# OCR Biology A Exam Thread (Breadth - May 26, 2016 and Depth - June 7, 2016) watch

1. (Original post by DaVinciGirl)
What did you guys suggest what other problem the honey bee has?

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I wrote something like the thing that had bitten it could be a be a vector and pass a disease. I had no idea
2. Am I the only one with 1 as the degrees of freedom value?
I did 2 categories as there was 2 tissues... So 2-1=1.
But everyone else got 3 and used 4 categories as in prophase, metaphase, anaphase and telophase?So 4-1=3

Hmm.
3. what did people put for why the student t test wasn't suitable? I had no clue
4. (Original post by Ozil5)
I wrote something like the thing that had bitten it could be a be a vector and pass a disease. I had no idea
I put this
5. (Original post by Ozil5)
I wrote something like the thing that had bitten it could be a be a vector and pass a disease. I had no idea
I said it could excrete aka do a **** in it which contains pathogens which could cause infection woops
6. (Original post by sdeponte)
what did people put for why the student t test wasn't suitable? I had no clue
I said there was 4 variables and t test is only suitable for 2 but that was a guess lol
7. (Original post by ronnydandam)
it wasn't that easy - you may think you've got the questions right but OCR are very pinickity on wording in their mark schemes and the ambiguity of the questions will lead to a lot of marks lost
Ok
8. (Original post by kaykaayy)
Am I the only one with 1 as the degrees of freedom value?
I did 2 categories as there was 2 tissues... So 2-1=1.
But everyone else got 3 and used 4 categories as in prophase, metaphase, anaphase and telophase?So 4-1=3

Hmm.
Unfortunately every phi test has an expected value and a real value - the two tissues were the expected and real values. If it was 2, every phi test would have 1 as their degree of freedom. That's why it's 3 and not 1.
9. For the Chi Squared x^2 was like 13.835 or something. Freedom was 4 - 1 = 3. And the results were significant because the calculated value was greater than the observed value.
10. (Original post by Ozil5)
I wrote something like the thing that had bitten it could be a be a vector and pass a disease. I had no idea
seems legit. I wrote something about the bee having difficulty to breathe .-. yes, it's wrong.
11. (Original post by Desouza123)
For the Chi Squared x^2 was like 13.835 or something. Freedom was 4 - 1 = 3. And the results were significant because the calculated value was greater than the observed value.
Yeah I wrote the same

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12. (Original post by habibtii)
seems legit. I wrote something about the bee having difficulty to breathe .-. yes, it's wrong.
I wrote the same thing as you lol
Not sure if it's correct now :/

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13. (Original post by kaykaayy)
Am I the only one with 1 as the degrees of freedom value?
I did 2 categories as there was 2 tissues... So 2-1=1.
But everyone else got 3 and used 4 categories as in prophase, metaphase, anaphase and telophase?So 4-1=3

Hmm.
Yeah, that's an honest mistake but in the question it said to use how many rows
14. (Original post by habibtii)
seems legit. I wrote something about the bee having difficulty to breathe .-. yes, it's wrong.
I wrote that as well :.(
15. What did you guys get for how to improve the enzyme experiment about Lipase?
I put use a thermostatically controlled water bath so temp does not fluctuate
I also said test more temperatures between 30-35 because it was the optimum?
Lol I have no idea
16. What would a C be? At this rate, that seems to be as high as I'm going to get 😔
17. (Original post by DaVinciGirl)
I wrote the same thing as you lol
Not sure if it's correct now :/

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I said the same 😬
18. (Original post by habibtii)
seems legit. I wrote something about the bee having difficulty to breathe .-. yes, it's wrong.
I put something similar - tidal volume would be decreased.
I didn't explain why so I'm probably not going to get the mark either way but oh well
19. What did you guys get for the role of chitin. I put used as a cell wall for rigidity lol
20. (Original post by asinghj)
I wrote that as well :.(
I think you could get a mark - I put that the mites block the airways and therefore the bee has reduced airflow, and won't be able to breathe as efficiently.

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