OCR Biology F212 Revision [3rd June 2013] (Now Closed)

Original post by niceguy95

I hate this exam

When a question is given judging on the markscheme, you literally write everything you know about the topic even if it wasn't the Question

So stupid,

Yeah exactly! It makes no sense!

Reply 463

Gotzz

Original post by Hannah196

guys someone help me!
what is the function of DNA polymerase in DNA replication??
please help!

It joins the sugar-phosphate backbone :smile:

Reply 464

kited4

do we need to be able to state Darwin's 4 observations and 3 conclusions?

Reply 465

Original post by kited4

do we need to be able to state Darwin's 4 observations and 3 conclusions?

Hopefully not!
It seems like a question that will trip up many and they'll start to assume what he observed and concluded...
So, in 'conclusion'!

I think it is somewhat needed!

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Reply 466

Beni24

2

When two monosaccharides join together to form a disaccharide, for example a 2 glucose monosaccharides joining together, can you also have like glucose and fructose joining together or does it have to be the same type of monosaccharide joining together? If you get what I mean? :smile:

Reply 467

kited4

Original post by Ché.

Hopefully not!
It seems like a question that will trip up many and they'll start to assume what he observed and concluded...
So, in 'conclusion'!

I think it is somewhat needed!

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Conclusions:
- There is a struggle to survive
- Better adapted organisms survive and pass on these characteristics
- Overtime these changes may cause a new species to evolve

is this correct?

Reply 468

Original post by kited4

Conclusions:
- There is a struggle to survive
- Better adapted organisms survive and pass on these characteristics
- Overtime these changes may cause a new species to evolve

is this correct?

As correct as his theory gets!
LOL.

Yes, totally correct.
I have to connect with Biodiversity a little more than the other elements; being a Chemist just makes everything else make total sense, but Biodiversity needs a little more depth of revision than others for me.

What's your pain topic?
:biggrin:

Reply 469

Gotzz

Original post by Beni24

When two monosaccharides join together to form a disaccharide, for example a 2 glucose monosaccharides joining together, can you also have like glucose and fructose joining together or does it have to be the same type of monosaccharide joining together? If you get what I mean? :smile:

They can be different :smile:

Reply 470

mariam.therese

Original post by kited4

do we need to be able to state Darwin's 4 observations and 3 conclusions?

i assume so :frown:

... the biodiversity and evolution parts of f212 are killing me

Reply 471

mariam.therese

how are people finding revision of the latter topics... biodiversity and the sort im finding them rather time consuming as im really not bothered about darwin but am thoroughly interested by dna, smoking and such ....

Reply 472

trrr

describe the structure and mode of action of phagocytes

cant seem to write notes on this. Need a bit of assistance?

Reply 473

Original post by mariam.therese

how are people finding revision of the latter topics... biodiversity and the sort im finding them rather time consuming as im really not bothered about darwin but am thoroughly interested by dna, smoking and such ....

Extremely time consuming with certain areas, yes!
I am grateful I had studied Biodiversity and Evolution at the end of the year, as I still remember it!
Give it two months... GONE.

Are you. Ready for Monday? :biggrin:

Reply 474

Original post by trrr

describe the structure and mode of action of phagocytes

cant seem to write notes on this. Need a bit of assistance?

Here it goes...
MODE OF ACTION:
They re a fundamental part of our immune defence mechanism against foreign particles with our bodies.
They obviously engulf these foreign particles once detected and the cells are initiated after antibody production.
Powerful enzymes in which can break down the particles for suitable engulfment.
Receptors are present on their membranes which can detect any foreign material beforehand.

STRUCTURES:
(Neutrophil)
- Multi lobed nucleus.
- High level of flexibility for specialised fitting around the pathogenic material.
- Shortly lived - they last up to twelve hours high the blood; a few days within the human tissue.
- Lysosomes - overlapped with above.
- Granular cytoplasm within its cell membrane.

(Monocytes)
- Oblong nuclear shaping.
- Larger than Neutrophils.
- They behave as Neutrophils when leaving the blood jut before differentiation into Macrophages in certain contexts.
- They last a very long time within the body.

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(edited 10 years ago)

Reply 475

kited4

Original post by Ché.

As correct as his theory gets!
LOL.

Yes, totally correct.
I have to connect with Biodiversity a little more than the other elements; being a Chemist just makes everything else make total sense, but Biodiversity needs a little more depth of revision than others for me.

What's your pain topic?
:biggrin:

I do A2 geography as i completed gcse geography in year 10 so we started AS in year 11, so i really quite like biodiversity!
food and health i really hate - there is a lot of content, lots of possibilities for suggest questions and my teacher for that topic was terrible

Reply 476

Hello...

Original post by trrr

describe the structure and mode of action of phagocytes

cant seem to write notes on this. Need a bit of assistance?

Phagocytes attack and Engulf Pathogens
When a Pathogen enters the body its antigens indicate that it is a foreign cell
Antibodies in the blood attach to the Antigen on the pathogen.
Phagocytes have protein molecules on their membrane which act as receptors and bind to the antibody which is currently attached to the pathogen.
Phagocyte then engulfs the pathogen which is place inside a phagosome (Like a vesicle)
Intracellular lysosomes release enzymes into the phagosome which then kill the pathogen

Reply 477

Original post by kited4

I do A2 geography as i completed gcse geography in year 10 so we started AS in year 11, so i really quite like biodiversity!
food and health i really hate - there is a lot of content, lots of possibilities for suggest questions and my teacher for that topic was terrible

AHA!
Lucky you... I am guessing you aced Geography one time!?
Well done!

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Reply 478

zoep23

can someone help? In the immune response does differentiation into plasma cells and memory cells of B/T lymphocytes occur before or after clonal expansion?

Reply 479

Original post by zoep23

can someone help? In the immune response does differentiation into plasma cells and memory cells of B/T lymphocytes occur before or after clonal expansion?

I am pretty sure that is happens after Clonal Selection and Expansion. :biggrin:

Clonal Expansion differentiates into different T-lymphocytes in which T-helper comes under.
T-helper cells help activate the B-lymphocytes in order for them to proceed into forming plasma.
:smile: