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

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And what did anyone put on the last page about competitive inhibitors for Alzeimers because the way that question was worded really confused me

Reply 421

maddie001

Original post by Luchamb

Couldnt you just compare the sequence of bases and the amount?

This is what i did!! I wrote the number of base sequences and the sequences of bases themselves!

Reply 422

GabbytheGreek_48

Original post by funkykid295

On the HIV qs about semi- conservative replication I out DNA-HELICASE breaks hydrogen bonds separating strands. DNA-Polymerase binds RNA-polynucleotides to DNA template strand. Did anyone else out anything similar????

yeah apparently template strand was already made so you probly wont lose any marks for not talking about helicase

Reply 423

maddie001

Original post by funkykid295

And what did anyone put on the last page about competitive inhibitors for Alzeimers because the way that question was worded really confused me

I did! I wrote that the drug would be an inhibitor or b-secretase so less enzyme substrates form = less small proteins = less 'alypohid' proteins = less plaque

Reply 424

funkykid295

Original post by GabbytheGreek_48

yeah apparently template strand was already made so you probly wont lose any marks for not talking about helicase

what was your answer??

Reply 425

maddie001

Original post by liziepie

It already told you in the question it helped with diffusion, so maybe not.

I put that it may have been an enzyme because at the bottom there was an arrow pointing to a depression in the protein saying 'substrate'

Reply 426

james..michael

What was the other function of Y?

Reply 427

james..michael

Also what was the answer to question which talked about why 100 mol dm-3 should be used? I think a student said it was the best way

Reply 428

james..michael

And also what would happen if the spindle fibres were pulled to only one pole?

Reply 429

Lowry1999

I wrote something about how it only impacted 93% of the cancer cells and other rapid growing cells would be impacted by the solution so not 100% should be used

Reply 430

Lowry1999

Original post by james..michael

And also what would happen if the spindle fibres were pulled to only one pole?

sister chromatids wouldnot separate and all end up in the same cell, not producing 2 daughter cells

Reply 431

james..michael

Original post by Lowry1999

sister chromatids wouldnot separate and all end up in the same cell, not producing 2 daughter cells

Cheers bud, I think I just said 'two new cells would not be produced because the chromatids did not seperate)

What was he answer to the other function of y

Reply 432

Lowry1999

Original post by james..michael

Cheers bud, I think I just said 'two new cells would not be produced because the chromatids did not seperate)

What was he answer to the other function of y

i wasnt too sure, i thought it was a channel protein which diffuses charged particles through it, but again im not confident on that

Reply 433

SFK537

Original post by CrazyFool229

That's what I said them basically, I just didn't specifically use the word isomers. Darn it.

You probs don't have to say isomer to get the marks so you should be fine :smile:

Reply 434

Chemmi

Has anyone made a mark scheme?

Reply 435

Moniquepowellx

Original post by BamSrown

Anyone else get 10 for the rate of reaction?

Yes I got 9.something

Posted from TSR Mobile

Reply 436

Epitype

Original post by saulgreen

completely forgot they had different sugars!! I put that DNA has a double helix, thymine instead of uracile and then for the last one put that RNA contains no introns as it has been spliced. Do you think I'd get the mark for that cause its technically not wrong, but I don't think thats the kind of structural differences they were looking for

I'd say that you got two marks out of the three. Yes, I don't think they would take introns as a viable answer.

Reply 437

Epitype

Original post by Bluequen18

I didn't have a clue! I literally just explained how to plot a graph using the results!

Use the calirometer to plot the results of the intensity of the reducing sugar colour and then plot it against a calibration curve against of the concentration of the reducing sugar. Then read off of the graph to find the specified concentration of reducing sugar and the result from the calirometer.
A Calirometer is used to estimate the answer to a value without having tat specific value. You do this by drawing a graph with the values you do have and then reading off from the graph to find the value you are after.

Reply 438

lilyjacks

I got 11 for rate of reaction

Reply 439

Epitype

Original post by lilyjacks

I got 11 for rate of reaction

Sounds very close.
Did you draw a tangent to the curve and then work out the rate of reaction by doing m=y2-y1/x2-x1?
If so, then you would have got the correct answer as they will give a range of answers.