x Turn on thread page Beta

# OCR 21st Century Science B4 B5 B6 10th June 2016 watch

1. (Original post by rkp123)
Apparently some people got 1:639 / 1/639 but I don't get how and apparently that's the answer ??
It was 1:639, because for every 1 diseased person you have 639 healthy people, as there are a total of 640,000 people, of which 100,000 are diseased, so simplify the numbers and you get 1/640, but since it's a ratio you're not saying "1 diseased person out of 640 healthy people", you're saying "1 diseased person for every 639 healthy people".
It was 1:639, because for every 1 diseased person you have 639 healthy people, as there are a total of 640,000 people, of which 100,000 are diseased, so simplify the numbers and you get 1/640, but since it's a ratio you're not saying "1 diseased person out of 640 healthy people", you're saying "1 diseased person for every 639 healthy people".
couldn't you technically say both though?
You could say it affects 1 person every 640 (out of 640 people it will affect 1 person) people but also 1 person for every 639 other people

edit:
nvm I get it now because you had to put it in a ratio **** lol
3. (Original post by 47Frenzy)
couldn't you technically say both though?
You could say it affects 1 person every 640 (out of 640 people it will affect 1 person) people but also 1 person for every 639 other people

edit:
nvm I get it now because you had to put it in a ratio **** lol
Surely though you could put 1/640, I've seen on previous mark schemes that you can put a fraction for a question asking about ratio.
4. Does anyone have a copy of the paper?
5. 6 Mark Questions (FOR DECEMBER MOCKS 2016 GCSE)
B4: Limiting factors to Photosynthesis
B5: The Cell Cycle
B6: Mylene Sheath - Comparing someone who's is damaged (multiple sclerosis) and a normal one
6. (Original post by MmathewOc)
6 Mark Questions (FOR DECEMBER MOCKS 2016 GCSE)
B4: Limiting factors to Photosynthesis
B5: The Cell Cycle
B6: Mylene Sheath - Comparing someone who's is damaged (multiple sclerosis) and a normal one
don't think it will be the same paper for mocks because of the new igcses w new specifications, papers and stuff
7. (Original post by eviemason)
Surely though you could put 1/640, I've seen on previous mark schemes that you can put a fraction for a question asking about ratio.
Yeah that's what I put because that's what they say like '1 in every 640' it sort of makes sense because it means that 639/640 are unaffected and 1/640 is
8. unoffical mark scheme pleaaaaseeeeee???!!!!!!
9. (Original post by Aishoolimoo)
I said stage B
I said that stage A was meiosis to create gametes then stage C was mitosis cos it showed a tadpole with an arrow pointing to a grown frog so I was thinking mitosis is used to growth. I thought stage B was just fertilisation cos it was just a fertilised egg... I could be wrong
11. I put Amy as the reflex modify...thing...question.
Any one else?
Or am I completely wrong.
12. (Original post by tereziscool)
I put Amy as the reflex modify...thing...question.
Any one else?
Or am I completely wrong.
I put Amy too
13. Guys !! I talked about enzymes at different temperature and pH levels in the B4 6 mark question, is this right or was I expected to write about photosynthesis ?
14. No I wrote about the ph and temperature as well and how they can change the active site of an enzyme
15. (Original post by 123 123)
Guys !! I talked about enzymes at different temperature and pH levels in the B4 6 mark question, is this right or was I expected to write about photosynthesis ?

Posted from TSR Mobile
16. (Original post by shlokz12)
I put Amy too
Same!
17. (Original post by nikjaxon)
unoffical mark scheme pleaaaaseeeeee???!!!!!!
If feel exactly the same!
18. (Original post by Char4ncubex)
I said that stage A was meiosis to create gametes then stage C was mitosis cos it showed a tadpole with an arrow pointing to a grown frog so I was thinking mitosis is used to growth. I thought stage B was just fertilisation cos it was just a fertilised egg... I could be wrong
You're right.
19. Has any1 got an unofficial mark scheme please? TY!
20. (Original post by NiamhM1801)
My friend put something along those lines. I'm pretty sure I misinterpreted the question - I thought it meant AFTER the methanol had already been broken down so I had no idea how ethanol would cure that. I might have got 2 marks for writing that they both have similar shapes (1) so they both fit into the active site (1). Might be being a bit ambitious there though haha
Sounds like you should get some marks from that. It was an unusual question

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 1, 2017
Today on TSR

### I've studied the wrong subject

...Should I go back to school?

### Should I complain about my supervisor?

Poll
Useful resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE