17th May 2016- OCR 21st Century Science B1 B2 B3 Exam

I put 87/100 for the 87% chance one, which is still a probability. I thought the questions were mostly ethics, IaS and general thinking rather than proper science, which didn't suit me. Still, could be worse, could be AQA...

Reply 341

niamhdoesmaths

21

What did everyone put for the question that asked about why it's important to carry out long-term human trials? It was on the specification and annoyingly I couldn't find anything online to explain it so I have a feeling that's one place I will have thrown away some marks. I put:
1- Because it takes a long time for a drug to be considered safe so they should be long-term to ensure that all risks are taken care of
2- Because no drug is ever risk free as individuals will always react to them, so the extent of these side effects need to be known before the drug is considered safe and this requires a lot of testing and time.

I honestly had no idea so I just guessed - probably wrong.

Reply 342

yusrad123

what was the answer to this 6 marker

Reply 343

MezmorisedPotato

OP

18

Original post by NiamhM1801

What did everyone put for the question that asked about why it's important to carry out long-term human trials? It was on the specification and annoyingly I couldn't find anything online to explain it so I have a feeling that's one place I will have thrown away some marks. I put:
1- Because it takes a long time for a drug to be considered safe so they should be long-term to ensure that all risks are taken care of
2- Because no drug is ever risk free as individuals will always react to them, so the extent of these side effects need to be known before the drug is considered safe and this requires a lot of testing and time.

I honestly had no idea so I just guessed - probably wrong.

To test long term effectiveness and test safety over long term is what I put. :smile:

Because time can affect drug effectiveness and impact on the body eg chemotherapy

(edited 7 years ago)

Reply 344

username1454260

17

Original post by MezmorisedPotato

To test long term effectiveness and test safety over long term is what I put. :smile:

Because time can affect drug effectiveness and impact on the body eg chemotherapy

Same, I put side effects and to see if the drug becomes less effective. Just to let everyone know I made a thread for chemistry so we can do the same thing :wink:

http://www.thestudentroom.co.uk/showthread.php?t=4094377

Reply 345

MezmorisedPotato

OP

18

Original post by Ella_08

Actually I was thinking that too. Although NS can lead to survival it can also go the reverse and the species with less advantageous genes can't compete and die - just as you said. But tbh our points are definitely correct about extinction so I think the mark scheme should be relatively flexible. It better be fair!!! :hmmmm2:

Thing is natural selection only work on features which are of benefit to the organism so featurea which do not help survival will not be passed on.

Reply 346

niamhdoesmaths

21

I made the physics thread a while ago if you want to check it out, I know the first exam for it isn't until next week but still...
http://www.thestudentroom.co.uk/showthread.php?t=4067103&p=64885023#post64885023

Reply 347

louisemayorx

3

Original post by MezmorisedPotato

Thing is natural selection only work on features which are of benefit to the organism so featurea which do not help survival will not be passed on.

oh god i only wrote about natural selection, i'm terrified there will be no marks for it

Reply 348

MezmorisedPotato

OP

18

Original post by louisemayorx

oh god i only wrote about natural selection, i'm terrified there will be no marks for it

Look, I'm sure you will pick up some marks for it as long as you've explained it well. I guess it is about how people interpret the question. :smile:

Why I hate six markers. They are sometimes too vague.

Reply 349

AlexFagg

2

Get an unofficial mark scheme going

Reply 350

BULL14

16

For the Ebola question I mentioned how it had not gone through a clinical trial, since the lady was the first person to be tested on. Therefore the long-term side effects were unknown. Do you guys think that will get me a mark.

The last question about two species being similar, so they are newly formed. I mentioned the fact they are young they haven't had many mutation that could be passed through by natural selection - which takes time. Is that rightish?

What did you guys write about jane mother having the allele for the genetic diagram?

I though it was a very difficult paper.

An unoffical mark scheme would be appreciated :smile:

Reply 351

70lewisjones

Unofficial mark scheme please?

Reply 352

BULL14

16

For the Ebola question I mentioned how it had not gone through a clinical trial, since the lady was the first person to be tested on. Therefore the long-term side effects were unknown. Do you guys think that will get me a mark.

The last question about two species being similar, so they are newly formed. I mentioned the fact they are young they haven't had many mutation that could be passed through by natural selection - which takes time. Is that rightish?

What did you guys write about jane mother having the allele for the genetic diagram?