Levi_Strauss
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Discuss the 21st May edexcel WBI01 AS biology paper here

The questions that came: (the ones I can remember)
>there was one about mononucleotides
>membrane-temperature permeability
>how rna aids protein synthesis
>how being obese and having high LDL levels leads to cvd
>how starch makes a good storage molecule
>one graph explanation, kinda hard because there was no clear trend
> when there’s a whole in the septum separating the atria, how does it affect o2 concentration in blood
>changes that occur in the heart after ventricular systole
>disaccharides mcq
>how a mutation (change in one amino acid) changes prothrombin and how this affects clotting
>how a change in one amino acid may not result in a change in prothrombin (this one was hard but only for two marks)
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Levi_Strauss
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What was the mRNA strand for the ‘how RNA is involved in protein synthesis question’? It had only 2 codons right?
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applesandalevels
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hey jw would you be able to pm the topics taht came up please? would be happy to answer any questions youve got about the paper im doing a2 biology snab
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Levi_Strauss
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(Original post by applesandalevels)
hey jw would you be able to pm the topics taht came up please? would be happy to answer any questions youve got about the paper im doing a2 biology snab
There was one DNA strand with 2 codons and 2 extra bases at the end so only 2 amino acids result, right?
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LightningLorenzo
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Depends if there is a stop codon at the end.
(Original post by Levi_Strauss)
There was one DNA strand with 2 codons and 2 extra bases at the end so only 2 amino acids result, right?
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applesandalevels
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(Original post by Levi_Strauss)
There was one DNA strand with 2 codons and 2 extra bases at the end so only 2 amino acids result, right?
didn't see someone put the topics ahha but ye there would be only 2, 8 bases in total, 3 needed for a codon/anticodon so youre right!
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Levi_Strauss
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(Original post by applesandalevels)
didn't see someone put the topics ahha but ye there would be only 2, 8 bases in total, 3 needed for a codon/anticodon so youre right!
Oooh good
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Levi_Strauss
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(Original post by LightningLorenzo)
Depends if there is a stop codon at the end.
On no...... but shouldn’t any codon consist of only 3 bases?! 🤯
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applesandalevels
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(Original post by Levi_Strauss)
On no...... but shouldn’t any codon consist of only 3 bases?! 🤯
im pretty sure its 3 ??, start and stop codons are also 3??
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Levi_Strauss
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(Original post by applesandalevels)
im pretty sure its 3 ??, start and stop codons are also 3??
There were only 8 bases so only two amino acids
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applesandalevels
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(Original post by Levi_Strauss)
There were only 8 bases so only two amino acids
yep! was replying to the other point sorry haha
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LightningLorenzo
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(Original post by Levi_Strauss)
On no...... but shouldn’t any codon consist of only 3 bases?! 🤯
I think for your AS spec you put a fine answer were bases code in 3's therefore only 2 codons would be produced. But usually the end of a polypeptide chain is at a stop codon so the tRNA knows when to stop translating the molecule.
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Levi_Strauss
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(Original post by LightningLorenzo)
I think for your AS spec you put a fine answer were bases code in 3's therefore only 2 codons would be produced. But usually the end of a polypeptide chain is at a stop codon so the tRNA knows when to stop translating the molecule.
Had a nightmare about scoring low marks because this is the last paper for the old spec 😅
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ibibat
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I know this is a fairly old thread but do you guys remember what came up in paper 2?
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Mehz_19
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Was AS biology (old syllabus ) WBI0 harder than (new syllabus ) WBI11 ?
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Mehz_19
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And also checking the markscheme of question paper from old syllabus of biology , most of the answers didn't match with the mark scheme of (new syllabus ) so I didn't get a lot of marks .
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