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

Collagen? It’s fibrin that forms the mesh isn’t it? Or am I remembering wrong?

Yes but when an artery is damaged the platelets come into contact with the collagen to form a platelet plug. Then later on in the process thrombin turns fibrinogen to fibrin. - forming a mesh net causing the clot.

Reply 61

Tomiboi15

7

Original post by KillSwitch12

Think it was to do with reacting with collagen more slowly - therefore taking longer to form a platelet plug. Slower release of Thromboplastin etc.. Takes longer for clot to form.

I wrote more thromboplastin is released??

Reply 62

Sarah__xxx

10

Original post by KillSwitch12

Yes but when an artery is damaged the platelets come into contact with the collagen to form a platelet plug. Then later on in the process thrombin turns fibrinogen to fibrin. - forming a mesh net causing the clot.

Ahhh alright yes. I wrote about that thankfully

Reply 63

Sarah__xxx

10

Original post by Tomiboi15

I wrote more thromboplastin is released??

Don’t worry. I don’t think you had to write about that. It was more about there not being enough platelets to get caught in the mesh so a clot takes a long time to form

Reply 64

username6111637

10

Poll about the exam on diff. TSR thread

https://www.thestudentroom.co.uk/showthread.php?t=7364953

Reply 65

rkapoor

1

Original post by incrediblejpw04

surely though if she was RR the all other offspring would have the disease.
would be 10 because all the black boxes could only ever be Rr

Im pretty sure it was 9 because they only had one kid which was a black box so it could've been Rr or RR

(edited 10 months ago)

Reply 66

Anonymous744

OP

8

For the genetic modification virus question - the answer to the MCQ of how many statements were right - it was none?

Reply 67

username6111637

10

what was the question?

Reply 68

Anonymous744

OP

8

Original post by Uniiiiiiii

what was the question?

Ligase enzymes
Restriction enzymes one
It asked how many statements were correct?

Reply 69

username6111637

10

yh i think it was none were correct

Reply 70

Bookworm524

19

lol there're like 3 different threads for this paper on here. I'm getting slightly confused :awesome:

Reply 71

s.m.y

2

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.