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GCSE OSMOSIS PRACTICAL COURSEWORK
... you can see in the diagram below which shows a higher water concentration outside the turgid cell, whereas on the plasmolysed cell there is lower water concentration outside. If a lot of the water leaves the cell, the cytoplasm begins ...
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"An investigation into the Respiration of Carbohydrate Substrates by Yeast."
... conditions we carried out a pilot experiment. In this experiment we used a range of temperatures from 10° to 60°C and three different concentrations of carbohydrate 1%, 5% and 10%. The experiment was carried out as a group experiment with ...
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"It makes no sense to believe that Christ is really present in the Eucharist"- Evaluate this statement.
... and only believe what they hear when they see it before their very eyes; therefore not believing in Christ as they have not seen him in the flesh. They may believe that the whole of the Eucharist is just representation ...
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'Factors affecting the rate of respiration in immobilised yeast'.
... be more carbon dioxide to respire. I don't think that the yeast balls' mass or size will differ enough to change the results, as they would only differ in .01 of a gram, which is only a slight difference.
Prediction
I predict ...
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'Some diseases/disorders which affect human beings are associated with altered levels of specific proteins in the body.'
... maintain a constant level of blood glucose, which is approximately '90mg/ml in humans.'[1]
Insulin secretion from beta cells is stimulated in response to high blood glucose concentrations. It acts to lower blood glucose by stimulating uptake of glucose from the ...
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'With reference to their chemical structures and properties, describe why starch, glycogen and cellulose are efficient storage or structural compounds.'
... reaction of condensation. Now being in the form of glucose it can be used in respiration by the plant.
Also due to amylose and amylopectin both being of a compact nature, it being a characteristic of the two, a large amount ...
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A basic understanding of diffusion and osmosis
... the dialysis tube. My null hypothesis was that none of these particles would be able to diffuse through the test tube in beaker.
Materials:
Refer to lab manual (page 53) in Nelson Biology 11.
The following revisions were made.
-We used Fehling's solution instead ...
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A Colorimetric method for the estimation of glucose (or reducing sugars) in solution.
... measure to see if the procedure of measuring the concentration of glucose in a solution is correct.
Method for phase 1&2:
1. Using the plastic syringes introduce 10cm3 glucose solution and 5cm3 sulphuric acid into a flat-bottomed tube. Draw 2cm3 potassium manganate ...
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A colorimetric method for the estimation of glucose in solution
... tubes of Benedict's is so that one can be used for the unknown glucose solution, another as a control for the Benedict's.
I will then remove 5cm3 from each of the test tubes of glucose solution, place them in to ...
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A Colorimetric Method for the Estimation of Glucose in Solution.
... (seconds)
Concentration of Glucose (%)
A
0
872
872
Between 3 and 4
(approximately 3.8)
B
10
2346
2336
Between 1 and 2
(approximately 1.2)
C
20
696
676
Between 3 and 4
(approximately 3.2)
Conclusion
Once the potassium permanganate was added to the acidified solution the solution became purple in colour. The solution then gradually changes colour ...
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A study of Osmosis in plant cells
... a hypotonic solution and a hypertonic solution, the water molecules will pass from the hypotonic to the hypertonic solution by the process of osmosis, turning it into an isotonic solution.
Hypertonic Solution Hypotonic Solution Isotonic Solution
I will be conducting an ...
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A study of Osmosis in plant cells
... a hypotonic solution and a hypertonic solution, the water molecules will pass from the hypotonic to the hypertonic solution by the process of osmosis, turning it into an isotonic solution.
Hypertonic Solution Hypotonic Solution Isotonic Solution
I will be conducting an ...
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Adaptations of Small Intestine for Absorption
... Absorption
1. Simple sugars, amino acids, vitamins & minerals
l (diffusion)
blood capillaries of villi
l
hepatic portal vein
l
liver --- hepatic vein --- heart
2a. Soluble glycerol
l (diffusion)
epithelium of villi
2b. Fatty acids + ...
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Affect Of Varying Salt Concentration on Red Blood Cell Haemolysis
... The blood cells have a definite life cycle, just as all living organisms do.
Approximately 55 percent of blood is plasma, a straw-collared clear liquid. The liquid plasma carries the solid cells and the platelets, which help blood clot. Without ...
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Aim: To find out the water potential of potato cells using different concentrations of sucrose solutions.
... tiny invisible particles; the continuous movement of particles in liquids and gases causes the transport and mixing that we call diffusion.
During diffusion molecules move down a concentration gradient. (From high concentration to low concentration).it happens because kinetic energy passed ...
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Aim: To test for reducing sugars using glucose, sucrose and lactose to see which one can be reduced.
... will then give a positive Benedict's test. So sucrose is the only sugar that will give a negative Benedict's test before hydrolysis and a positive test afterwards. First test a sample for reducing sugars, to see if there are any ...
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Alleopathy
... this investigation is to see whether the allelochemicals produced by grass at germination inhibit the growth of wheat seeds.
Background:
What is allelopathy?
Allelopathy is any direct or indirect harmful effect by one plant (including micro-organisms) on another through the production of ...
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AN ACCOUNT OF NITROGENOUS EXCRETION IN MAMMALS Excretion is the disposal of the waste products of metabolism, example ammonia and urea from
... mainly concerned with nitrogenous waste, and to a less extent with other waste products of metabolism. The three compounds of importance in nitrogenous excretion of animals are ammonia, urea and uric acid. The amino group being removed from excess amino ...
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An Experiment Testing for Carbohydrates Non-Reducing sugars
... The boiling tube was placed in a water bath for 8
minutes. They were then removed and cooled. The colour was recorded.
1b 3cm³ 0.1% Glucose and 1cm³ Dilute Hydrochloric acid were pipetted
into a boiling tube. The boiling tube ...
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An experiment to find out the effect of different sucrose solutions on the growth of yeast.
... concentration varying from a high concentration to a low concentration of sucrose between the six test tubes, so it is able to see in which concentration the yeast grows best in.
Apparatus.
1) 6 test tubes
2) Haemocytometer
3) Test tube rack
4) 6 chronicle ...
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An experiment to study the effect of glucose concentration on respiration rates in yeast.
... line is less steep than the line for 4% glucose concentration. I will just make it clear that the only variable was the glucose concentration, all the other possible variables such as the amount of yeast or the temperature remained ...
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An Investigation into the effects of varying Concentrations of Sucrose solution on Plant tissue.
... molecules to pass through. There are more free water molecules on the left than on the right and so water molecules will pass more rapidly through the membrane from left to right than from right to left. However the sucrose ...
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An investigation into the osmotic properties of a kumara (sweet potato)
... concentrated solution of something like sucrose.
Plant cells have a strong cell wall surrounding them. When they take up water by osmosis they start to swell, but the cell wall prevents them from bursting. Plant cells become "turgid" when they ...
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An Investigation into the Water Potential Of Root Vegetables.
... of sucrose solution at which the vegetable will gain no mass. Once the isotonic solution is found for each vegetable, its water potential can be found by using a reference graph, which shows the water potential for different concentrations of ...
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An Investigation of the Variation of Electrode Potential with Electrolyte Concentration.
... was repeated to make a 0.0001 molar AgNO3(aq) volumetric flask and this in turn was used to make a 0.00001 molar solution.
With the five concentrations of AgNO3(aq), five electrochemical cells were constructed using 1.0 molar CuSO4(aq) as the ...