Edexcel A2 Biology SNAB 6BI04 ~ 6BIO5 June 2016

Does anyone know how you get an A* overall? Do you need to get an A* in each A2 module?

No it's biology. I learnt it at GCSE. There's reference to it in the scientific article.

a lot of people fell into this trap and got dragged into talking about splicing but the key point was that the genes were different lengths and would therefore have different amino acids primary sequences, giving rise to different proteins

You may pick up some marks for Golgi, as long as you talked about its role in protein synthesis. I hedged my bets and talked about roles of rER AND Golgi, just in case I had put the wrong answer for the labelling question!! As the image was so unclear, marking scheme may allow descriptions of both

I think that it was just one gene in fruit flies and the question, how one gene could give rise to more than one protein.

The answer is splicing, splicing does give rise to different lengths as it can also remove exons, rarely. Also i think you could mention about how a mistake can be made while translating the post mRNA.

Yeah it wasn't, this guy is just a **** tbh.

Here's the mark scheme for the question:

reference to transcription;
reference to {post-transcriptional modification/splicing} of (pre-) mRNA ;
reference to spliceosomes;
reference to removal of introns;
idea that axons rearranged in different combinations;
idea that the (m)RNAs are different;
reference to translation;
idea of different {primary structure/sequence of amino acids};
idea that this results in different bonds;

I get what you mean, I knew it was synoptic and I tried to go over as much AS as possible but the argument is not that it had AS content, the argument is that almost every question was based entirely on AS knowledge instead of A2 knowledge - one 3 marker on how b cells are activated hardly tests our knowledge about the entire immune system topic so how can this paper adaquately show how well we knew unit 4 when it was essentially a unit 2 exam

Do you guys attempt Q7 when doing past papers for unit 5 or just leave it out and concentrate on this years pre release ?

Here's the mark scheme for the question:

reference to transcription;
reference to {post-transcriptional modification/splicing} of (pre-) mRNA ;
reference to spliceosomes;
reference to removal of introns;
idea that axons rearranged in different combinations;
idea that the (m)RNAs are different;
reference to translation;
idea of different {primary structure/sequence of amino acids};
idea that this results in different bonds;

Why cant synthetically altered organisms compete with regular petroleum products? (paragraph 43)

suck your mum - I just used my head and initiative. Maybe you should try next time x