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AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

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Anyone got any thoughts on what to include in an essay about polymers? All I can think of so far is:
- Starch- amylose and amylopectin
- Cellulose
- Structure of proteins
- DNA
- could the chain of water molecules in the cohesion of water count as a polymer?

Err nice try with that last one, but no.

You pretty much have it though - polypeptides, polysaccharides and polynucleotides.

Maybe it's worth learning a few of each not in the spec: keratin might be good. I'll search and find some more

Reply 3901

lcj0503

Original post by kitkat95

enzymes,
antibodies...
Glycogen
Peptidoglycan=bacterial cell walls

Reply 3902

Eloades11

Good luck in your exam tomorrow everyone! :h:

Reply 3903

JasminC

Original post by problematic

Cohesion Tension theory (Xylem)

Base pairs AT CG (include how many of each to be fancy lol C-G is 3 Hbonds and AT is 2)

Cellulose structure - The point of myofibrils helping it's strength

The big enzyme topic - Helping it to form its specific active site

I also have a special one, classification :smile:

lol so when scientists want to see how closely related two animals are, they use DNA hybridisation
(Seperating two strands at high temperature which breaks their H-bonds, then allowing complementary bases to join)

And PCR (the use of temperature to break the H-bonds to allow exposed nucleotides)

Hope that helps

Thank youuu! yep helps a lot initially i could only think of the base pairings lol x

Reply 3904

starfish232

Original post by Mocking_bird

"Control of/within living organisms"
Control of living organisms would be biological and chemical control of pests... which is relevant.

oh I see thank you. Probably will do this essay now. :smile:

Reply 3905

MLogan

What is a DNA ladder?

Reply 3906

kitkat95

Original post by DrewYouTwo

Haha I thought the last one might be stretching it a bit. Thanks :smile:

Reply 3907

rommy123

what essays are everyone doing plans for?

Reply 3908

Joshmeid

Original post by MLogan

What is a DNA ladder?

Known lengths of DNA used to compare during gel electrophoresis.

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Reply 3909

starfish232

Original post by JessicaTSR

hmmmmmmm

this is making me think twice now.. dilemmaaaa

I don't if this will help you but perhaps would be better to do the questions first and check your answers (aim to finish within in 1 hr 30) and then that would give you like 45 mins to do the essay in which you can look at the essay and spend like 5 mins planning it and you could add to the plan as you write your essay because you'll be thinking about what else could be included.

Reply 3910

LitGeek94

Can anyone just talk through IAA a little? I know that its produced in the shoot and diffuses down the shaded side, causing the cells to grow and bend towards light, but the application for things like IAA and gravity and stuff is just not working for me... Any extra information that can help me??

Reply 3911

kingster123

can any1 tell me the methods of in vivo

Reply 3912

_jamie

What about an essay about the importance of ions in living organisms? Has that one came up before?

Reply 3913

F1's Finest

http://filestore.aqa.org.uk/subjects/AQA-BIOL5-W-QP-JUN11.PDF

Can anyone explain 5)c)ii

I just haven't got a clue what's going on.

I thought it wouldn't matter how many times your restriction enzyme cuts the DNA, surely when you add up the pieces again, you would get the same number :s-smilie:

Reply 3914

JObertelli

I'm sure it's already been written somewhere in the thread, but what do you usually need to get an A on this unit? I'm A+15 at the minute but can't see myself doing too well in this one...

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Reply 3915

FuddyMucker

Original post by _jamie

What about an essay about the importance of ions in living organisms? Has that one came up before?

Dont think there would be enough topics from 3 of the units, i can only think of diffusion and neurotransmission

Reply 3916

problematic

Hey guys, just a tip about the essay if you're looking for points. This never occurred to me, but my teacher suggested it and it works for me :biggrin:

When you want to get points for an essay, get the Spec in pdf format
Then say you wanted to know about ATP, instead of scanning it quickly, on the 'find' button, just search it up and it will highlight all the places where it's mentioned.

Reply 3917

DrewYouTwo

Original post by kingster123

can any1 tell me the methods of in vivo

Gene isolated using restriction endonuclease, plasmid cut with same endonuclease. Cleaved together via sticky ends with DNA ligase.

Plasmids introduced into cell via viral vector.

Antibiotic resistance markers are also used

Reply 3918

Dorkins

Original post by James A

Before:
----------

Partial:
----------
--------
-----
---
--

After:
-----
---
--

The restriction enzyme action takes time, so a partially digested solution will contain a bit of everything (even strands of completely untouched DNA)

(edited 10 years ago)

Reply 3919

stoppy123

Original post by LitGeek94

Ok IAA works in two ways.

in phototropism on shoots,IAA will move away from the light by diffusion and then cause elongation of cells on the shaded side.

In phototropism in roots, IAA will diffuse down to the shaded side, but as it's in a high concentration, growth will be inhibited, meaning the top side will grow more, bending roots towards the ground.

In geotropism in shoots, IAA will move to the underside of shoots so the cells will elongate and push the shoot away from gravity.

In geotropism in roots, IAA will move to the lower side, but growth will be inhibited, so the root grows downwards.