AQA AS Biology Paper 2 unofficial markscheme 2018 Watch

Poll: How did u find the paper?!
AMAZING :D (16)
7.66%
Great! Nailed it (25)
11.96%
Ok. (81)
38.76%
Could have been better... meh (41)
19.62%
Disaster :( (46)
22.01%
martinii
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#1
Report Thread starter 9 months ago
#1
Hello guys! Decided to make another chat here for the unofficial marsceme for today's paper! Since I couldn't find one let's start one here and add all ur answers down below )
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martinii
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#2
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#2
I remeber the letters spelling B A E. one was chloroplast and another was Golgi apparatus
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alphabet1
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#3
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How did people do working out the number of cells for undiluted x
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flosiphy
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#4
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#4
how did everyone find it? my bad guesses:

Dna 5 marker
-in E: Lineaer P: Circular
-in E: longer P: shorter
-in E: histones P: supercooled
-in E: nucleous P: cytoplasm
-both have genetic info
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flosiphy
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#5
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Chromatids 3 marker:
-chromatids not separate at centromere
-doesn't go to opposite poles
-doesn't appear v shaped
-cannot enter telophase
-disrupts cell cycle
-no root growth
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martinii
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#6
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#6
What is digestion - the hydrolysis of large insolubiable substances into smaller solvable substances that are easily absorbed into the system

Milk question- lots of mitochondria for aerobic respiration to produce ATP for protein synthesis. Lots of Golgi vesicles to package and modify the proteins

DNA eukaryotic vs prokaryotic
Eukaryotic have DNA in nucleus which is condensed and wrapped around histones whilst prokaryotic cells have loose DNA floating in the cytoplasm without any proteins attached onto. They also contain circular DNA called plasmids
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flosiphy
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Haemoglobin 5 marker (guess)
-primary structure: order of amino acids
-aminos coded by triplet
-genetic code is universal
-same triplets code for same aminos
-evidence we are from same ancestor
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miracleadda
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#8
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For the 2nd 5 marker I talked about the more similar the amino acid sequence as there would be less mutations and more similarity in the amino acid sequence showing that the species share a more recent common ancestor and had only divided recently therefore showing the closeness in evolutionary relationship. I might be wrong this is just the route of explanation in which my thinking went.
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DSmith147
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(Original post by miracleadda)
For the 2nd 5 marker I talked about the more similar the amino acid sequence as there would be less mutations and more similarity in the amino acid sequence showing that the species share a more recent common ancestor and had only divided recently therefore showing the closeness in evolutionary relationship. I might be wrong this is just the route of explanation in which my thinking went.
Yeah I wrote something similar. I talked about the fact that the amino acid sequence determines the primary structure of the protein and amino acid sequences for haemoglobin from different species can be compared to see the differences in them. The more similar the sequence the earlier they may have branched off from their common ancestor.
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ellxe
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#10
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#10
Did anyone else get a huge number (I got something X 10^9) for the bacteria in undiluted solution?
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alphabet1
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#11
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#11
I got 150 but I think it's wrong
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hollylouise2324
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#12
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#12
(Original post by ellxe)
Did anyone else get a huge number (I got something X 10^9) for the bacteria in undiluted solution?
I got 375000 I’ve gone wrong somewhere hahahahaha
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nrodrigo777
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#13
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#13
I got the same, hopefully we are right😂
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C342
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#14
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#14
(Original post by hollylouise2324)
I got 375000 I’ve gone wrong somewhere hahahahaha
hahaahaha omg I got the samee
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malbod
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#15
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#15
did anyone get 3.75 for the percentage difference question?
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alphabet1
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#16
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#16
(Original post by malbod)
did anyone get 3.75 for the percentage difference question?
Yeah x
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Infinityad00
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#17
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#17
Can this paper come up in my year 12 mocks?
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emilybbb
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#18
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#18
What did people get for the SA maths question? asking for the diameter?
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bluepotato
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#19
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#19
can someone make a full document of the unofficial markscheme like last time? thanks.
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xFredo
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#20
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#20
(Original post by bluepotato)
can someone make a full document of the unofficial markscheme like last time? thanks.
I second this ^^
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