Edexcel Biology A Paper 2 - 16th June 2023 [Exam Chat]

^ answer?

The treatment only affects the cells in the eye. The faulty allele is still part of the genome and is contained in the gametes. If they have a child with someone who carries the gene for it or has it, the child can have it too.

Reply 81

Anonymous744

OP

8

Original post by Sarah__xxx

The treatment only affects the cells in the eye. The faulty allele is still part of the genome and is contained in the gametes. If they have a child with someone who carries the gene for it or has it, the child can have it too.

Lol I talked about sex linked disorder

Reply 82

incrediblejpw04

Original post by Anonymous744

Lol I talked about sex linked disorder

same haha definitely wrong tho

Reply 83

starrrrlight99

10

guys that q about bipolar neurone or smth
is it inhibited or? i wrote there's more action potentials and threshold is reached i think i wrote the complete opposite..

Reply 84

Sarah__xxx

10

Original post by starrrrlight99

guys that q about bipolar neurone or smth
is it inhibited or? i wrote there's more action potentials and threshold is reached i think i wrote the complete opposite..

You were supposed to write that the rod cell is not depolarised because the sodium ion channels shut, which prevents the release of the neurotransmitter glutamate. Because the rod cell is not stimulated, the bipolar membrane is not inhibited so it depolarises. As long as you didn’t say that the rod cell depolarises you should be fine because that would be the opposite.

Reply 85

starrrrlight99

10

Original post by Sarah__xxx

You were supposed to write that the rod cell is not depolarised because the sodium ion channels shut, which prevents the release of the neurotransmitter glutamate. Because the rod cell is not stimulated, the bipolar membrane is not inhibited so it depolarises. As long as you didn’t say that the rod cell depolarises you should be fine because that would be the opposite.

ugh i wrote the opposite sodium ion channels open and more neurotransmitters released
i didn't even read the question properly bc i was running out of time.. was it 4 marks?

Reply 86

Sarah__xxx

10

Original post by starrrrlight99

ugh i wrote the opposite sodium ion channels open and more neurotransmitters released
i didn't even read the question properly bc i was running out of time.. was it 4 marks?

Yup, maybe you’ll get like 1 or 2 marks for mentioning the sodium ion channels?

Reply 87

charminggem

7

Original post by KillSwitch12

it’s topic 3 i think, due to transcription factors. The lactose binds to a respressor so the gene can be activated and transcribed by RNA polymerase on the promotor region. The enzyme b-galactosidase breaks down lactose into galactose and glucose.

shoot i wrote dna instead of rna polymerase ffs

Reply 88

charminggem

7

Original post by Bookworm524

It took me by surprise. I didn't revised for 1-4 at all and they didn't put that many topic 7,8 questions

same i didnt revise topic 1-4 and had to rely on my long term memory

Reply 89

charx134

3

Original post by Justinbieberd

Fr I was looking at the data thinking how on earth do they expect us to write about not drinking alcohol increases Chd???

im not 100% sure if this is right but, we learned that small amounts of alcohol reduce it because they contain antioxidants, which basically help get rid of free radicals that can damage arterial walls?? I remember learning about it at the beginning of year 12 so I was properly reaching

Reply 90

charminggem

7

Original post by charx134

im not 100% sure if this is right but, we learned that small amounts of alcohol reduce it because they contain antioxidants, which basically help get rid of free radicals that can damage arterial walls?? I remember learning about it at the beginning of year 12 so I was properly reaching