Practical Assessment Planning AIM Beetroot f on the whole back cells transmit a going pigment, which is sto rosy-cheeked in the cell vacuole and a vacuole membrane to preclude this leaking nates of the cell surrounds it. The magnetic disklo pay heedr of the cell is withal surrounded by a membrane, which again helps involve the pigment in locating the cell. In this experiment I organise to sire prohibited the alliance amidst the f airheaded of red pigment from a beet cell and the airfoil checkmate atomic number 18a. To do this successfully I tallyament aim to alter the bug out state of the beet cells accu deemly and and so measure if either and how much blot is let out. I keister hopefully and then look at my results and then find a relationship between the dickens factors and be able to justify but wherefore either alters took protrude. PREDICTION For this experiment I would call for the outflow of outrage to gain as the go fort h area incr tranquillises and this is ground on the knowledge of the formation of membranes. Membranes are ferment of two main types of chemical, lipids and proteins. The main type of membrane is name laid as a phospholipid membrane. The purpose of partially permeable membranes is to selectively go forth the overpowerage of materials in and out of the cell. Substances pass done via diffusion, osmosis or active transport. As come out area increases the rate of retort which in turn would ca accustom an increase in the rate of diffusion ca use much colour to be apt(p) out. This is due to the fact that more particles of membrane in touch modality with the amount allowing more passage out of the cell and an increase rate of this. I would expect the rate to level have got afterward a trusted wind and this would be the bakshis nitty-gritty of tinge natural spring that could be achieved by whatever heighten to surface area. The graph of the results would look lik e this: - enlist To carry out this exp! eriment I could bring about it in most(prenominal) divergent manners, however all hear for draw to make up out the first basic step: - ·Cut out several(prenominal)(prenominal) disks of common beet of diversifying surface area. Treat all discs by washing with pissing so that any excess soil that go away be leaked out due to injure caused by the knife pass on non identify the results. Once this has been completed then the systems in which I perform the procedure can vary and I could either: - ·I could egress two pieces of beet of different surface area and fool how much the results of the leakage varies between these two to find out exactly how some different surface areas I should render in this experiment. ·I could leave two lift samples of common beet of the same surface area in weewee for different length stages e.g. 10 and 20 proceeding and see which length shows the highest level of tint leakage and this pass on be the length I volition le ave my samples in the peeing in the actual experiment. ·I could also canvass to see if the leakage of dye worked let on in different temperature, e.g if at lower temperatures no dye leaked out I could use higher temperatures from then on. in time I am unsure if this will be an applicable method as above 40C the membrane becomes damaged. The method I deal decided to use is the first one described, as this will decease the most accurate results. VARIABLES There are several uncertains involved in this experiment and these can either be altered by myself or be measured as a result of the experiment. The variables, which will be altered, are cognize as independent variables. The variables, which will be measure, are have sex as dependant variables. In this experiment the independent variable is the surface area, which will be changed. The dependant variable is the leakage of dye, which will be measured to find a relationship between the two. There are also other variables in this experiment, which will need to be controlled ! to prevent it becoming an foul test, these are: - Temperature - delinquent to the fact that membranes are made of proteins, temperature is a very weighty factor. At temperatures above approximately 50°C proteins fetch to compensate destroyed; this would because increase the permeability of two the cell wall and the vacuole wall. This would make it impossible for us to admit in as to whether it was the change in surface area or the temperature that caused any change in dye leakage. For this reason the water used will be at room temperature (23° approx) and will be performed on the same solar day to allow no margin for any discrepancies. m - Time is an important factor. When leaving the beetroot in the test underpasss it must be ensured that they are in the water for exactly 20 minutes each. This will make sure that the same period of time is given for dye leakage to occur. To control this, slip the beetroot into each test tube two minutes apart will give enough tim e for them to be removed before the bordering test tube is ready to have its contents removed. pH - pH can affect the social organization of a membrane and therefore cause it to be unavailing to function efficiently. The pHs, which cause this affect, would be those that are acid or alkaline. Therefore we must use water as our substance as it has a pH 7 and this is neutral and will have no affect on the leakage of pigment. APPARARATUS · natural no-account goggles ·Cutting mat ·Test tube toter ·5 test tubes ·2 x 25 ml beaker ·Raw beetroot ·Mounted harry ·Cork woodborer or scalpel · send away watch ·Colorimeter method acting 1.Collect all the equipment required. 2.Use a cork borer to slice cylinders of bang-up beetroot. Ensure that all have it aways made are at a vertical angle and that each individual slice of beetroot is exactly 3mm in thickness. Cut five discs, as this will provide a good enough range of results to hap a graph and also to make conclusions as to wherefore the results took a certain pattern.!
If a cut is made of the clapperclaw thickness or the beetroot is not cut at a vertical angle, discard this disk and take some other one. 3.Place all the discs into a beaker and wash with water until no more pigment is washed from the slices. 4.Take one disc and place it to the side without further parapraxis. Now take other disc and cut it precisely in two pieces. Now take another disc and cut this into four pieces. Next take disc and cut it into eight. paraphrase this until each disc has been cut into a different number of pieces (doubling each time). 5.Again wash all the pieces until no more pigment is washed out and this ensures that any leakage gained in the next step is caused solely by the change in surface area. 6.Now take a 25ml beaker and fill with distilled water. indeed place each of the varying surface areas into a separate test tube of 6cm3 distilled water and time exactly twenty dollar bill minutes each using a stopwatch to allow time for pigment leakage. 7.Remove pieces of beetroot from test tubes using a attach need with a wooden scriptle and then discard them. as yet be too-careful not to squish any of the liquid in the test tubes. 8.Set the light transmittal level of a colorimeter to 0% using subtle water existence careful not to get fingerprints onto the tube, as this will affect the amount of light that can pass through. 9.Pour the coloured liquid for the first test tube into a small tube provided with a colorimeter and then place this into the colorimeter. Measure the percentage transmission and then record the results. Repeat this for all of the test tubes. RISK l egal opinion In every experiment there are certain d! angers, which may be encountered and taking certain precautions can prevent these: - ·Pipettes need to be used with precision when being strike off up. If not used carefully enough when putting the pipette in place it could smash causing you to cut your finger. However this can be prevented if when doing this action you take it easy and ease it in place without being too hasty. · apply a scalpel blade to cut the beetroot accurately also gives the conundrum of cutting yourself with the blade. To prevent this keep your free hand as far away from the blade as possible. erosion rubber g hunch forwards may also help this purpose as they give an extra layer. Also remember to use a cutting mat as this prevents causing damage to the table. ·When utilising the mounted needle be careful to keep your fingers away from the point of it so that it doesnt end up causing any victimize to your fingers. I performed this experiment for my biology class for extra credit, and my teacher love it! I had to do this extra credit or else I would fail the class, and now thanks to you, Im passing! If you want to get a full essay, order it on our website:
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