# AQA Biology B2 - Unofficial Mark Scheme

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• View Poll Results: What do you predict your score?
< 10%
3.14%
> 10%
0.42%
> 20%
1.68%
> 30%
3.35%
> 40%
4.72%
> 50%
6.50%
> 60%
14.47%
> 70%
23.58%
> 80%
28.93%
> 90%
10.38%
100%
2.83%

1. (Original post by Naco88)
↑↑↑ In the poll above, an answer like '> 30%' would mean between '30%' and '40%' ↑↑↑

Follow me and I will try and post the answers for the Chemistry and Physics exams on Wednesday and Friday.
I have received a ton of answers on Twitter (@NacoRBLX) and have added a lot more to this! Thanks to everyone who has and still is sending me answers! We have made a really good community on this post today and look out for the chemistry and physics threads on Wednesday and Friday! - Naco88This mark scheme is not official and was made purely from what we saw in the exam.

AQA B2 Higher - Unofficial Mark Scheme (Updated Regularly) (Should have the last few questions of foundation)

1. Athlete Question - UPDATED
a)
i) Anaerobic means respiration without oxygen
ii) The athlete was running for 1.5 minutes.
b) How do you know it was anaerobic respiration?
The athlete produced lactic acid
c) How does the flow of the blood help the athlete's muscles?
Removes lactic acid, build up. Causes less fatigue. Supplies oxygen.
2. Pond Weed Question
• Put the pond weed in the beaker,
• Fill the beaker with water.
• Move the light close to the pond weed,
• Count bubbles in one minute, / Measure oxygen produced
• Repeat experiment but move the light closer/further away from the pond weed each time.
• To make it a fair test, use same amount of water, use same length/volume of pond weed, time it for the same length.
Question 2 notes: The answer could be any experiment to test how the amount of light intensity affects photosynthesis. The question stated that you did not have to write about the equipment pictured and it was just an example.
(6 marks)
3. Enzymes question
Circle Cytoplasm. (1 mark)
What is an enzyme? (2 marks)
An enzyme is a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
• Muscular tissue contracts and churns food in the stomach
• Epithelial tissue covers the stomach
• Glandular tissue secretes hormones and enzymes
Rest of question is incomplete
4. Plantains in the field
To improve their investigation: Use random sampling, take more samples.
With the mean average question, people seemed to be getting either 10,100 or 160,000. Different answers I know but we are not sure which is right.

Rest of question is incomplete
5. Polydactyly Question - UPDATED
Stem cells are undifferentiated stem cells that can potentially become any cell.
Rest of question is incomplete
This question had a lot of parts to do with alleles but it was so long no one can really remember it.

I am not sure if the following answer was on the polydactyly question but here are our redicted answers:
Parents genotype: Genotype: mother: Bb father :Bb
Parents phenotype: Both have brown hair
Gametes: Mother: XY Father: XX
Offspring genotype: Brother: bb Sister: Bb
Offspring phenotype: Brother - red hair sister - brown hair

How do you know the man is heterogeneous?
He has B & b alleles.
6. Removing bacteria from milk with catalase.
• Advantages: Catalysts can be reused
• Disadvantages: Enzymes can denature, Hydrogen Peroxide doesn't kill all the bacteria, It could mix with/stay in the milk which could be harmful to humans.
These weren't the only ones but they're the ones I have seen posted the most.

Rest of question is incomplete
7. Meiosis & Mitosis
The sperm cells were produced in the testes by Meiosis. The embryo divided by Mitosis.
For the question about the size of each cell:
1. 6.6
2. 13.2
3. 6.6
4. 3.3
Rest of question is incomplete
8. Foxes
How can scientists prove the foxes originated from the same species?
The scientists could breed 2 of the foxes and see if they produce fertile offspring. (Offspring which can reproduce)
How are the foxes different species?
Foxes, Geographical isolation. Adapted differently. Mutation, So unable to breed. Different species.
Why were the foxes on the 3 islands varied but still the same species?
The islands have similar conditions so the two species adapted similarly and were so similar they could still interbreed so were still of the same species.
I am not sure what question these answers were for)

Note: The questions may not be in the right order.

This is a mix of my answers and those of the community but they are not guaranteed to be correct.

These are completely my predictions, we have decided that it was a fairly
easy paper so our boundaries are fairly high.

A* - 46 marks

A - 37 marks

B - 31 marks

C - 24 marks

Thanks for using my mark scheme : )
Thanks so much deeply appreciate it!!!!
2. (Original post by rihana.c)
I did , I put it would still contain the diseased allele but I'm not sure if its right

I put testicles instead of testes, same thing right???
i did the same thing its more than likely to be correct because testes and testicles are the same.
3. can you put the marks next to the questions please?
4. (Original post by Striker_007)
i did the same thing its more than likely to be correct because testes and testicles are the same.
yeh you're right
5. (Original post by F4RH4N_70)
For the probability question what if I wrote 1/2 instead of 50%??
That should be okay

Posted from TSR Mobile
6. (Original post by iLukeAi)
You know that question where it asked something like "why dont they use cells from the umbilical cord to treat genetic diseases?' Did anyone else put that these cells would still have the same DNA as the rest of the cells so you cant treat it?
That's exactly what I put

Posted from TSR Mobile
7. can you put the marks next to the questions please?
8. (Original post by Striker_007)
i did the same thing its more than likely to be correct because testes and testicles are the same.
cool thanks
9. (Original post by pinkcat010)
I think its 50%
I wrote 2:2=50%
Will I get a mark for that?
10. (Original post by 11masanda002)
I wrote the exact same thing for this question, would it get full marks?
Yes, it should get full marks because its correct and accurate and contains a keyword haemoglobin.
11. for the quadrats I got 20 times 0.625 which gave me 12.5 and then I did 5000 divided by 12.5 to get 400, I dnt know what I was doing..
12. (Original post by Naco88)
I think it is also spelt as testies so if you spelt it like that then yes.
Yeah I think that's how I spelt it and when you google it the same results come up
14. last question:
-geographically isolated
-different environmental conditions
-mutation causes variation
-natural selection occurs and only the best adapted survive
-old population can no longer interbreed with the new population
15. Is there a C2 thread?
16. More questions I can remember:
For the stem cells: why is it better to use stem cells from an umbilical cord instead of an embryo?
Why is it better to save a persons stem cells for use on themselves in later life?
Why can't stem cells cure genetic disorders?

Thanks for the great markscheme, let's get it up to all 60 marks of answers. I'll help for the physics and chemistry later this week.
17. (Original post by markschememate)
More questions I can remember:
For the stem cells: why is it better to use stem cells from an umbilical cord instead of an embryo?
Why is it better to save a persons stem cells for use on themselves in later life?
Why can't stem cells cure genetic disorders?

Thanks for the great markscheme, let's get it up to all 60 marks of answers. I'll help for the physics and chemistry later this week.
how many marks were these questions worth?
18. I thought the sex sigh for the female was xx and male was xy
19. For the one marker where the answer was "testes" would the examiner accept a miss spelling and allow a mark if "testes" was spelt "testies"?
20. B3 unofficial markscheme 10/06/16 ?

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