AQA Biology AS New Spec - 26th May and 7th June

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    would dna is longer than rna get a mark for differences between them?
    Also Y was clearly a channel protein, if I jusst said it has a role in facilitated diffusion would it be right?
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    Isn't the reason why the substitute enzyme worked due to degeneracy of triplet code so different primary structure but same secondary structure and tertiary structure so active site complementary to active site

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    (Original post by 10moxoma)
    would dna is longer than rna get a mark for differences between them?
    Also Y was clearly a channel protein, if I jusst said it has a role in facilitated diffusion would it be right?
    Differences is 1) pentose sugar in dna is Deoxyribose but in RNA ribose 2) rna has uracil as a base instead of thymine 3) rna is a single strand but dna is double

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    (Original post by Lemauricien)
    Differences is 1) pentose sugar in dna is Deoxyribose but in RNA ribose 2) rna has uracil as a base instead of thymine 3) rna is a single strand but dna is double

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    Yes but dna is a lot longer than rna, are those^^ the only possible answers?
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    (Original post by 10moxoma)
    would dna is longer than rna get a mark for differences between them?
    Also Y was clearly a channel protein, if I jusst said it has a role in facilitated diffusion would it be right?
    yes i think it does
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    (Original post by GabbytheGreek_48)
    yes i think it does
    for which one?
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    what did people put for the role of protein y?
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    (Original post by Lemauricien)
    Differences is 1) pentose sugar in dna is Deoxyribose but in RNA ribose 2) rna has uracil as a base instead of thymine 3) rna is a single strand but dna is double

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    have many other differences like the fact that rna is straight and dna has helix they usually have a lot of different answwers for questions like that
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    (Original post by 10moxoma)
    for which one?
    rna one sorry not sure bout the other one though
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    (Original post by 10moxoma)
    what did people put for the role of protein y?
    i think that you had to talk about the role of channel proteins (e.g. transport of charged particles).. I
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    (Original post by 10moxoma)
    would dna is longer than rna get a mark for differences between them?
    Also Y was clearly a channel protein, if I jusst said it has a role in facilitated diffusion would it be right?
    It already told you in the question it helped with diffusion, so maybe not.
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    (Original post by Lemauricien)
    Isn't the reason why the substitute enzyme worked due to degeneracy of triplet code so different primary structure but same secondary structure and tertiary structure so active site complementary to active site

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    Different base pairing changes how proteins fold so no this is incorrect, as nitrogen bases contain N - H bonds which allow them to hydrogen bond to other nitrogenous bases hence different base pairing affecting folding
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    (Original post by Lemauricien)
    Differences is 1) pentose sugar in dna is Deoxyribose but in RNA ribose 2) rna has uracil as a base instead of thymine 3) rna is a single strand but dna is double

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    was it 3 marks for that q?
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    (Original post by cxxk)
    was it 3 marks for that q?
    I didn't even do the exam, but I know thats the possible answers haha

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    (Original post by Splaffie)
    Different base pairing changes how proteins fold so no this is incorrect, as nitrogen bases contain N - H bonds which allow them to hydrogen bond to other nitrogenous bases hence different base pairing affecting folding
    Ah I didn't even do the exam I'm just basing off what I'm hearing , whar was the wording of the q?

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    (Original post by Lemauricien)
    Ah I didn't even do the exam I'm just basing off what I'm hearing , whar was the wording of the q?

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    It was a substitute of propylene glycol between the glycerol molecule and 3 fatty acids, there wouldn't be an ester bond but I'm pretty sure the question would have nothing to do with ester bonds because you're not told the structure of the propylene glycol molecule, what I believed they were looking for was another classic 'different molecule shape means the lipase enzyme cannot act on it due to the need for a complementary shape for it to be able to bind with the active site therefore cannot form an enzyme-substrate complex and therefore cannot be catalysed and broken down' like atleast 5 other questions in the exam
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    (Original post by Lemauricien)
    I didn't even do the exam, but I know thats the possible answers haha

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    It was a 3 mark question with 4 possible answers;
    DNA contains deoxyribose mRNA contains ribose
    DNA is double stranded mRNA is single stranded
    DNA has the based Guanine Adenine Cystosine and Thymine whereas mRNA has Uracil instead of Thymine,
    and the fourth which you didn't mention was that DNA contains both introns and exons whereas introns have been spliced out and the exons joined together in mRNA
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    (Original post by Splaffie)
    It was a substitute of propylene glycol between the glycerol molecule and 3 fatty acids, there wouldn't be an ester bond but I'm pretty sure the question would have nothing to do with ester bonds because you're not told the structure of the propylene glycol molecule, what I believed they were looking for was another classic 'different molecule shape means the lipase enzyme cannot act on it due to the need for a complementary shape for it to be able to bind with the active site therefore cannot form an enzyme-substrate complex and therefore cannot be catalysed and broken down' like atleast 5 other questions in the exam
    that is exactly what i put
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    (Original post by Splaffie)
    It was a 3 mark question with 4 possible answers;
    DNA contains deoxyribose mRNA contains ribose
    DNA is double stranded mRNA is single stranded
    DNA has the based Guanine Adenine Cystosine and Thymine whereas mRNA has Uracil instead of Thymine,
    and the fourth which you didn't mention was that DNA contains both introns and exons whereas introns have been spliced out and the exons joined together in mRNA
    Can someone pleeease tell me what the answer was on the first page about semi conservative replication??
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    would also accept introns and exans since thats a valid point
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