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Hepatic Portal Vein

Why is it that the hepatic portal vein contains variable amount of glucose during the day?

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sucrose solution strengths

Hi, I am at planning stage for investigating water potential of potato cells. Method is to use sucrose solutions of different strengths i.e. 0.1M, 0.2M etc but I dont actually know how to get the exact quantities accurately. Can I use teaspoons or pipette & count the drops? I am doing this as home study. Am I exposing myself as having a major bolt lose in my head?!!

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Ecology coursework

following my previous question about scientific theory needed for my ecology coursework which was the effect of trampling on thistle on Burford Spur surrey, so do i need to look at the adaptations of this plant to trampling is there any theory that i need to include anything to do with plant growth/soil conditions? Can you suggest any websites/books for natural selection?


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A2 biology coursework

i am doing an A-level coursework on the effect of trampling on the plant stemless thistle on the Burford Spur, Box Hill TQ 175 520. I am measuring the length of thistle leaves, soil depth,PH and temperature in a trampled and untrampled area using random sampling. For this inv estigation i am not sure what scientific background information i need to address in my coursework i need help the only thing my teacher has told me is that the bacground information should include primary/secondary succesion. Could you please provide me with biological theory that i can research which is related to the title of this coursework?

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Investigaing the effects of trampling on a designated area: interpreting data on statistical test.

For my A2 coursework I must choose an appropriate statistical test which is most suited to my data and title : To investigate the effects of trampling on the Burford Spur, Box hill- Surrey (TQ 175 520.)

Using a transect and quadrat measuring 0.50 by 0.50m I recorded the length of a longest plant species, the soil depth, soil PH and soil temperature up to starting at 0.0M up to 0.9M (along the transect.) This was done twice, on two seperate areas- being relatively near eachother. I began at a path (being the most trampled area) and worked my way into grassland (being the least trampled area.)

As part of my coursework, governed under 'section E: Statistical test'
I must choose one of the following statistical tests which are most appropiate:

*Students t test & Mann Whitney U test (which looks at differences) OR

*Spearman’s Rank correlation coefficient (which tests the strength of a relationship)

I'm lead to believe that the most suitable statistical test would be the Mann Whitney U test as this statistical test assesses whether two samples of observations come from the same distribution...
However, I’m not entirely sure so I've come to a halt. Please give me helping hand.

Thanks in advance.

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Ecology coursework: To investigate the effects of trampling on the Burford Spur, Box Hill (surrey) T

For my A2 coursework I must choose an appropriate statistical test which is most suited to the coursework title and given data (entitled 'results table- ecology.)
I must choose one of the following statistical tests:
*Students t test/Mann Whitney U test (which looks at differences)
OR
*Spearman’s Rank correlation coefficient (which tests the strength of a relationship)
I'm lead to believe that the most suitable statistical test would be the Mann Whitney U test. However, I’m not entirely sure so I’ve hit a dead end an it‘s making my summer hell. Please shed some light.
Thanks in advance.

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Beetroot and pH

How do you know how much of solutions to use and how big to cut things like beetroot? To test the effect of pH on beetroot cells would you suggest using pH buffers or something else?

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Barnacles

Hey
Im currently doing my A2 level Biology coursework on "the effect of the salinity of sea water on the rate of a barnacles cirri beats". i understand that it is to do with osmosis etc. but i dont know how to start my methodology for my plan. for example, what salinity levels should i measure and how should i measure them?? would be extremely grateful of your help!!

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my lab

thank u 4 the help. But check this part out. I did an experiment and when the oil was added to the yeast the oil began to rise, and the yeast rose afterwards. During the occasional rising of the yeast, bubble appeared in the lime juice. As the oil settled at the bottom of the test tube, and the yeast settled at the top.
Can u say why all of this occurred please?

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my lab

what causes yeast to respire aerobically or how does yeast resoire aerobically. I have gotten a lab to show how yeast respires aerobically.

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

September 29, 2014 | A Level Biology Revision
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Difficulty: Hard | Reward: 6 SZPoints

Status: Unanswered | Comments: 0

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réplicas de bolsas

September 26, 2014 | GCSE Level Biology Revision
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Difficulty: Very Hard | Reward: 12 SZPoints

Status: Unanswered | Comments: 0

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hermes réplica relógios

September 15, 2014 | KS1 Level Biology Revision
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Difficulty: Very Easy | Reward: 1 SZPoints

Status: Unanswered | Comments: 0

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Heren Running Shoes

September 10, 2014 | AS Level Biology Advice
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Difficulty: Hard | Reward: 6 SZPoints

Status: Unanswered | Comments: 0

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osmosis and diffusion!!!!!!!!

December 3, 2010 | AS Level Biology Revision
Contributors:
Saba malak

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 2

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Isozymes

Contributors:
Saba Saba Latiff

Difficulty: Hard | Reward: 6 SZPoints

Status: Answered | Comments: 3

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Diffusion

Contributors:
george

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 1

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BIOLOGY

Contributors:
lilly Jenny

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 2