OFFICIAL OCR A2 Biology - F214 Thread

I know, as it said in big letters using ONLY the data in Fig 2.1

So, whats the grade boundary gonna be?

Is urine instead of urea okay for something that is excreted? =S

That's why the colour of the indicator becomes orange-yellow, as more respiration is taking place so more CO2 is produced which dissolves in solution to form carbonic acid which is acidic.

I agree ! Sick of pompous know-it-alls

Don't get ahead of yourself there. I don't see any other guys declaring their love for you in marriage. Now, where shall we consummate?

fore the resp. equation. I said that there are many stages in resp. And also, water is explicitly made in respiration. Is this correct? :

CO2 dissolves in water to form an acidic solution, not hydrogen carbonate.

CO2 dissolves in water to form an acidic solution, not hydrogen carbonate.

CO2 dissolves in water to form an acidic solution, not hydrogen carbonate.

That's why the colour of the indicator becomes orange-yellow, as more respiration is taking place so more CO2 is produced which dissolves in solution to form carbonic acid which is acidic.

ok the question where it asks you why the color of ph is yellow
i wrote the disc were photosynthesising, which means non-cyclic phosphorylation took place which produces hydrogen ions
which raised the ph to yellow.

i wrote that that it is clear in the table that myelinated produce faster speed of conduction. For example, when the diameter is increased from 4micrometer to 10micrometer the speed of conduction increases by 5m/s

for the next question i said the diameter of a neurone has no effect on the speed of conduction. For example for the non-meyinated neurone with 1000micrometer diamter the speed of conduction was just ....can't remember but i said something like that

I put hormones - no idea if it was right, first thing that came into my head tbh..

Correct. But I didn't put that because I read the colour wrong