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  726 A Level Biology questions
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Yeast and Methylene blue

In a practical the pupils have 3 boiling tubes of yeast. Tube C is boiled for 5 mins. Then we add methylene blue to all 3 boiling tubes adn put in a water bath at 40oC. Tubes A and B obviously go colourless because of respiration and tube C doesn't because the yeast is dead. We then shake tube A and goes blue again - obviously reoxygenating the methylene blue. Tube B, however is boiled for 5 mins, then shaken and it does not go blue again. How come the methylene blue isn't just being reoxidised from the air? How come the yeast needs to be live for the methylene blue to be reoxidised? Thank you

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effect of glucose concentration to yeast respiration

Hello :) i am doing an investigation about the effect of increasing substrate (glucose) concentration on the rate of respiration in yeast.. i hv carried out an investigation, and using d range of concentration from 1% - 5%.. and got a pretty weird result... like for d 5%, there are 159 bubbles produced in 10 mins.. and for 4% , there're 78 bubbles produced in 10 mins.. is it possible to reach no.of bubbles that many? since i read one of d article on net abt a student that did d same thing, but she uses 10%-30% glucose concentration.. and only get about 70 bubbles for d 10% in 5 mins..

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incipient plasmolysis

im doing coursework on plasmolysis of red onion cells
my results are a bit weird as i didnt get no 50% reading the highest percentage of cells showing plasmolysis i have is 22%
does this mean ive done it wrong should i just explain anomalies etc to explain my results???? reply asapp pleaseeeeeeeeeeeee

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biology

explain why please facilitated diffusion is a passive process

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Inactive enzyme!

What is an inactive enyzme and what are the conditions it can be made active again!

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why are there more boys born than girls

Hello,
I have been asked to find the scientific answer for the above 'title' question. I have tried to search on search engines but it does not give me the answer. I hope you will be able to tell me the reason. I have a feeling it is to do with the X and Y chromosome.

Another question which i would like to know the answer is the difference between phenotype and genotype.
Is phenotype the physical characteristics of an organism?
And genotype the inherited characteristics which are found as genes/alleles?


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Chromatography of photosynthetic pigments?

For my coursework, I have separated and identified the photosynthetic pigments in a leaf by chromatography. The aim is simply to separate and identify the pigments. I have already conducted the experiment and calculated the Rf values. The experiment is included in the booklet of suitable coursework in which I have to include a statistical test, hypothesis and null hypothesis. I believe a t-test would be suitable, however, I do not understand what I could predict.

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ocr planing exercise

what is the best method to use when investigating the effect of different concentrations of gibberllin on amylase activity in germinating cereal grains

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caliration graph for glucose

Do you know where i can get the calibration graph for glucose that shows the highest absorbance of 1.8. please can you help me with, i tired to figure it out but the outcome is poor.

thank you

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spectrophotometer

What is the principle behind the working of the spectrophotometer?

Look forward to yr reply.

  726 A Level Biology questions
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Christian Louboutin outlet

November 4, 2014 | A Level Biology Coursework
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Difficulty: Very Hard | Reward: 12 SZPoints

Status: Unanswered | Comments: 0

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MBT Sandalias Mujer: mbt.me.uk

November 4, 2014 | A Level Biology Coursework
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Difficulty: Easy | Reward: 2 SZPoints

Status: Unanswered | Comments: 0

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???? ????? ??? ??????

September 29, 2014 | A Level Biology Revision
Contributors:

Difficulty: Hard | Reward: 6 SZPoints

Status: Unanswered | Comments: 0

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Essay - names of Microorganisms

October 30, 2012 | A Level Biology Coursework
Contributors:
Alan

Difficulty: Average | Reward: 3 SZPoints

Status: Unanswered | Comments: 1

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Factors that cause the rate of osmosis to increase

September 25, 2008 | A Level Biology Homework
Contributors:
sarah lilly sofa sofa David malak

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 6

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Statistics... =(

August 31, 2008 | A Level Biology Coursework
Contributors:
lilly shamim

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 2

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biology A2 coursework

August 26, 2008 | A Level Biology Coursework
Contributors:
shamim

Difficulty: Hard | Reward: 6 SZPoints

Status: Answered | Comments: 1

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yeast respiration

August 19, 2008 | A Level Biology Homework
Contributors:
anton malak

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 2