Qualification > Sciences
ALL CIE BIOLOGY DOUBTS HERE !!!
Vampire-Love4ever:
--- Quote from: Sue T on May 17, 2011, 02:19:13 pm ---ok so as promised, Vampire-love - here r th answers 2 ur previous posts ;)
first for ths one u dont really need 2 bother about that - there are lots of other points you could write - but anyways you can always say to use a protractor to measure th curvature - just state it like that u dont need to include so much detail :-\
1bi and ii) the marking scheme is messed up - they can always be rong u no!
here is wat u shod get: mean for tissue A = 56 sA= 2.357 and SM= 0.75
mean for B = 123.3 sB=2.312 and SM= 0.73
the bar chart will become hard 2 draw with its error bars once you get these values - but dont worry its their fault :p its just a specimen paper...
thats it - good luck 2moro ;) cya!
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Thank you my dear! ! ! :D See you after 8 hours! :D
Vampire-Love4ever:
Any risk assessed by using hydrogen carbonate solutions?
Amelia:
--- Quote from: The Secret on May 17, 2011, 10:16:37 am ---What I meant is how would you know the shape of Cu ions, like why can't you say that it competes with the substrate and it becomes a competitive inhibitor?
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Because it's sort of a fact that metal ions do not attach themselves to the active site of the enzyme. Hence, they are not 'competing' with the substrates. They are simply changing the shape of the enzyme. This will explain better.
--- Quote from: The Secret on May 15, 2011, 08:36:26 am ---Specimen paper 2001, Q3 a iii) - What's the answer?
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I'm not sure about this question. Maybe, because protease works at a range of pH and it is difficult or inaccurate to deduce the range for the graph.
--- Quote from: The Secret on May 15, 2011, 08:36:26 am ---Specimen paper 2001, Q4 is about genetic engineering, is that part of our syllabus?
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Yes, it's included. It'll be easy to solve this question, once you learn the concept.
--- Quote from: The Secret on May 15, 2011, 08:36:26 am ---Specimen paper 2001, Q3 b) - What's the answer?
--- End quote ---
Optimum temperature for the enzyme protease to work upon.
Amelia:
--- Quote from: Nidzzz on May 17, 2011, 09:10:23 am ---Explain why sickle cell anaemia is common in areas where malaria is endemic ?
0/n 6b p2
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Sickle-cell anaemia provides protection against malaria. The parasite cannot survive in the blood cells of a person who has got the heterogenous sickle cell genes.
Individuals carrying just one copy of the sickle mutation (inherited from either the father or mother) were known not to develop sickle cell anemia, leading rather normal lives. However, it was found that these same individuals, said to carry the sickle cell trait, were in fact highly protected against malaria, thus explaining the high prevalence of this mutation in geographical areas where malaria is endemic.
**RoRo**:
--- Quote from: Amelia on May 18, 2011, 05:23:37 pm ---Because it's sort of a fact that metal ions do not attach themselves to the active site of the enzyme. Hence, they are not 'competing' with the substrates. They are simply changing the shape of the enzyme. This will explain better.
I'm not sure about this question. Maybe, because protease works at a range of pH and it is difficult or inaccurate to deduce the range for the graph.
Yes, it's included. It'll be easy to solve this question, once you learn the concept.
Optimum temperature for the enzyme protease to work upon.
--- End quote ---
THANK YOU! :D
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