyer Name: Simon Han Abstract: In this experiment, we learnt about Osmosis and Diffusion through potato cores in different concentration of sucrose, (water, .2, .4, .6, .8, 1.0). We realized that the…

Words 1583 - Pages 7

Causes And Effect Of Plasmolysis In Osmosis

enters the cell by osmosis will depend on the balance between inside and outside water potentials. If the solutions on each side of the partially permeable membrane are equal, then there will be no movement of across the membrane. This is called equilibrium and the solutions are called isotonic. When lead nitrate is enters a cell it can inhibit the carrier proteins by non-competitive, this can damage the partial permeable cell membrane. If the membrane of a cell is damaged osmosis can't occur which…

Words 341 - Pages 2