just a warning but dont have that mentality - every topic will get tested in some way or another either mcq, short answered questions or long answered questions so just revise everything

Reply 63

lol2468

Universities Forum Helper

14

Original post by JA03

I don’t know what to do. I can’t understand the stuff around the sliding filament hypothesis.

what exactly are you struggling on?

OP

Original post by bebe1108

There was a question on it last year so hopefully it won't come up this time :s-smilie:

O. You’re so helpful.

OP

Original post by lol2468

what exactly are you struggling on?

The stuff about the ACTUAL sliding filament. All I know is that myosin binds and unbinds to actin, moving further along the filament. I know nothing else.

Reply 66

ikioluu

6

Original post by vesq

Im ****ed

don’t catastrophize. you’ve got about 2 weeks, I would say focus on active recall (blurting, flash cards) and memorising mark scheme and you’ve honestly got this.

Reply 67

OCRs biggest opp

13

ocr made physics reaaalllyyyyyy hard

its not looking good guys. its not looking good.

Reply 68

ijernign

9

Original post by OCRs biggest opp

ocr made physics reaaalllyyyyyy hard

its not looking good guys. its not looking good.

anyone have any mnuemonics to remember things such as King Phillip Can Order For Good Soup and others ?

Reply 69

megagoose

1

i honestly gave up on biology ages ago ive only ever got two grades on every test ive ever done and they've been Es. there is literally no way of passing this a level bc at this point i'd have to learn 2 years of content in a few weeks. fml

Reply 70

DS13990609

9

So I looked at papers from 2017 to 2022 and I have made a document that contains all of the major topics that came up. I only focused on Section B, as that is literally 85% of the entire paper. I have also added the prediction topics made by Primrose Kitten. Yes, I bought paper 1 only to experiment, just to see if her predictions are accurate because so many people are saying they are good and some say that they are dead. Anyway, I'm going to drop the link to the document below. Just remember to focus on everything, especially topics like action potential and excretion because there will always be a question about identifying the structure from the insert. You can use this website to get exam questions. These questions are from Save My Exams but there are model answers as well so you don't have to waste time finding the question online or buy the £25 subscription:
https://chemistryonlinetuition.com/ocr-a-level-biology-topic-questions/

The link to the document:
https://docs.google.com/document/d/11KaMWppCA0RTdBy_TUJj7obqzOhzT9iIlbUWnZS9ys4/edit?usp=sharing

Anyways happy revising

Reply 71

aaccdd

12

Original post by JA03

The stuff about the ACTUAL sliding filament. All I know is that myosin binds and unbinds to actin, moving further along the filament. I know nothing else.

youre right about the binding and unbinding, just needs more detail. so calcium ions from the sarcoplasmic reticulum will bind to troponin and cause a conformational change which disrupts the tropomyosin and actin complex in order to expose the biding site on the actin. the myosin head will attach to the binding site on the actin fillament which results in an actin-myosin crossbridge. the myosin head then flexes which moves the actin fillamen along and whilst doing this, a molecule of ADP is released. ATP will now attach to the myosin head causing myosin head to detach from the actin fillamet. the ATP will then be hydrolysed into ADP + Pi to provide energy for the mysoin head to return to its original position after detaching. Now, the myosin head can bind to another actin binding site, further along the fillament and this process is repeated

OP

Original post by aaccdd

youre right about the binding and unbinding, just needs more detail. so calcium ions from the sarcoplasmic reticulum will bind to troponin and cause a conformational change which disrupts the tropomyosin and actin complex in order to expose the biding site on the actin. the myosin head will attach to the binding site on the actin fillament which results in an actin-myosin crossbridge. the myosin head then flexes which moves the actin fillamen along and whilst doing this, a molecule of ADP is released. ATP will now attach to the myosin head causing myosin head to detach from the actin fillamet. the ATP will then be hydrolysed into ADP + Pi to provide energy for the mysoin head to return to its original position after detaching. Now, the myosin head can bind to another actin binding site, further along the fillament and this process is repeated

Are you predicted an A* or smthn?

Reply 73

aaccdd

12

Original post by JA03

Are you predicted an A* or smthn?

nah i just like mod 5

OP

Original post by aaccdd

nah i just like mod 5

That’s fair. I do too, except animal responses. That’s the bane of my existence.

Reply 75

vesq

13

I hate neuronal communication, especially the synapse, theres so much to remember. fml

OP

Original post by DS13990609

So I looked at papers from 2017 to 2022 and I have made a document that contains all of the major topics that came up. I only focused on Section B, as that is literally 85% of the entire paper. I have also added the prediction topics made by Primrose Kitten. Yes, I bought paper 1 only to experiment, just to see if her predictions are accurate because so many people are saying they are good and some say that they are dead. Anyway, I'm going to drop the link to the document below. Just remember to focus on everything, especially topics like action potential and excretion because there will always be a question about identifying the structure from the insert. You can use this website to get exam questions. These questions are from Save My Exams but there are model answers as well so you don't have to waste time finding the question online or buy the £25 subscription:
https://chemistryonlinetuition.com/ocr-a-level-biology-topic-questions/

The link to the document:
https://docs.google.com/document/d/11KaMWppCA0RTdBy_TUJj7obqzOhzT9iIlbUWnZS9ys4/edit?usp=sharing

Anyways happy revising

You’re a star.

Reply 77

username5843686

10

for paper 1 what practicals usually come up ?

Reply 78

2ellsbells

5

please could someone explain ultrafiltration and selective reabsorption in the excretion topic! i have never got my head around it and I’m really stressing out!! thank-you

Reply 79

ijernign

9

Ur the goat

Original post by DS13990609

So I looked at papers from 2017 to 2022 and I have made a document that contains all of the major topics that came up. I only focused on Section B, as that is literally 85% of the entire paper. I have also added the prediction topics made by Primrose Kitten. Yes, I bought paper 1 only to experiment, just to see if her predictions are accurate because so many people are saying they are good and some say that they are dead. Anyway, I'm going to drop the link to the document below. Just remember to focus on everything, especially topics like action potential and excretion because there will always be a question about identifying the structure from the insert. You can use this website to get exam questions. These questions are from Save My Exams but there are model answers as well so you don't have to waste time finding the question online or buy the £25 subscription:
https://chemistryonlinetuition.com/ocr-a-level-biology-topic-questions/

The link to the document:
https://docs.google.com/document/d/11KaMWppCA0RTdBy_TUJj7obqzOhzT9iIlbUWnZS9ys4/edit?usp=sharing

Anyways happy revising

OCR A A-Level Biology Biological Processes [7th June 2023] Exam Chat

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