Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
hissyfit:
Samia 99 on The student Room made this,just wanted to share it with others as an example...
Cut Equal sized pieces of tissue Then rinse under water 2 remove all the pigment released by cutting .Place the pieces in Equal volumes of Distilled water using a range Of Temp & leaving for Equal time
Remove pieces carefully & shake each solution gently 2 disperse any pigment. Assess amount of pigment lost using a colorimeter 2 measure da absorbance/transmission value of Solution & FINALLy plot Results on graph . Temp on x-axis & Absorbance on y ...
Effect of temperature on cell membrane (beetroot)Control-using different temperatures
Organism- using the same beetroot,with the same surface area for all temperatures
Repeat-experiment repeated twice+average taken
Measure-measuring pigment leakage(arbitrary units) over time (mins) @ diff. temperatures (degress celcius).
Same-keeping temp as constant as possible.
If there are any mistakes please post.
Thanks
hissyfit:
How can a mutation in a gene switch cause anatomy to evolve,without the gene changing?
I don t get this, if there is a change in the gene switch the gene won t be transcribed normally,so the gene will change,no?
sasha7amad:
Can we discuss the practical 3b yet?
The Golden Girl =D:
You're NOT allowed to discuss anything unless 24 HOURS have passed.
Uchia:
if that is the case I would then care for the discussion cz we have to forget about the paper to focus on the other exams
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