This website uses cookies to ensure you have the best experience. Learn more

An Investigation Of The Glucose Concentration Of The Cell Sap In Potato Cells

4213 words - 17 pages

An investigation of the glucose concentration of the cell sap in potato cells

In this experiment I intend to investigate the effects of osmosis on
potato cells. Specifically, I intend to use my knowledge of osmosis to
investigate the glucose concentration of the cell sap in potato cells.

Osmosis is a method by which water levels on either side of a semi
permeable membrane may balance themselves. It occurs between regions
of high water concentration and low water concentration. As it is a
special method of diffusion exclusive to water, it also allows dilute
and concentrated solutions to balance their strengths. It does this by
preventing large non-water particles from passing through the
semi-permeable membrane due to their size, in order that the water
levels on either side may equate, regardless of the solution's other
contents.

Osmosis is passive, that is to say it does not require energy in order
to be performed. This is because it occurs solely between regions of
high and low water concentration.

The direction and speed of osmosis depends on the two solutions'
osmotic potential. This is the measure of the pressure by which the
water molecules of a solution diffuse across a semi-permeable
membrane. A solution's potential is defined by its concentration. The
more soluble a solution has in it, the lower its water concentration
and the lower its osmotic potential. In the example below sugar
molecules represent the soluble.

Cell sap is contained in the vacuole of a cell and is a part glucose,
part water solution. The membrane of the cell acts as a semi-permeable
membrane across which osmosis occurs (see below). In the case of
osmosis into and out of the vacuole, it occurs across two membranes -
the plasmalemma and the tonoplast. When osmosis occurs, water may
enter or leave the vacuole according to the concentration of the
substances inside and outside the potato cell. In the example below we
see what would happen if a plant cell were surrounded by pure water.
As pure water has the highest water concentration possible, osmosis
will invariably occur into the cell vacuole, which by definition
contains a solution lower water concentration.

The plant cell will take in as much water as is needed to make
the water levels on either side of the membrane equal. As the glucose
molecules cannot pass out of the cell to equate the water levels, the
volume of cell sap within the cell and the weight of the cell itself
will going to increase. Consequently, it is vital that the cell is
able to accommodate some expansion. This is made possible by the
support lent to it by the slightly elastic cellulose cell wall. It
will support a turgid cell enough to prevent it from bursting (see
left). It is turgid cells such as this that provide a plant with its
support.

Animal cells on the other hand, do not have supporting cell walls,
just cell membranes. As plants are always surrounded by water, it is
vital for them to have cell walls, but animal cells, surrounded by...

Find Another Essay On An investigation of the glucose concentration of the cell sap in potato cells

Investigation into osmosis in potato cells

2140 words - 9 pages TaskFor my coursework task I am going to investigate osmosis. I have chosen to investigate how the concentration of glucose molecules affects osmosis in potato cells. Details of the equipment and method I will use are below.Equipment·Cork borer·White tile·Potatoes·Straight edge·Scalpel·Paper towels·5 specimen bottles·Distilled water (0% glucose)·5% glucose solution·10% glucose

The Effect of Glucose Concentration on Anaerobic Respiration in Yeast

859 words - 3 pages The Effect of Glucose Concentration on Anaerobic Respiration in YeastIntroduction:Yeast, also known as a saccharomyces cerevisiae, is single celled eukaryotic cells that are in the kingdom fungi and are unicellular organisms which normally reproduce asexually by budding at a very high rate. Scientists quite often decide to work with yeast because of its features fast growing rate and the fact that yeast's DNA can be easily manipulated. Some

Investigate the Water Potential of Potato Cells

3564 words - 14 pages Investigate the Water Potential of Potato Cells Introduction In my investigation, I hope to determine the water potential of potato cells. The plant material I will use in my investigation will be potato chips, which I will cut myself prior to the investigation. I hope to find the concentration of a solution where the chip stays the same mass and length, which will tell me that the water potential inside the cells is the same as the

Investigate the Effect of Varying Solution Concentration on Osmosis in a Potato Chip

4330 words - 17 pages by osmosis, making the cell swell in size. The cell is now known as turgid. If a potato cell was placed in the same circumstances the cells would increase in length, volume and mass because of the osmotic effects. If the same potato cells were placed in a solution with a low water concentration, then the effects would be the opposite - water would move out of the cell into the area of lower concentration, the water. Thus, the potato chip will

Investigating the Effects of Sucrose Concentration on Osmosis in Potato Tissue

2405 words - 10 pages will decrease in volume/length and mass. I predict that the greater the concentration of water in the external solution the greater the amount of water that enters the cell by osmosis. The smaller the concentration of water in the external solution, the greater the amount of water that leaves the cell. However there will be a point where the concentrations of water inside and outside the potato cells are equal (isotonic

Determining the Influence of pH on the Activity of Catalase Enzyme in Potato Tuber Cells

2302 words - 9 pages INTRODUCTIONEnzymes are vitally important for every living organism, because without them the reactions within the cells would occur to slow to sustain life. However there are many factors which affect the rate of enzymes reactions. One of them is pH, which influence on the enzyme activity will be the subject of this investigation. Catalase of potato tuber cells will be the enzyme used in the experiment.RESEARCH QUESTIONWhat is the influence of

Electrochemistry of Voltammetric Biosensors used for the Measurement of Blood Glucose Concentration

1875 words - 8 pages level of glucose in a particular sample. Reaction 1: Glucose + Glucose Oxidase-FAD → Gluconolactone + Glucose Oxidase-FADH2 Reaction 2: Glucose Oxidase-FADH2 + O2 → Glucose Oxidase-FAD + H2O2 Reaction 3: H2O2 → 2H+ + O2 + 2e- The glucose-1-dehydrogenase (GDH) assay extracts electrons from glucose by employing an oxidizing cofactor such as pyrroloquinoline quinine (PQQ) or nicotinamide-adenine dinucleotide (NAD). The oxidation of glucose

The effect of osmosis in potato cells with different concentrations of sucrose solution

2249 words - 9 pages hypothesis that: If the concentration of a solution into which a cylinder of potato is placed is greater than a certain level the cylinder will contract, and if the concentration is less than that level it will expand. The cell membrane in cells is partially permeable and the vacuole contains a sugar/salt solution. So when a cell is placed in distilled water (high water concentration) water will move across the partially permeable membrane

Marble chip investigation - rates of reaction, studying the effects of change in concentration of the acid

1745 words - 7 pages concentration of the acid. This will include weighing the marble chips every time and trying to use lumps of roughly the same size to keep the surface area fairly constant as a change in surface area will affect the rate of reaction. I will try and avoid a change in temperature and I will use the same equipment throughout the tests. Each concentration will be repeated at least once to improve accuracy as an average can be taken.ResearchThe rate of

"Experiment to investigate the effect of osmosis in potatoes" A GCSE experiment looking at the effects of the concentration of sucrose solution on osmosis in potato tubers

2796 words - 11 pages of osmosis and with a good understanding of molarity I should be able to determine the solute concentration of the vacuoles in potato tuber cells. As it would be impossible to measure with any degree of accuracy the expansion or contraction of cells on an individual basis I have decided to look at gain or loss of water in terms of increase or decrease in mass. Mass, I feel, will be a more accurate way of recording the change of the potatoes as

Regulation of Blood Glucose in the Human Body

853 words - 3 pages regulate the concentration of the blood glucose concentration are insulin and glucagon. In figure 1, it shows how the insulin and glucagon are able to regulate the blood glucose levels. Insulin decreases the blood glucose concentration while glucagon increases it; therefore they are known as the antagonistic hormones as they are opposites. If the blood glucose concentration is above 70-110mg/100mL, the beta cells with the pancreas begin to release

Similar Essays

Investigating The Concentration Of Glucose Inside Cell Sap In Potatoes Through Osmosis

1813 words - 7 pages mean that they were not the same shape.I could, of course, extend this investigation, and perhaps do an experiment to test, taking a plant from fresh water, and a plant from salt water,I could, of course, extend this investigation, perhaps repeating the same experiment but next time using a plant from a fresh water source, and a plant from a salt water source.. And see if the concentration of glucose inside the cell sap differs in anyway. I think

The Concentration Of Sugar In The Cell Sap Of A Potato Cell's Vacuole

1898 words - 8 pages The Concentration of Sugar in the Cell Sap of a Potato Cell's Vacuole Plan In this experiment I am intending to investigate the concentration of sugar in the cell sap of a potato-cell's vacuole. I will discover this using my knowledge of the biological process of Osmosis. Osmosis is the movement of solvent (usually water) through a semi

Finding The Concentration Of A Potato Cell

3783 words - 15 pages to use to find the concentration of solute in the potato. I can use this because cells become turgid if water flows into them or flaccid if water flows out of them, and so I can measure the change in their mass as the water moves though the cell's partially permeable membrane. This is because of the stretchable cell wall on the plant cell. I can find the solute concentration of the potato when the two sides (potato and sucrose solution) are

An Investiagtion To Establish The Isotonic Point Of Potato Cell Sap

1090 words - 4 pages I have been asked to investigate the effects of osmosis on potato cell sap. I will test potato cylinders in different strengths of sucrose solution and record any results in a table. I will then analyse my findings and work out the isotonic point of the potato cell sap.PredictionI have looked at my scientific knowledge from the background theory I carried out and I will base my prediction upon this information. In this experiment, I expect the