OCR A Level Biology Biological processes H420/01 - 9 Jun 2022 [Exam Chat]

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do insects have a single or double circulatory system ? i can’t see it anywhere 😭

I don’t think u need to know that just know it’s open circulatory system haemolymph that has no or lacks oxygen flowing to the haemoceal which is the open cavity at low pressure slowly

Reply 381

sagr1ka

Original post by userstudent12

Quick q, how does the structure of myosin and actin link to their function

myosin thick filaments contain myosin heads that have adp attached to bind to the actin myosin binding sites on the actin forming cross bridges

actin are thin filaments that have the actin myosin binding sites and have tropomyosin covering these sites. when a ca2+ ion binds to the troponin it initiates thin filament activation exposing actin myosin binding sites

idk if there will be anymore but thats j what i understood

Reply 382

ðŸ§¸medical hope

This exam better be doable and not so hard

Reply 383

aliaa03

Original post by 🧸medical hope

This exam better be doable and not so hard

righttt !! i’m so worried 🥲🥲🥲

Reply 384

jobangz

Do you think most people have mainly just learnt the advanced info over everything else

Reply 385

liv.sjones

Original post by jobangz

Do you think most people have mainly just learnt the advanced info over everything else

I think most people I know have learnt everything but gone thru advanced info in more detail cos thats where most of the marks are going to be

Reply 386

Shambhavi.mohare

Original post by liv.sjones

I think most people I know have learnt everything but gone thru advanced info in more detail cos thats where most of the marks are going to be

Yes that's what I have done too. It's today guys! GOOD LUCK!! SMASH THEM!!!

Reply 387

biycye

Original post by liv.sjones

I think most people I know have learnt everything but gone thru advanced info in more detail cos thats where most of the marks are going to be

I don’t think most people have learnt everything tbh everyone in my school is just doing advanced info and then praying

Reply 388

ðŸ§¸medical hope

Original post by biycye

I don’t think most people have learnt everything tbh everyone in my school is just doing advanced info and then praying

Lol

Reply 389

liv.sjones

honestly it should be absolutely fine, the exam board don't want everyone to fail and at most it'll be like 1 question & maybe a couple multiple choice not from advanced info

Original post by biycye

I don’t think most people have learnt everything tbh everyone in my school is just doing advanced info and then praying

Reply 390

sunny225

Just to clarify paper 1 is modules 1,2,3,5 paper 2 is 1,2,4,6 and paper 3 is all of them?

Reply 391

sk09909

Original post by sunny225

Just to clarify paper 1 is modules 1,2,3,5 paper 2 is 1,2,4,6 and paper 3 is all of them?

Think so. Should be on the spec just to check

Reply 392

DarthyDude

guys any ideas on what pags might come up in this exam?

Reply 393

aliaa03

i thought we were given standard deviations formula but in this paper from 2017 they just asked you to calculate it without the formula ? :frown:

Reply 394

tashaaaaw

Original post by aliaa03

i thought we were given standard deviations formula but in this paper from 2017 they just asked you to calculate it without the formula ? :frown:

mean of the squares - square of the mean
all square rooted

mean is first because SD is mean

Reply 395

Cactusmaths

Original post by sunny225

Just to clarify paper 1 is modules 1,2,3,5 paper 2 is 1,2,4,6 and paper 3 is all of them?

Yep, thats what i think!

Reply 396

Eyinoju

Original post by aliaa03

i thought we were given standard deviations formula but in this paper from 2017 they just asked you to calculate it without the formula ? :frown:

square root(sum of (mean-mean^2)/n-1)

Reply 397

batoolfatymah

Can someone please explain why standard deviation is better than just the mean and what does it suggest?

Reply 398

Holamysel

Original post by aliaa03

i thought we were given standard deviations formula but in this paper from 2017 they just asked you to calculate it without the formula ? :frown:

Im pretty sure that was a mistake cuz they published a post-exam correction thing: https://www.ocr.org.uk/Images/471873-question-paper-biological-processes-post-exam-correction-.pdf

Reply 399

teeee7

i hope theres a 9marker on like respiration and muscle contraction

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OCR A Level Biology Biological processes H420/01 - 9 Jun 2022 [Exam Chat]

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