AQA Biology AS New Spec - 26th May and 7th June

We did a mock in school a few weeks ago, which was one of the specimen papers that aren't disclosed to the students so I can't find the answers anywhere.

Just realised I didn't mark one of the questions properly. Please help

Q) In a eukaryotic cell, transcription results in a molecule of pre-mRNA that is modified to produce mRNA. In a prokaryotic cell transcription produces mRNA directly. Explain this difference.

I know that it's to do with the complexity of eukaryotic cells but don't know exactly what the answer should have.
Any help greatly appreciated!

After transcription in Eukaryotic cells pre-mRNA needs to be modified because it contains introns (part of the gene which don't code for a polypeptide). The introns are therefore 'spliced' (removed) out of the sequence, only leaving exons(parts of the mRNA sequence which do code for poypeptides) in the final mRNA .The entire sequence of mRNA in prokaryotes code directly for polypeptides and so do not need to be modified.

I'm not entirely sure and i'm might be missing out important points, but prokaryotic cells don't have non-coding DNA, so splicing/modifying doesn't need to occur, meaning it produces the mRNA directly. This is unlike transcription in a eukaryotic cell as these cells contain introns (non-coding parts of the DNA) within and between genes which must be edited/spliced out but cannot be spliced out immediately as the entire molecule has to be transcribed (There's no way around this) resulting in pre-mRNA. The depth it wants depends on the number of marks, but i think the basis is that prokaryotic DNA doesn't have non-coding sections, so the mRNA is directly made.

We did a mock in school a few weeks ago, which was one of the specimen papers that aren't disclosed to the students so I can't find the answers anywhere.

Just realised I didn't mark one of the questions properly. Please help

Q) In a eukaryotic cell, transcription results in a molecule of pre-mRNA that is modified to produce mRNA. In a prokaryotic cell transcription produces mRNA directly. Explain this difference.

I know that it's to do with the complexity of eukaryotic cells but don't know exactly what the answer should have.
Any help greatly appreciated!

In eukaryotes, the introns and exon are both copied into mRNA during transcription. mRNA strands containing introns and exons are pre-mRNA. In pre-mRNA splicing occurs to remove the introns which are non-coding. Whereas, in prokaryotes, mRNA is produced directly from the DNA,without splicing-splicing is not needed due to there being no introns in prokaryotic DNA.

***********************PLEASE HELP******************

WHAT TIME IS THE EXAM

aqa biology as paper 2

please reply ASAP

ive got it half 9

Edit: the value is a minus as the gradient is negative.

Predictions for tomorrow??

I have it at 13:45...