Year 12s: what will be the first way you research your future options? >>

This discussion is now closed.

Check out other Related discussions

AQA BIOL5 ~ 17th June 2013 ~ A2 Biology Thread II

Scroll to see replies

Reply 60

sahjan

Original post by Silmirel

i said sanger sequencing then gel electrophoresis

Woop! I said this too! :biggrin:

Posted from TSR Mobile

Reply 61

Eloades11

Original post by Soncheese

What did people put for the definition of codon

It was 2 marks?!

This was posted from The Student Room's iPhone/iPad App

Quite simply what 'sahjan' said, 3 adjacent nucleotides which code for an amino acid.

Reply 62

rommy123

Original post by Silmirel

i said sanger sequencing then gel electrophoresis

i put gel electrophoresis but didn't mention the sanger method :/

Reply 63

username937250

WildPidgey - I hope so because I only put it to one dp too!!!!!!

I don't think they will allow 104.89% increase as that would imply that it more than doubled.......

The cell scale.... Do you mean that each cell got longer? If so, yep I did, just as I was about to move off the question!!! *phew*

I did 10b. Talke about trophic levels, saprobionts recycling nutrients, horizontal transmission between bacterium, nitrifying bacterium in mututalistic relationship with plants, succession and ecological niches, and humans preventing succession, mating behaviours, plants having reliance on pollinators and animals to disperse seeds, and parasites good/bad. Oh and about how viruses could take over a cell to manufacture more viruses. :smile:

Fingers crossed!!!

Posted from TSR Mobile

Reply 64

Soncheese

Original post by aWildPidgey

Three base sequence/triplet 1

on mRNA 1

Possibly this

I put a single polynucleotide strand with 3 bases (triplet)

mRNA is a single polynucleotide strand would that be okay?!

This was posted from The Student Room's iPhone/iPad App

Reply 65

EmilyBoorman

Original post by Silmirel

It was??? oh my gosh :frown:

messed up that whole question then. i thought it was 2 micrometres for each?

Are you sure? I double checked the scale and i'm sure it was 2 for each?

Reply 66

Sam1357

Original post by EmilyBoorman

Am I the only one who did the relationship and interaction essay? Haha? I wrote about energy transfers and predation, competition which lead on to natural selection and relationship to a common ansestor, then I wrote about symbiosis, bacteria in the nitrogen cycle interacting with plants, bacteria in DNA science interacting with human and other organisms DNA, then wrote about the indirect and direct affects humans have n environment like hunting, global warming and eutrophication :smile:

Do you think that's ok?

Loll you'll probably get 25 marks cos the examiner will be bored ****less reading all the cell membrane essays

Reply 67

HELPIMSTUCK

Original post by James A

Why restriction mapping? Isnt it sanger method followed by gel electrophoresis to determine the order of the sequence

Posted from TSR Mobile

I have no idea. :redface:

Reply 68

FuddyMucker

The amount of How Science Works stuff in this was ridiculous, it was like doing an ISA again

Reply 69

Kutie Karen

Original post by Sam1357

Loll you'll probably get 25 marks cos the examiner will be bored ****less reading all the cell membrane essays

That is very good. I like your logic :smile:

Reply 70

David Tennant

Original post by James A

Why restriction mapping? Isnt it sanger method followed by gel electrophoresis to determine the order of the sequence

Posted from TSR Mobile

Hey James,
doesn't the sanger method cover gel electrophoresis. In the CGP book it says two ways to determine genes, one is restriction mapping and the other is sanger.

Reply 71

Sam1357

DNA- base triplet
mRNA - codon
tRNA - anti codon

thats what I was taught :/ but can a dna base triplet be referred to as a codon :/ cos I answered that question in the context of mRNA

Reply 72

aWildPidgey

Original post by EmilyBoorman

Are you sure? I double checked the scale and i'm sure it was 2 for each?

It was, whoever said it wasn't is wrong

Reply 73

JaloD

Haha, I said sanger sequencing, gel electrophoresis and also restriction mapping :/

Reply 74

sahjan

Original post by LittleRit

I did 10b. Talke about trophic levels, saprobionts recycling nutrients, horizontal transmission between bacterium, nitrifying bacterium in mututalistic relationship with plants, succession and ecological niches, and humans preventing succession, mating behaviours, plants having reliance on pollinators and animals to disperse seeds, and parasites good/bad. Oh and about how viruses could take over a cell to manufacture more viruses. :smile:

Fingers crossed!!!

Posted from TSR Mobile

How did you mention so much?! :redface:

I only mentioned about 4 topics at most :frown:

I was told 40 mins to leave at the end of the exam to do the essay, and I just couldn't find the time to write about everything else I knew D:

Posted from TSR Mobile

Reply 75

saba146

for the membrane esay i talked about
structure of membrane - phospholipid bilayer
protiens in the membrane - channel carrier and hot this is important in resting potential
talked about receptors on cell membranes- in synapses and talked about antigens being presented on cell membrane briefly
talked about uptake in root hair cells
talked about diffusion on c02 and 02 across alveoli and 02 into the red blood cells - then a bit on hemoglobin - of tangent
and then respiration - mitochondrial membranes

is this relevantt??

Reply 76

Tikara

Original post by David Tennant

Hey James,
doesn't the sanger method cover gel electrophoresis. In the CGP book it says two ways to determine genes, one is restriction mapping and the other is sanger.

yeah thats what I thought - I just put DNA sequencing via the sanger method

Reply 77

hannah1994

That paper was soo hard i feel like crying. Like each question wasn't that difficult but collectively it was just awful. I know I screwed up the essay too. Everyone I've spoken to seems to think it was alright whereas I just think it was terrible :frown:

Reply 78

saba146

Original post by aWildPidgey

It was, whoever said it wasn't is wrong

what did you put for the 3 differences i put nucleus gets smaller, vacuole gets bigger and morestarch grains??