OCR A A-Level Biology Unified Biology [21st June 2023] Exam Chat

K_2004sNerd

OCR A A-Level Biology Unified Biology | 21st June 2023 [Exam Chat]

Welcome to the exam discussion thread for this exam. Introduce yourself! Let others know what you're aiming for in your exams, what you are struggling with in your revision or anything else.

Wishing you all the best of luck.

General Information
Date/Time: 21st June 2023 AM
Length: 1h30m

Link to Study Group:
A-Level Biology Study Group 2022-2023

How is everyone revising for this paper? other than flashcards and Past paper Qs?

Reply 61

smellyfeet112233

10

realised i misread so many qs in p2. described graphs instead of explaining etc... :/

Reply 62

Teribblestudent

14

Original post by smellyfeet112233

realised i misread so many qs in p2. described graphs instead of explaining etc... :/

I made some really stupid mistakes too

Reply 63

idk222222222

3

does anyone remember the questions from paper 1 or at least the topics ?

Reply 64

idk222222222

3

Original post by DS13990609

Expecting a link between DNA (module 2) and PCR (module 6)
Maybe Stem cells (module 2) to diabetes treatment (module 5)
Respiration and Photosynthesis
Haven't seen much about ECGs or those P, Q, R S wave diagrams - maybe link that to heart rate practical or adrenaline fight or flight response idk

I'll prepare some topics later, but this is all I can think of

i dont think its going to be about the heart because we already had some questions about it

Reply 65

Giraffe001

3

Original post by idk222222222

does anyone remember the questions from paper 1 or at least the topics ?

Heart circulation in left side, label Kidney structure, plant transport and hormones, a bit on synapse, also i think haemoglobin? sorry thats all i remember (nothing on respiration or human responses)

Reply 66

idk222222222

3

Original post by Giraffe001

Heart circulation in left side, label Kidney structure, plant transport and hormones, a bit on synapse, also i think haemoglobin? sorry thats all i remember (nothing on respiration or human responses)

thank you that's all i needed

Reply 67

idk222222222

3

topics that didn't show up in papers 1 and 2
-cell structure
-biological molecules (there was only experiments)
-nucleotides
-biological membranes
-exchange and transport
-classification and evolution
-animal responses
-PHOTOSYNTHESIS
-RESPIRATION
-cellular control
-pattern inheritance
-evolution
-manipulating genomes

(edited 10 months ago)

Reply 68

dyingggg

10

saw a question about levels of TP and RuBP, and that of TP is higher in the dark than in light while that of RuBP was lower in the dark than when there's light, could anyone please explain why? thank you !!

Reply 69

idk222222222

3

Original post by dyingggg

saw a question about levels of TP and RuBP, and that of TP is higher in the dark than in light while that of RuBP was lower in the dark than when there's light, could anyone please explain why? thank you !!

do you have the whole question

Reply 70

dyingggg

10

Here, I know how to calculate it but was stuck on why the levels are like that

Melvin Calvin studied the light-independent reaction (Calvin cycle) in plant cells.

He used radiolabelled 14CO2 to measure the production of organic molecules in chloroplasts.

• He placed an aquatic plant in water.

• The plant was given light for 20 minutes.

• The light was then turned off (dark conditions) for a further 30 seconds.

He measured the radioactivity of the solutions produced and used these values to calculate the number of

molecules of triose phosphate (TP) and ribulose bisphosphate (RuBP) present. The results are shown in the table below.

Activity of 14C (x10^27 Bq)

After 20 minutes light / 30 seconds dark conditions

Molecule:

TP 5.5 ; 10.1

RuBP 4.9 ; 0.6

Assuming 8.5 × 10^18 Bq are generated by each 14C atom in the molecule, how many new TP molecules are

produced after 30 seconds in the dark

A 6.47 × 10^8

B 1.80 × 10^8

C 1.83 × 10^27

D 3.37 × 10^27

Original post by idk222222222

do you have the whole question

Reply 71

sal_

5

Original post by Exodium619404

Some teachers mentioned that topics appeared in paper 1 and paper 2 will come up too as it’s unified. Usually this paper is about interlinked topics and full of weird questions…also I’m worried about the time as it’s shorter but still 2 6markers? Is that correct?

I am not sure about the topics from 1 and 2 coming up in 3. However, with timing the paper 3 is shorter however it is also less marks as 1 and 2 are 100 marks each but 3 is 70 marks. So I wouldn't worry about that toooo much.

Paper 3 is a weird one to revise for, what I've found works for me is just past paper EQ and if there is anything I don't remember content wise I go back and review that topic.

Reply 72

Exodium619404

11

Original post by sal_

I am not sure about the topics from 1 and 2 coming up in 3. However, with timing the paper 3 is shorter however it is also less marks as 1 and 2 are 100 marks each but 3 is 70 marks. So I wouldn't worry about that toooo much.

Paper 3 is a weird one to revise for, what I've found works for me is just past paper EQ and if there is anything I don't remember content wise I go back and review that topic.

Sounds like a good plan! I’m now gonna split my brain into three parts for chem bio and maths…just gonna try my best atm!!! GUYS WE CAN DO THIS!!! 6DAYS TO GO AND IM DONE

Reply 73

sal_

5

Original post by Exodium619404

Sounds like a good plan! I’m now gonna split my brain into three parts for chem bio and maths…just gonna try my best atm!!! GUYS WE CAN DO THIS!!! 6DAYS TO GO AND IM DONE

yeah, i have the bio and maths thing too but yeah its all we can do, best of luck :smile:

Reply 74

emilia 1234

6

Original post by idk222222222

topics that didn't show up in papers 1 and 2
-cell structure
-biological molecules (there was only experiments)
-nucleotides
-biological membranes
-exchange and transport
-classification and evolution
-animal responses
-PHOTOSYNTHESIS
-RESPIRATION
-cellular control
-pattern inheritance
-evolution
-manipulating genomes

did hormonal /neuronal communication show up ? i acc dont remember

Reply 75

idk222222222

3

Original post by emilia 1234

did hormonal /neuronal communication show up ? i acc dont remember

There was apparently some questions about synapses
Is endotherm and ecotherms part of the neuronal communication?

(edited 10 months ago)

Reply 76

emilia 1234

6

Original post by idk222222222

There was apparently some questions about synapses
Is endotherm and ecotherms part of the neuronal communication?

Original post by rshakir

Endotherms and Ecotherms is part of hormonal communication

not its part of homeostasis
the neuronal question was a small one though do you think its worth revising

(edited 10 months ago)

Reply 77

K_2004sNerd

1

How is everyone revising for this paper? I'm a bit lost

Reply 78

Idk131

19

Original post by K_2004sNerd

How is everyone revising for this paper? I'm a bit lost

Haven’t started tbh, focusing on other subjects. But planning on revising weakest topics and just briefly going over the rest

Reply 79

idk222222222

3

Original post by emilia 1234

not its part of homeostasis
the neuronal question was a small one though do you think its worth revising

i thought questions won't come up again from paper 1 but then i was doing a past paper yesterday and there was a 6 marker about atp in paper 1 and again a 4 marker about atp in paper 3

OCR A A-Level Biology Unified Biology [21st June 2023] Exam Chat

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