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A2 Biology OCR June 2015 Revision Thread

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How much genetics stuff will come up? :smile:

I think big question on genetic cross, meaning of some keywords like allele, then chi-squared calculation

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Reply 3741

FredRussell97

Worth doing an all nighter? Last exam and need a high C?

Reply 3742

Student23478

Original post by peanutcracker20

how old

Like 07-10 papers

predictions?

Hit "like" if you're so ****ed for this exam, and all you want to do is just sleep, describes me right now tbh ://

Reply 3745

Eleanorb97

Original post by RichBitch

Because I literally know nothing as I've been busy watching TV for 5 days in a hospital and I finally got out! I'll do an allnighter, after all it is my last and final exam!!!!!
does anyone have any tips and resources I could use please it's urgent!!!!

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I would say briefly go over the wishy washy chapters like ecosystems, as a lot of it is common sense. Definitely go over genetics! It's such a big chapter there is bound to be multiple questions on it. I'm going through past papers and looking up the questions/topics I really get stuck on, good luck!!!

Reply 3746

Lizzieee4

Original post by wanna get laid

Dont worry bro. Everyone will fail cos we all have a shiz load of exams this week and stuff

Boundaries gonna drop like to 60 for an A

It's possible brah. It's possible :yes:

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Physics unit 5 the day after F215.... :frown:

Reply 3747

Lychees

Can someone PLeASE tell me why there are two ways to sequence a genome and which one I should use if they ask. In the OCR book on page 166 they say the method of using BACS which I haven't learnt because a few pages ahead 172 they give another method using fluorescent markers so which one do I use

Reply 3748

peanutcracker20

Original post by domcandrews

Hit "like" if you're so ****ed for this exam, and all you want to do is just sleep, describes me right now tbh ://

same here so tired had psychology exam this morning and all i wanna do is sleep...but cannot fail biology

Reply 3749

BioAgent

Original post by bakedbeans247

YES YOU CAN!! JUST DO IT!!!

https://www.youtube.com/watch?v=nuHfVn_cfHU

Bro If Ramadan is tomorrow its gonna be peek!

Reply 3750

peanutcracker20

Original post by Student23478

Like 07-10 papers

this had 2010 papers if that any help http://www.ocr.org.uk/qualifications/as-a-level-gce-biology-h021-h421/

Reply 3751

domcandrews

Original post by peanutcracker20

same here so tired had psychology exam this morning and all i wanna do is sleep...but cannot fail biology

Yeah should be illegal to have this many exams in a short space of time, I mean where are my human rights? Pray for low grade boundaries

Reply 3752

Alltimesarah

how can you know which vector to use?

Reply 3753

peanutcracker20

Original post by tewas

Anybody have any questions they want answered?

can you put the nitrogen cycle into a serious of bullet points please?

Reply 3754

wanna get laid

Ok everybody, i got a wicked plan

If we all get 0 marks tomorrow on purpose then maybe grade boundary will be 0 marks for full ums :smug:

But this will only work if like everyone gets 0 marks ok. So no cheating
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Reply 3755

Eleanorb97

Original post by laurenjadex

Can anyone give me an overview of the advantages of innate behaviour?

Survival:
-animals able to respond quickly to predators to avoid being killed
-animals respond quickly to be able to catch prey
-helps animal stay in an advantageous habitat (eg kinesis helps woodlice. Stay in humid conditions)
-doesn't require any thought, learning or practice, the animal is always ready

Reply 3756

Lizzieee4

Original post by Lychees

There are several different methods of sequencing it. I recon if it comes up it'll accept both methods as both methods are correct and are in the OCR 'approved' books.

(edited 8 years ago)

Reply 3757

coolerthanbeans

Original post by peanutcracker20

has anyone got any tips for conservation and ecosystems and plant hormones and animal behavior cannot get my head round them

I resorted to making a dance for each of the plant hormones as they weren't sticking in my head. I look like an idiot when I do it but remembering the steps with each hormone is actual really helpful! I recommend it :smile:

Cutting out the main waffle of the other topics, my basic notes to remember are:

Conservation:
-Dynamic, maintenance of biodiversity
-Require management and reclamation
-Includes preservation of organisms that are at risk of human activity

Preservation:
-Protection of areas unused and untouched by humans

Behaviour is split into learned and innate.

Innate:
Stereotypical, inherited.
This behaviour is most important to those with short life spans that live solitary lifestyles and don't need to care for their offspring.

Learned:
Modified, based on experience.
e.g. associative learning
Beneficial for those with longer life spans that have time to learn

(edited 8 years ago)

Reply 3758

peanutcracker20