AQA A2 Biology BIOL5 - 17th June 2015

Reply 1720

AmyT997

3

Original post by DecantedOrange

2.2:1?

2.27:1

will just depend on graph reading but hopefully we're right :smile:

Reply 1721

DecantedOrange

3

I did essay 1, wrote about
Taxis and kinesis
Homeostasis - temperature/blood pH and pressure
Immune system
Migration of birds
Feedback mechanisms - the testosterone from earlier in the paper lol, oestrus cycle and something else

Wrote about 6 pages

(edited 8 years ago)

Reply 1722

sarah_7

Original post by JulietR

I got 1:0.44 as well

Posted from TSR Mobile

yay! Hopefully it's right! :smile:

Reply 1723

Martin11

1

Ugh hated that exam, I knew nothing about antibodies <.<

For essay though, I picked the first one though I'm not sure if they're right and did:

- Homeostasis (Glucose/Temperature)
- Positive feedback (Menstrual cycle/Blood clotting)
- Taxis and Kinesis
- Tropism
- Reflex arc

Good bye uni

Reply 1724

caffeinefuelled

10

Original post by Regina15

What did people include in their essays(internal/external)? I hate 'importance of' questions.

I wrote about reflex arcs and the importance (avoiding harmful stimuli), thermoregulation and importance of that for enzymes, blood pH maintenance via gaseous exchange and importance of that for enzymes, immune response and importance of that in not getting ill (an invading pathogen is a change in the internal environment) and I wrote a little bit on glucoregulation then ran out of time

Reply 1725

Regina15

2

Original post by JulietR

You must have written loads!

Posted from TSR Mobile

It sounds it but no :')

Reply 1726

caffeinefuelled

10

Original post by AmyT997

2.27:1

will just depend on graph reading but hopefully we're right :smile:

I got 2.27

Reply 1727

tabi100

Original post by DecantedOrange

2.2:1?

me and my friends got 2.2:1

Reply 1728

talkbiology

9

I absolutely loved that paper! 3 marks on DNA methylation and 3 marks on Pacinian corpuscle etc...
For the ratio I put something like 118:53, I left it as a whole number ratio but you don't have to, that would be the same as 2.2:1 or 1:0.45 for anyone who put those

Reply 1729

DecantedOrange

3

Overall I thought it was okay, not too bad and not too good…

Reply 1730

sn4kebiteheart

2

Original post by JulietR

Temperature regulation as this affects enzymes in respiration etc
Control of heart rate due to changes in blood pressure etc
Osmoregulation in the kidney to prevent dehydration
How haemoglobin dissociation changes in different parts of the body depending on changes in partial pressure of oxygen

Posted from TSR Mobile

I did...

chemoreceptors/baroreceptors (control of heart rate)
temperature - ectotherms (behaviour) and endotherms (hypothalmus) as it may effect enzymes
glucose control (glycogenolysis, gluconeogenesis)
global warming (melt of ice caps = flooding = loss of finance for farming)
extra knowledge - psychology exogenous zeitgebers/endogenous pacemakers and sleep wake cycle :smile:

Reply 1731

Regina15

2

Original post by smoothER

I wrote about reflex arcs and the importance (avoiding harmful stimuli), thermoregulation and importance of that for enzymes, blood pH maintenance via gaseous exchange and importance of that for enzymes, immune response and importance of that in not getting ill (an invading pathogen is a change in the internal environment) and I wrote a little bit on glucoregulation then ran out of time

Oh reflex arcs, I was going to right about that too but ran out of time as well:/

Reply 1732

Gee1234

7

I've never had to "suggest" so many things in my life...

Reply 1733

talkbiology

9

For essay a) (did anyone actually do b)? I'm interested) I wrote about temperature regulation, blood glucose, stomata closing in response to external conditions/photorespiration, phototropism, and for some reason, the regulation of CoA biosynthesis to illustrate feedback inhibition of enzymes..

Reply 1734

tabi100

Original post by SandyMan

Th reason why the grade boundaries are so low is because the mark scheme is strictatat

what are the grade boundaries ?

Reply 1735

Bustamove

19

Original post by talkbiology

I absolutely loved that paper! 3 marks on DNA methylation and 3 marks on Pacinian corpuscle etc...
For the ratio I put something like 118:53, I left it as a whole number ratio but you don't have to, that would be the same as 2.2:1 or 1:0.45 for anyone who put those

I got 118:53 as well... I had a heart attack seeing everyone else put 2.2:1

Reply 1736

MollyMcFly1

13

Think that was ok!! :biggrin:

Reply 1737

tabi100

Original post by sarah_7

yay! Hopefully it's right! :smile:

Ratios have to be something; 1 as you have to divide by the smaller number not the larger one

Reply 1738

talkbiology

9

Judging from past mark schemes on ratio questions you can leave it as a whole number ratio or cancel it down to make either of the numbers 1 or basically whatever as long as it is a mathematically correct ratio

Original post by Bustamove

I got 118:53 as well... I had a heart attack seeing everyone else put 2.2:1

Reply 1739

jack_ob96

3

Original post by talkbiology

For essay a) (did anyone actually do b)? I'm interested) I wrote about temperature regulation, blood glucose, stomata closing in response to external conditions/photorespiration, phototropism, and for some reason, the regulation of CoA biosynthesis to illustrate feedback inhibition of enzymes..

I did B! Topics I did where:

Tumour supressor genes + proto-onco genes
Oestrogen and transcriptional factors
Control of Oestrus cycle (feedback loops)
Speciation + selection

Anyone else do B?

AQA A2 Biology BIOL5 - 17th June 2015

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