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Hi, I'm currently studying the AQA Human Biology syllabus and was asked to write up my results for the above experiment. This is the instructions for what we had to do:
1. Use a cork borer to cut out a cylinder of beetroot, then use a ruler and scalpel to cut the cylinder into a series of discs with uniform thickness (5mm is probably best) you will need at least 24 discs.
2. Rinse the beetroot discs by placing water in a Petri dish. This gets rid of any pigment which has spilled out of the cut cells.
3. Measure a fixed volume of distilled water (I suggest 10cm^3) into each of 6 test tubes. Add 2 beetroot discs to each tube.
4. Leave one at room temperature and place the other tubes in baths at other temperatures (use a good range). Note the thermometer reading in each bath do not assume that the temperature is that shown on the thermostat dial or the label.
5. Leave the tubes at your chosen temperatures for about 40 minutes (make sure the time is the same for each tube). This ensures that the contents of the tube have reached the temperature of the bath and been held at that temperature long enough to affect the cell membranes.
6. Remove all tubes at the end of the time alloted and separate the liquid from the beetroot discs. This can probably be done by decanting the liquid into another tube, leaving the beetroot disc behind.
7. Ensure that the liquid in each tube is thoroughly mixed, then use a colormeter to measure the absorbance of green light for each tube relative to the absorbance of a distilled water blank.
Now I have to analyse the results and describe the trend or pattern and explain what the results say about the effect of heat on cell membranes and explain how it occured and which molecules were effected and how.
I also have to identify which results I think is wrong or unreliable and consider how the errors may have occured and state whether there was anything I could have done to improve accuracy/reliability.
Please could you tell me how to go about this as I do not have any idea and this counts toward my final grade. I don't really have a clue how to do it.
Can you please help me on this question as much as possible.
My aim of my coursework is to investigate the effect changing the concentration of Hydrochloric Acid has its rate of reaction with Sodium Thiosulphate.
Please can you e-mail the answer or as much information as possible
Thanks a lot
(Could you please get back to me asap because i have an interim deadline for next week (monday 3rd) to get my plan done)
im doing my GCSE Maths statistics coursework (Edexcel) on Mayfield High School Data.
For children in KS3 and KS4, i have the following data:
Month of birth
Favourite type of music
Favourite TV programme
Average number of hours TV watched per week
Distance Between Home and School
Means of travel to school
No of siblings
No of pets
KS2 Results English
I was wondering if you could tell me which line of investigation would be the best in terms of allowing me to show the most skills. I was considering doin height and weight or some similar continuous data. How would i go about writing an 'integrated' detailed hypothesis and what would i need to include in my plan and the project (especially in terms of statistical skills i.e. histograms etc to score highly?
What is meant by the term 'regression analysis' and what is the formula i need to carry it out?
Finally, are there any resources/sites which could help me with this coursework?
Thank you so much for your help.
can you give me a brief introduction to osmosis in potatoes for a piece of coursework. is it any different to other osmosis?
I have been asked to investigate why the colour leaks out of cooked beetroot! please give me some information i could include in write up! thanks!
I did an experiment where I changed the concentration of hydrochloric acid to see how this would affect the rate of reaction. I reacted HCL with sodium thiosulphate. I kept the volume of sodium thiosulphate the same throughout each experiment (25cm3).
I altered the amount of HCL and water:
Volume of HCL (cm3) Volume of water (cm3)
1. 25 0
2. 20 5
3. 15 10
4. 10 15
5. 5 20
6. 0 25
25cm3 of sodium thiosulphate used each time.
For my evaluation my teacher says i need to get more marks...please help!
I got one anomous result. The results showed that as the concentration of HCL increases...the rate of reaction increases. I have to comment in detail on the reliabilty of the evidence, accounting for any anomalous results?????? Can you please name all of what could have happened in order for me to get the anomalous result??????
Please help...i really need the marks!
Thankyou so much!
According to the AQA syllabus, to gain the E.6b mark on my evaluation i need to, "describe, in detail, further work to provide additional relevant evidence".
What further investigation should i talk about to gain this mark and could you please explain how this is relevant . The investigation you suggest must be linked to Osmosis.
THANKS FOR READING THIS! :)
My coursework exp was to cut pieces of beetroot of the same size, wash them under running water -to remove pigment released from the cells damaged by cutting and sizing then place the pieces into test tubes of water at pre heated temps of 20, 30,40, 50, 55, 60 and 70 degrees. the betroot were added to these water temps for 15 mins,the now, red coloured liquid drained and kept to be analysed using a colorimeter. This was to determine at which temp the most pigment was released, as expected the hottest temps were coloured the deepest red colour.
I understand that this is due to the damage and denaturing of the cell membranes at high temps allowing the pigment to be released from the vacuole, but in my write up i want to comment on the reason for there being any pigment release at the lower temps, why is there any pigment released from what should be intact cell membranes at temps upto 40 degrees, is it to do with diffusion? however i thought the reason the pigment was held in by the membranes is because its molecules are too large to pass through the membrane? so how does this pigment leak out at the lower temps if all pigment from broken cells was washed off before heating?
Are there any key points you advise i mention in the write up?
Thanks in advance,
I did an investigation on the absorbtion of pigment from a beetroot in distilled water, and i set up 5 diffrernt tepertauere water baths for the beetroot to sit in.( 0, 20, 30, 40 and 55 degrees c ) And to explain what is happeningm i know it has something to do with the plasma membrane, and i think it has something to do with protiens, but i'm not sure- can you help?
ive just started my GCSE statistics coursework. im at a grammer school and am doing higher tier maths. for my statistics coursework, we are provided with all the figures and info but i have to do sampling and only use a small amount of the data.
i want to do height against weight but how do i do the sampling? also am i meant to use a range of graphs?
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