Edexcel 6BIO1 ~ 9th January 2013 ~ AS Biology

I put that a healthy gene would need to be inserted into the sheeps DNA, it could be a dominant allele as it is a reccesive disease, by the use of a vector eg plasmid, bacteria or virus, by the use of a needle, this would incorprate into the shheps dna, it would have to be repeated as the cells would die.

What did you write for how the structure of trna is different from mrna?

I'm actually quite annoyed about that one because I thought it was asking about how to conduct an experiment to investigate this! But I wrote about reliability and checking to see the changes in fluid in the brain the worse thing is I actually knew the whole process of gene therapy! I guess that was the main problem but how did you generally find the paper?

I don't exactly remember but it was something about mRNA being shingle strand molecule

I got the solute question so wrong! for some reason I thought solutes diffuse by osmosis.. so I started talking about how solute p is diffused by osmosis from high concentration to low...etc

you might still be able to get some marks though as long as you mentioned the concentration gradient and that it reached an equilibrium and that the other molecule ( solute R ) was too large

What did you write for how the structure of trna is different from mrna?

Wait a sec....you're saying that If I get over 54 out of 80? Ill get an A? but thats just about 67%? Are you sure? I thought you needed to get over 85% to get an A?

What did you guys put for the solute p and r question?
I said that it had diffused through the cell, as diffusion is from an are of high concentration to an area of low concentration until equilibrium is reached and then for the other solute it would required facilitated diffusion (which involves a channel protein) as it's too big to enter the cell by simply diffusion.

I have no idea if any of this makes sense D:
U can put

Posted from TSR Mobile

I put that a healthy gene would need to be inserted into the sheeps DNA, it could be a dominant allele as it is a reccesive disease, by the use of a vector eg plasmid, bacteria or virus, by the use of a needle, this would incorprate into the shheps dna, it would have to be repeated as the cells would die.

You can put osmosis because its a solute, solute contains water...

YAY

Are you sure there were 6 marks. I'm almost certain it was 5. I don't remember writing ventricles.

We haven't learnt unit 2 yet.


I did a bit of both. I basically described how you'd carry it out, but I went into detail for that specific question, eg, inserting it into brain cell so injections won't be suitable.

And yeah, what did that say? I read it like why was the overall change in blood cholesterol level a risk factor and people are telling me it was what were the reasons for the overall change in blood cholesterol. What do you guys think?

And yeah, what did that say? I read it like why was the overall change in blood cholesterol level a risk factor and people are telling me it was what were the reasons for the overall change in blood cholesterol. What do you guys think?

LOL..pls can you post the question paper asap atleast? u can do the unoffic mark scheme later?

If you did this paper for the first time and are claiming it was easy just wait and watch..i did the june 2012 and thought it was easy only to miss an A by 2 marks..i got 91/120.

You can put osmosis because its a solute, solute contains water...

I wrote that the vector (virus) can be injected into the spinal cord as that gives it direct and an easy route to the brain.

Because I remembered that in one of the past papers about gene therapy on rats, they injected the vector in the spinal cord to deliver it to the brain.

I wrote about how people were more educated about the risks of CVD hence the further sharp decrease and I wrote that the health system improved.