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    (Original post by Saldudsjen123)
    I put almost the same but because it was talking about phylogenetic I said that the two species which had the same nucleotide sequence had a more recent common ancestor and the other had a more distant common ancestor?:/
    I was fearing for that. I think you are right. I just talked about the two with the same nucleotide base sequence are more closely related than the one is to the two as its nucleotide base sequence is very different. :/ Well done though.
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    For the reliablity queation I said that theyve used percentages which allows for comparison, correct?
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    (Original post by CourtlyCanter)
    I talked about DNA hybridisation and compare the separation temperature of the mixed one to that of a normal bacterium. Any significant deviations from the normal one(doesn't matter which one you use I suppose, if they were indeed identical that is) would mean that they are not identical bacteria.
    How can you talk about Dna hybridisation when they are the same species


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    (Original post by Suits101)
    Did anyone know what other conclusions scientists could make for that artery question? I had no idea.
    I put that carbs is taken into the blood at a higher rate than fats and proteins, followed by fats and then proteins.
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    (Original post by Suits101)
    What did you put for the species diversity one?

    The one about making conclusions and then the one about what additional steps should be made?

    I said that no definite conclusion can be made because both conclusions contradict each other.

    For addition steps, I said repeat the investigation by another group to identify and reduce the effect of anomalies, share findings and use statistical tests to see if results are significant/due to chance?
    Remind me what the context was regarding the species diversity thing you are referring to? It's been a long day haha
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    (Original post by Amellia123)
    I think someone has done an answer for this further back (sorry I cant remember!). I put something along the lines of 'bacteria in human faeces more likely to spread and infect other humans than bacteria in animal faeces as strains may be different'

    I think it specified for humans?

    I highly doubt that is right, all I did was waffle on for too long :lol:
    Agar plate? Contamination from other bacteria ???????...
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    (Original post by cutelady)
    How can you talk about Dna hybridisation when they are the same species


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    I thought you had to prove if they were the same species. If they were given as the same species then what was the point of the question? I may be wrong.
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    (Original post by CourtlyCanter)
    Remind me what the context was regarding the species diversity thing you are referring to? It's been a long day haha
    Something like another scientist calculated the index of diversity of the river with the sewage and obtained a high index of diversity, whilst the other person calculated a low species of diversity - how does this new index of diversity affect the conclusions made or something?

    (Original post by cutelady)
    How can you talk about Dna hybridisation when they are the same species


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    What did you put for that question?

    I think I said compare the DNA base sequence.

    Since the question said to identify if they're identical I said that the DNA base sequence would need to be identical for them to be of the same species or whatever it was.
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    I wrote DNA hybridisation too, explained how if they had similar base sequences then they would seperate at the same temperature as the DNA stand found in the E.Coli in humans.
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    [QUOTE=CourtlyCanter;65543287]I am pretty sure they asked us to estimate the number of chloroplasts in the mesophyll cells in a leaf, not a cell.

    I'm pretty sure they asked us how to calculate the mean number of chloroplasts per mesophyll cell.
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    (Original post by Suits101)
    Something like another scientist calculated the index of diversity of the river with the sewage and obtained a high index of diversity, whilst the other person calculated a low species of diversity - how does this new index of diversity affect the conclusions made or something?



    What did you put for that question?

    I think I said compare the DNA base sequence.

    Since the question said to identify if they're identical I said that the DNA base sequence would need to be identical for them to be of the same species or whatever it was.
    Ah right. It asked us about how no conclusions can be drawn after the new set of results have been recorded by the 2nd scientist. I said the results obtained are not in agreement with each other and so no valid conclusion can be drawn as there is no way one can tell as to which scientist was right.

    The follow-up question on a way in which they can find the species diversity was by both scientist agreeing on a method of investigation that they both think would provide valid and representative results and actually do it, do repeats if possible.

    Not entirely sure if I'd hit the nail but oh well.


    Do you agree on the DNA hybridisation thing?
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    (Original post by CourtlyCanter)
    Ah right. It asked us about how no conclusions can be drawn after the new set of results have been recorded by the 2nd scientist. I said the results obtained are not in agreement with each other and so no valid conclusion can be drawn as there is no way one can tell as to which scientist was right.

    The follow-up question on a way in which they can find the species diversity was by both scientist agreeing on a method of investigation that they both think would provide valid and representative results and actually do it, do repeats if possible.

    Not entirely sure if I'd hit the nail but oh well.


    Do you agree on the DNA hybridisation thing?
    I agree with the first question.

    I mentioned about repeats for second one.

    My first thought was DNA hybridisation but I don't know why I just said to compare the DNA base sequence for the same gene and if they're identical then they're of the same species - but I believe DNA hybridisation should be right.
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    I have seen conflicting views about the mean chloroplasts....was it per cell or per leaf....I initially thought per leaf but changed my mind to per cell....simply because of the wording of the question was 'number of chloroplasts in a palisade cell in a leaf....not number of chloroplasts in a cell.... If it meant in a leaf surely the cell would be cells (plural) not cell


    but could be wrong
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    (Original post by Suits101)
    I agree with the first question.

    I mentioned about repeats for second one.

    My first thought was DNA hybridisation but I don't know why I just said to compare the DNA base sequence for the same gene and if they're identical then they're of the same species - but I believe DNA hybridisation should be right.
    I'm pretty sure they will accept either response. I also spoke about the comparison of the sequence of bases. However they said describe ONE method and one was in bold, thereby meaning that there are a variety of methods to choose from. We should be fine.
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    (Original post by CourtlyCanter)
    I was fearing for that. I think you are right. I just talked about the two with the same nucleotide base sequence are more closely related than the one is to the two as its nucleotide base sequence is very different. :/ Well done though.
    Thankyou,although I'm still not sure I'm totally right either,because what you said makes sense:/
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    (Original post by lahigueraxxx)
    I'm pretty sure they will accept either response. I also spoke about the comparison of the sequence of bases. However they said describe ONE method and one was in bold, thereby meaning that there are a variety of methods to choose from. We should be fine.
    Did it? Brilliant!

    What did you write exactly?

    My response is on your previous quote thingy.
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    (Original post by Suits101)
    Did it? Brilliant!

    What did you write exactly?

    My response is on your previous quote thingy.
    My response was very similar to yours:

    -Compare the sequence of their DNA bases
    -The higher the percentage similarity in the order of the bases, then more closely related the species of bacteria ( and so the more likely the bacteria are from the same species)
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    (Original post by lahigueraxxx)
    My response was very similar to yours:

    -Compare the sequence of their DNA bases
    -The higher the percentage similarity in the order of the bases, then the bacteria are from the same species
    I think I'll subtract a mark just in case from my response.

    Thanks though you've helped a lot!
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    (Original post by Suits101)
    I think I'll subtract a mark just in case from my response.

    Thanks though you've helped a lot!
    You're welcome! I'm very sorry if this turns out to be wrong haha, but it shouldn't do
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    Ordo Don't know if these will be of help but here you go.
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    The Temporary Mount question
    (Original post by CourtlyCanter)
    I just put something along the lines of ....take a cross-sectional sample of the leaf and place it in an isotonic solution to prevent damages to the cells due to osmosis of water and the breakdown of the cells by the leaf's own enzymes. Stain the tissues to allow identification of the different cells in the leaves.
    The Width of the leaf from top to bottom
    (Original post by CourtlyCanter)
    I think I did (6.6/1.6)x50= 206.25= 206 micrometer?
    What is a leaf?
    Organ
    The question about why is the DNA between 1 and 2 arb units
    (Original post by CourtlyCanter)
    I put the cells are undergoing DNA replication.
    Not entirely sure.

    What does a phylogenetic tree show?
    (Original post by CourtlyCanter)
    I just put sth like... It shows the relationships between different species that are genetically related.
    Advantage of the graph where the blood flow decreased during exercise
    (Original post by CourtlyCanter)
    I just said ppl with that thing (starts with an a, can't remember what it was) have haemoglobin that have a low oxygen affinity. This means they take on oxygen less easily but unload/dissociate them more readily. (The following was a complete guess) This means these people can move/exercise quicker as there is more oxygen for the cells respiring aerobically during an exercise and a higher rate of respiration means more energy is produced in the form of ATP.
    The one about air reaching the cells of an insect-
    (Original post by CourtlyCanter)
    As it was asking about the movement of air (I think), I just put air enters into tracheal system through spiracles and into the tranchae and then tracheoles which go directly into the cells. Oxygen diffuses into respiring cells down the oxygen concentration gradient. It can diffuse out as trachioles are thin and permeable to gases like oxygen and CO2.
    The sewage one on diversity loss-
    (Original post by CourtlyCanter)
    Ye I said something along the lines of.... Sewage may cause changes to the water like its pH which is an example of abiotic factors. Changes to abiotic factors mean less species are adapted to living in this area ( should've mentioned habitat loss and something like niches for some species no longer in place as a niche has all the biotic and abiotic factors that a species requires for it to survive, reproduce and maintain a viable population.). With less species living there, less varied food sources and so only a few species would be adapted to live in this water. They would dominate the area.
    The estimation of the mean number of chloroplasts in that leaf-
    (Original post by CourtlyCanter)
    I wrote it out in words but because I had so much stuff crossed out I decided to write it out like an equation under the wordy bit.The equation was basically-(Total cross-sectional area of the leaf)/(Cross-sectional area of the temporary mount) x (mean number of chloroplasts in mesophyll cells per temporary mount I wrote about taking a few temporary mounts samples and finding the mean number of chloroplasts in the wordy bit ) = (mean number of chloroplasts in mesophyll cells of a leaf)
    Why UK animal feed don't all contain anibiotics.
    (Original post by CourtlyCanter)
    Uh I didn't talk about horizontal and vertical translations :/ I did however mention it would render the existing antibiotics used useless.
    Pretty sure I dropped marks on this.

    Do the Table and Figure support the scientists' conclusion regarding there should be no vigorous exercises after a meal-
    (Original post by CourtlyCanter)
    I said both the table and figure did not support the conclusion as the table thing regarding the different meals taken did not specify who the subjects were, how many of them there were and if their meal size was consistent. I also said the figure didn't specify when the volunteers have last had their meals and if they had done the same 'vigorous exercise'.
    How have the scientists increased the reliability of their results.
    (Original post by CourtlyCanter)
    I talked about samples from 46 farms ->large sample size->minimises effects of chance -> more representative results.
    A way to see if the 2 types of bacteria, one from the farmer and one from another thing, were identical by using DNA-
    (Original post by CourtlyCanter)
    I talked about DNA hybridisation and compare the separation temperature of the mixed one to that of a normal bacterium. Any significant deviations from the normal one(doesn't matter which one you use I suppose, if they were indeed identical that is) would mean that they are not identical bacteria.
    The scientists followed strick safety guidelines when collecting samples of faeces. Apart from the risk of contamination from e.coli this was especially important when collecting
    Explain why-
    (Original post by CourtlyCanter)
    I just put there may be other dangerous bacteria present in the faeces.
    what other conclusions scientists could make for the data collected- (Mesentric artery question)
    (Original post by CourtlyCanter)
    I put that carbs is taken into the blood at a higher rate than fats and proteins, followed by fats and then proteins.
    Another scientist calculated the index of diversity of the river with the sewage and obtained a high index of diversity, whilst the other person calculated a low species of diversity - how how no conclusions can be drawn after the new set of results have been recorded by the 2nd scientist-
    (Original post by CourtlyCanter)
    I said the results obtained are not in agreement with each other and so no valid conclusion can be drawn as there is no way one can tell as to which scientist was right.The follow-up question on a way in which they can find the species diversity was by both scientist agreeing on a method of investigation that they both think would provide valid and representative results and actually do it, do repeats if possible.
 
 
 
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