AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

What about the other one marker where it said write the percentage of uracil in the DNA, it was 0, 0 right?

There is almost a 0% chance that you will get >22 marks.
The examiners are told to make it so that roughly 15% of the candidates get above 12 marks for scientific content, if you made no more than one mistake; then you could maybe get 14. 3 for breadth, usually they give 2 for both relevance and QWC and as you have so much I'd expect that. So probably at the most 20-22, hope that helped :smile:

hey how come i would get only 14 for content
i wrote quite a lot of points in alot of detail
just wondering :s-smilie:

Reply 3262

choc1234

Original post by Benevolence

I'm sorry that people have been ignoring you :/

Some of these questions have been adressed earlier on in the thread.

If you tell me what you would like to know, I will tell you :smile:

hi i need 100 ums in this for an A
i was just wondering could you run through your answers on the IAA/NAA question, and the pupa (last question) i think i lost most marks on these too
i also didnt get 80% for the percentage
and i think i got the uracilbase % wrong
also a couple of the restriction mapping q's wrong
however my essay was okay i think
so i would be really grateful if you could put down your answers thanks

Reply 3263

TlanTlan

6

It's ok AQA i didn't really want to go to university anyway... *******s.

Reply 3264

lou12

Original post by choc1234

hi i need 100 ums in this for an A
i was just wondering could you run through your answers on the IAA/NAA question, and the pupa (last question) i think i lost most marks on these too
i also didnt get 80% for the percentage
and i think i got the uracilbase % wrong
also a couple of the restriction mapping q's wrong
however my essay was okay i think
so i would be really grateful if you could put down your answers thanks

does anyone remember the questions for siRNA? And how many marks the questions on siRNA were out of in total?

Reply 3265

Teva

do you have to hit the 4 points in the essay - genes, cells, ecology and something else? i only wrote about the nitrogen, carbon, oestrous, krebs, calvin and didnt talk about anything to do with genes. will i have definitely have lost breadth marks/scientific content marks?? thanks

(edited 12 years ago)

Reply 3266

Teva

Original post by lou12

does anyone remember the questions for siRNA? And how many marks the questions on siRNA were out of in total?

i think they asked how siRNA will affect protein synthesis and how it can be used to treat disease... maybe another qu. too?

Reply 3267

choc1234

for the lysosomes i put that their numbers increased as lysosomes functions are to digest worn out organelles/cells etc
for the rna in the first part i put it decreased because protien wasnt being made as it wasnt being required - im guessing this is 0 marks
for the hydrolysos condensationi just put that cond is required to join lots of amino acids together via peptide bonds
for the seeds one i put there is variation as its sexual and so different shaped leaves will be prod for example leading to diffferent yields
for the chromosone one i put that it depends on the dna i packed and coiled into the chromosone - i believe this is wrong

Reply 3268

TlanTlan

6

Original post by Teva

do you have to hit the 4 points in the essay - genes, cells, ecology and something else? i only wrote about the nitrogen, carbon, oestrous, krebs, calvin and didnt talk about anything to do with genes. will i have definitely have lost breadth marks/scientific content marks?? thanks

You pulled from 5 different areas, although carbon and nitrogen could be considered as 1, so you have got the 4, so you got the breadth marks.

I managed to pull from 5, as i shoehorned the cell cycle in.

Reply 3269

choc1234

Original post by TlanTlan

It's ok AQA i didn't really want to go to university anyway... *******s.

hey could read my post and help me out htanks

Reply 3270

Teva

oh yeah, what did people put for why every plant will not respond in the same way to NAA uptake through the lower and upper surfaces? i put because some plants wont have a waxy cuticle... is this feasible? :L
..and for the seeds one i put you dont grow from seeds because theyre not genetically identical and its a much slower process? what did other people think? :smile:

Reply 3271

lou12

And what was the qu about the upper and lower leaves and something about NAA

Reply 3272

choc1234

Original post by lou12

And what was the qu about the upper and lower leaves and something about NAA

i put on the lower epidermis there are stomata so the uptake of it will be quicker

Reply 3273

choc1234

i really hope around 55 is an A

Reply 3274

Teva

Original post by lou12

And what was the qu about the upper and lower leaves and something about NAA

i put quicker uptake on lower due to no upper waxy cuticle being hard for NAA to permeate through or something...

Reply 3275

olimyster64

What was the question for the % of uracil ? Was it % of uracil in the DNA or in the mRNA because im not sure if i read it right i thought it was mRNA so i put like 21 and 18 but obviously if it was DNA it would be 0 and 0 ??

Reply 3276

goodboy4444

1

Original post by Teva

oh yeah, what did people put for why every plant will not respond in the same way to NAA uptake through the lower and upper surfaces? i put because some plants wont have a waxy cuticle... is this feasible? :L
..and for the seeds one i put you dont grow from seeds because theyre not genetically identical and its a much slower process? what did other people think? :smile:

What was the question aboutseeds??? I just can't remember anything about seeds????thanks :smile:

Reply 3277

lou12

Original post by choc1234

i really hope around 55 is an A

What did you say for the evidence in the table of the cells being totipotent

Reply 3278

stephenc

Original post by lou12

What did you say for the evidence in the table of the cells being totipotent

Callus was produced.

Reply 3279

Seasick Steve

12

Original post by olimyster64

What was the question for the % of uracil ? Was it % of uracil in the DNA or in the mRNA because im not sure if i read it right i thought it was mRNA so i put like 21 and 18 but obviously if it was DNA it would be 0 and 0 ??

I hope it was asking about mRNA, because I put 18 & 21 % too :/

Original post by choc1234

for the lysosomes i put that their numbers increased as lysosomes functions are to digest worn out organelles/cells etc

I said the number of lysosomes would decrease with age, because fewer lytic enzymes are needed, because most breaking down of proteins occurs in the early stages of pupal development. You might be right though - I mean, I was close to saying the numbers would increase, but I guess we'll just have to wait and see.

AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

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