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

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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Reply 362

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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Reply 363

10moxoma

1

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?

Reply 364

GabbytheGreek_48

11

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

Reply 365

10moxoma

1

Original post by GabbytheGreek_48

yes i think it does

for which one?

Reply 366

10moxoma

1

what did people put for the role of protein y?

Reply 367

GabbytheGreek_48

11

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

Reply 368

GabbytheGreek_48

11

Original post by 10moxoma

for which one?

rna one sorry not sure bout the other one though

Reply 369

yourawfulness

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

Reply 370

liziepie

7

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.

Reply 371

Splaffie

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

(edited 7 years ago)

Reply 372

cxxk

6

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?

Reply 373

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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Reply 374

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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Reply 375

Splaffie

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

(edited 7 years ago)

Reply 376

Splaffie

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

Reply 377

marcobruni98

13

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

Reply 378

Luchamb