Edexcel GCSE Biology B2 - 9th of June *Unofficial Mark Scheme*

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00sevenmagic
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Place answers below

Comment what questions you can remember so we can combine to create a mark scheme

1) BLOOD CELLS
Most common blood cell or something like that Red blood cells (1)
Infection effect on blood cells More white to fight infection by producing antibodies and engulfing (3)
Less platelets will result in
Not clotting properly (1)
The point of plasma Carries substances like water and glucose (2)
2) transpiration Red dye and celery
Use lamp and change light intensity but keep co2 conc and temperature the same. Observe how dye reacts to this (not sure what it will do but I said it would decrease as it would go in to the celery showing transpiration but I think I'm wrong) (3)
3) human genome
Two advantages of human genome
something to do with scientists working together? And finding sequence of bases? (2 I think)
Graph in year 2001
2130 but I imagine there'll be a range of roughly 2100-2150 (1)
4) circulatory system
What takes blood from heart to body
Aorta (1)
Explain cardiac output graph
Cardiac output increases as x axis (I forgot what was on there) increases. Slight plateau near end?? (2/3)
Explain why the runner would get cramp when he ran really fast
Uses anaerobic respiration because he's not getting enough oxygen so lactic acid produced which causes cramp? (3)
5) protein synthesis
Transcribed to cytoplasm
-DNA double helix structure unwinds
-mRNA strand is formed
-template strand mentioned
-complimentary to DNA strand
-a with t c with g
-mRNA leaves nucleus through nucleus pore
-attaches to ribosome
-in cytoplasm (Really not sure about this one) (6)
6) DIGESTIVE SYSTEM
Compare prebiotic chemical a with b
Every food had more of a than b
(1/2 not sure)
Which food
Onion (1)
No gall bladder effect
No bile so no emulsification of fats or neutralisation so indigestion can occur
(3)
Multiple choice something
Oligosacharrides (1)
Effects of yogurt
Have one person eat yogurt and one person not for a period such as two weeks. Measure health things like cholesterol before and after and see difference (Not really sure about answer for this) (3)
Small intestine adaptations
-villi are folded so they have an increased surface area
-villi have micro villi so more diffusion can happen
-villi have thin walls so diffusion is easier
-good network of capillaries
(explain these a bit) (6)

Other questions
Cells doubling every day how long till 80
3 days (2)

Similarity of embryonic and adult stem cells
Can differentiate into different cells
(1)
Difference of embryonic and adult
Embryonic can be rejected
(1)



Looking at past B2 papers grade boundaries will probably be around:
A* - 49
A - 43
B - 34
C - 25
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Fernbank2016
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What did everyone put for the 1st 6 marker about transcription?
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MIKESPIKE10
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(Original post by Fernbank2016)
What did everyone put for the 1st 6 marker about transcription?
There wasn't much to talk about really
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m._x__
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(Original post by Fernbank2016)
What did everyone put for the 1st 6 marker about transcription?
I bloody talked about genetic engineering ;((
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Taran001
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(Original post by Fernbank2016)
What did everyone put for the 1st 6 marker about transcription?
I talked about translation
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dankirk180
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What did everyone put for the table on the Human Genome project?
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fiza.ahmed_
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(Original post by dankirk180)
what did everyone put for the table on the human genome project?
2210 ? I think
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fiza.ahmed_
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(Original post by Taran001)
I explained identification of genes if there was a faulty allele and i also put gene therapy so you can prepare for the effects
i put that too !
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Taran001
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(Original post by fiza.ahmed_)
2210 ? I think
It was between 2200 and 2400 i think
So i put 2330 or something like that
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coldwarm34
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(Original post by fiza.ahmed_)
2210 ? I think
Crap, looks like I missed a question, was it one mark ?
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Taran001
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What do you guys think i could get on the 1st six marker for only talking about translation as well as saying something about genes and characteristics??
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Joemartin420
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what did everyone put for the effects of having your gallbladder removed?
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Hdawg67
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What did everyone put for the question on probiotic yoghurt on how to test if it makes a person healthy or something?
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Taran001
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(Original post by 00sevenmagic)
Place answers below, so can compile a mark scheme, thanks

+ how did u think the exam went
found it quite good, the 6 markers were great
1 question on mineral salts enter plants or something
Answer was active transport from a low to high conc against conc gradient using energy
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Taran001
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(Original post by Joemartin420)
what did everyone put for the effects of having your gallbladder removed?
Bile cannot be stored
So person will not be able to emulsify facts and pH will not be neutralised
So less molecules will be broken down
Then i said it can lead to constipation
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Taran001
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(Original post by 00sevenmagic)
Place answers below, so can compile a mark scheme, thanks

+ how did u think the exam went
found it quite good, the 6 markers were great

Looking at past B2 papers grade boundaries will probably be around

A* - 49
A - 43
B - 34
c- 25

ect
I'd take them grade boundaries! I thought it was slightly harder than last years
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00sevenmagic
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(Original post by Taran001)
What do you guys think i could get on the 1st six marker for only talking about translation as well as saying something about genes and characteristics??
The whole question is about transcription, translation is after it has entered the cytoplasm
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Hcst
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(Original post by Taran001)
What do you guys think i could get on the 1st six marker for only talking about translation as well as saying something about genes and characteristics??
I wrote about translation as well and the gene , a t c g and hydrogen bonds
The ideas was messy hope i will get 5 or 4
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Taran001
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(Original post by 00sevenmagic)
The whole question is about transcription, translation is after it has entered the cytoplasm
I'm gonna need to do well in C2 and P2 now to make up for this
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Hcst
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(Original post by Taran001)
Bile cannot be stored
So person will not be able to emulsify facts and pH will not be neutralised
So less molecules will be broken down
Then i said it can lead to constipation
I wrote the same but without mentioning that bile not stored
I think i wrote smt wrong like bile not produce 😭
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