Edexcel A Level Biology A Salters Nuffield Paper 2: 9BN0 02 - 17 Jun 2022 [Exam Chat]

Original post by bels1208

What did people write for breathing rate spirometer investigation?

Two groups of people one living in high altitudes and one doesn’t
same age, gender, mass
breathing into spirometer at rest for five minutes
connect to data logger
count peaks per minute on the trace to find breathing rate
2 groups of 25 people each to calculate mean
carry out stat analysis like a t-test to check for significant differences between the two sets of data.

Reply 42

What did people write about the stem cell specialising into a red blood cell & how many marks was it?

Reply 43

Original post by bels1208

What did people write about the stem cell specialising into a red blood cell & how many marks was it?

That was a sneaky question. It was 4 marks. I just wrote about how a normal stem cell would specialise (activated genes, transcribed, translated) Then said the heamglobin will be made and that the nucleus will be removed

Reply 44

That seems impressive. I ran out of things. I also wrote exclude those with asthma as it will produce invalid results.
And talked about refreshing soda lime of spirometerx Idk

Original post by Wonkagenius

Two groups of people one living in high altitudes and one doesn’t
same age, gender, mass
breathing into spirometer at rest for five minutes
connect to data logger
count peaks per minute on the trace to find breathing rate
2 groups of 25 people each to calculate mean
carry out stat analysis like a t-test to check for significant differences between the two sets of data.

Reply 45

lily0207

6

Original post by bels1208

What did people write about the stem cell specialising into a red blood cell & how many marks was it?

i said pluripotent so can differentiate into different cells types including red blood cells
stimulus causes genes to be activated
active genes transcribed to produce mrna
mrna translated to produce proteins
proteins modify structure and adapt the function
then waffled about haemoglobin as an example

Reply 46

Original post by lily0207

do u remember anything else to do with the neutrophil question so i can try to remember haha

Not at all, i was behind on time so i just did the calculation on my calculator without typing the working. praying my answer is correct because otherwise i would lose all three marks for that

Reply 47

Original post by bels1208

That seems impressive. I ran out of things. I also wrote exclude those with asthma as it will produce invalid results.
And talked about refreshing soda lime of spirometerx Idk

NO, YOU ARE THE IMPRESSIVE ONE HERE xx
The soda lime thingy sounds smart tbh it will most definitely be a marking point in the markscheme

Reply 48

yes v sneaky. I wrote some genes are activated/ switched on or not. transcription only occurs on active genes. Translation of protein occurs whereby modification of a cell regarding structure and function occurs & cell differentiation.

Original post by Wonkagenius

That was a sneaky question. It was 4 marks. I just wrote about how a normal stem cell would specialise (activated genes, transcribed, translated) Then said the heamglobin will be made and that the nucleus will be removed

Reply 49

The acetylcholinesterase one?

Reply 50

Original post by lily0207

i said pluripotent so can differentiate into different cells types including red blood cells
stimulus causes genes to be activated
active genes transcribed to produce mrna
mrna translated to produce proteins
proteins modify structure and adapt the function
then waffled about haemoglobin as an example

Yes i wrote that except i couldnt really relate it to haem.

Reply 51

Original post by Wonkagenius

The acetylcholinesterase one?

i think i wrote less neurotransmitters released into the synaptic cleft via exocytosis.
Influx of calcium ions
less depolarisation= less na+ channels opening
less action potentionq

how many marks was that?

Reply 52

what did ppl get for the % increase question. that was the only one i attempted

Reply 53

rose_quartz

8

Original post by bels1208

i think i wrote less neurotransmitters released into the synaptic cleft via exocytosis.
Influx of calcium ions
less depolarisation= less na+ channels opening
less action potentionq

how many marks was that?

I said that too, but am I the only one that had to read the question about 5 times for it to make any sort of sense? idk was the wording super hard for not reason or was it just me

Reply 54

what did people get for the body temperature during and after exercise q?

Reply 55