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Edexcel A-level Biology A (Salters-Nuffield) Paper 3 - 18th June 2025 [Exam Chat]

Reply 80

Alex_w24

1

Original post

by priestly-cashier

For the 9 marker would DNA and RNA count as things to talk about for complementary shapes

I WROTE ABT THAT TOO. I also talked about enzymes

Reply 81

cheska15

9

Original post

by user3764729

they couldn't have been nicer w the 9 marker!!! some article q were a bit eh but they were like 2 marks and i didnt like the trinucleotide data table q but apart from that was solid

i was acc so happy that the 9 marker didnt include any data otherwise i’m done for😭

Reply 82

bundlesofbuttons

9

Did anyone else say that urea contained a (NH2) group, so the nitrogen could be conserved to produce nucleotides/ amino acids?

Reply 83

emmalee25

9

i thought the 9 marker was a blessing but i put complementary base pairing, enzymes but i also put proteins/receptors. not sure if enzymes come under protein aswell but yeah 😭😭 the pre release questions were disgusting

Reply 84

emmalee25

9

Original post

by bundlesofbuttons

Did anyone else say that urea contained a (NH2) group, so the nitrogen could be conserved to produce nucleotides/ amino acids?

yes 😊 it really stumped me at first though

Reply 85

Dojacat 18

6

Original post

by emmalee25

i thought the 9 marker was a blessing but i put complementary base pairing, enzymes but i also put proteins/receptors. not sure if enzymes come under protein aswell but yeah 😭😭 the pre release questions were disgusting

agreed agreed agreed

Reply 86

emmalee25

9

Original post

by lavish-drumstick

What did y’all put for the questions of showing the mean of taps between 50 and 60 was 45?

i kind of cheated and worked backwards then just made the mean (percentages added up) / 11 = 30% =0.3 , 0.3 x 150 =45

Reply 87

Dojacat 18

6

Original post

by emmalee25

i kind of cheated and worked backwards then just made the mean (percentages added up) / 11 = 30% =0.3 , 0.3 x 150 =45

samee omg that gen was the only way i could do it

Reply 88

Olivertwist0018

6

Original post

by emmalee25

i kind of cheated and worked backwards then just made the mean (percentages added up) / 11 = 30% =0.3 , 0.3 x 150 =45

Lool same. But bcs it said around 45% I said between 50 and 60 there mean is around 29% so 29% of 150 was 44.25 which is basically 45% hope it works 💀

Reply 89

Olivertwist0018

6

Original post

by Dojacat 18

agreed agreed agreed

I Was going to but then I didn’t talk about complementary base pairing cuz it said complementary molecules so I spoke about enzymes, MHC and CD4 receptors and for this one idk but I said neurotransmitters and receptors on the post synapses allows for depolarization and action potential to be generated 🙏

Reply 90

Olivertwist0018

6

I feel like grade boundaries are gonna be high cuz no brain or HIV or TB or any tricky stuff rlly came up. It was more AS but in harder contexts if that makes sense idk anyone agree🙏 but I PRAY that they aren’t very high

Reply 91

Olivertwist0018

6

Original post

by user3764729

they couldn't have been nicer w the 9 marker!!! some article q were a bit eh but they were like 2 marks and i didnt like the trinucleotide data table q but apart from that was solid

For the RNA tri and di nucleotide I said that the trinucleotide shows that the genetics code is degenerate cuz 2 of them coded for lysine but the other didn’t. And that di nucleotide it didn’t code for anything cuz it didn’t have a triple idk if it’s right pls someone lmk🙏

Reply 92

s.m1

8

Original post

by Asdf23

Yh fr it’s actually annoying, and also is adenosine an inhibitory neurotransmitter, so it acts similar to the way glutamate acts in the eye

for this question what did you say? this one confused me

Reply 93

chubby-savior

5

Original post

by 456001

Icl I found it a little hard. What 3 molecules did you write about?

Myosin, enzymes and tRNA

Reply 94

s.m1

8

Original post

by Olivertwist0018

I Was going to but then I didn’t talk about complementary base pairing cuz it said complementary molecules so I spoke about enzymes, MHC and CD4 receptors and for this one idk but I said neurotransmitters and receptors on the post synapses allows for depolarization and action potential to be generated 🙏

i said the same thing lol

Reply 95

s.m1

8

Original post

by Olivertwist0018

I feel like grade boundaries are gonna be high cuz no brain or HIV or TB or any tricky stuff rlly came up. It was more AS but in harder contexts if that makes sense idk anyone agree🙏 but I PRAY that they aren’t very high