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AQA A2 Biology BYA8 (17th June): Written Synoptic Paper

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Reply 80

Isometrix

JonnoE

Usually sticks around 96 to 97 out of 120.

in raw marks please :smile:

what's the paper out of in raw marks, and how many do you need for an A (on average)?

Reply 81

Kinkerz

Isometrix

in raw marks please :smile:

what's the paper out of in raw marks, and how many do you need for an A (on average)?

Your scaled coursework mark, x/60 is added to the raw written mark, y/60 to give a total of 120.

x+y/120 is then scaled into a UMS mark.

Usually, you need 96 or 97/120 for an A.

It's all very annoying and seemingly over complicated.

Reply 82

kieraaa

jaison2

what are the chances of genetic engineering coming?

really really really low HOPEFULLY
i hate genetics.

Reply 83

Isometrix

Kinkerz

thanks!

how's revision going?

Reply 84

Kinkerz

Isometrix

thanks!

how's revision going?

I have no idea...

I don't really understand how to revise for this exam. You're just automatically expected to know everything and be able to either a) interpret it from a table/diagram, or b) structure it poetically into an essay.

I've 'deepened' my knowledge of respiration and gone through digestion again. Not sure what else to do really. Had a think about some essay topics.

You?

Reply 85

siQ

I think an essay on either "lipids" or "light and living organisms" might come up

Reply 86

Isometrix

Kinkerz

mainly going through AS stuff. might look through a few past papers by the end of tonight. glad it's in the afternoon, i need as much time as possible to recap everything from last year!

Reply 87

candle

siQ

I think an essay on either "lipids" or "light and living organisms" might come up

..we should put some notes down..have no idea what i would write about this , apart from photosynthesis..

and Yes please i would want the lipid one too. :woo:

Reply 88

scaryhair

Can't really think of much for negative feedback. Basically all of the homeostasis stuff, sex hormones and water balance and thats all I can think of. Any other ideas?

Reply 89

hassan90

scaryhair

Can't really think of much for negative feedback. Basically all of the homeostasis stuff, sex hormones and water balance and thats all I can think of. Any other ideas?

Co2 and pH level increase in gas exchange so inspiratory center sends impulses etcc I THINK there was another negative feedback to do with the heart... dno cant think of it :s-smilie:

Reply 90

kieraaa

lipids:

phospolipid bilayer
digestion
respiratory substrate
composition
biochemical test
casparian strip
myelin sheath
insulation

negative feedback:
homeostasis - thermoregulation and osmoregulation as well as blood glucose
ventilation - stimulation of chemoreceptors
hormones - LH/oestrogen
population stability - competition/predators/stabilising selection

(i cant take credit for these, cant remember who put them out there but i found them helpful :smile:

)

Reply 91

kieraaa

for light could you talk about behaviour ie taxis and kinesis...

Reply 92

Abdul_lahi

Going to sit down with all the topics you helpful lads and ladies have mentioned and kind of brainstorm(think thats politically incorrect so I will say mindmap if you take offence to it)every angle possible. So atleast I can kind of go in and write satisfactory amounts in the 25 markers.

Any other sites for notes and advice would be helpful.

Thanks

Ab

Reply 93

hassan90

kieraaa

for light could you talk about behaviour ie taxis and kinesis...

Yeah and also can I think you can talk about Trophic levels..food webs as in the producers get all energy from light first.

Reply 94

siQ

Light and living things/ the importance of light:
Essay Plan

A)Plants
-Photosynthesis (BYA5)
-Limiting factors and photosynthesis (BYA2)
-Light, photosynthesis and ecolgy (BYA5)

B) Animals
-Taxes and kineses in response to light (BYA6)
-Mammalian eye (BYA6)

Lipids:
Essay Plan

-Biochemistry of lipids
-Testing for lipids
-Phospholipids
-Digestion and absorption of lipids in humans
-Ruminants and fatty acids
-Waxy cutices
-Casparian strip and significance for root pressure
-Myelin sheath and significance for saltatory conduction

Reply 95

Azori

These plans are really helpful, does anyone have any more?
Thanks :smile:

Reply 96

hassan90

siQ

Light and living things/ the importance of light:
Essay Plan

A)Plants
-Photosynthesis
-Limiting factors and photosynthesis
-Light, photosynthesis and ecolgy

B) Animals
-Taxes and kineses in response to light
-Mammalian eye

Lipids:
Essay Plan

-Biochemistry of lipids
-Testing for lipids
-Phospholipids
-Digestion and absorption of lipids in humans
-Ruminants and fatty acids
-Waxy cutices
-Casparian strip and significance for root pressure
-Myelin sheath and significance for saltatory conduction

Can you expand on the casparian strip and ruminants please?

Reply 97

siQ

The importance of membranes:
Essay plan

-General structure and function of membranes (BYA1)
-Membranes and surface area (BYA1/5/6)
-Permeability of membranes (BYA1/6)
-Membranes and receptors (BYA1/6)
-Membranes and immunity (BYA2)

The importance of DNA:
Essay plan

-Structure of DNA (BYA2)
-Cell devision (BYA2/5)
-Gene Technology (BYA2)
-Variation and inheritance (BYA5)
-Selection and speciation (BYA5)

Reply 98

siQ

hassan90

Can you expand on the casparian strip and ruminants please?

Ruminants and fatty acids
-Bacteria, anaerobic respiration, fatty acids used as main energy source by cow.

Also isn't the Casparian Strip made from lipid?
The cell wall of the endodermis contains a casparian strip, which is waterproof which is made of suberin. Water cannot cross this barrier and is diverted into the cytoplasm (cannot continue apoplast pathway). So all the way travels through cytoplasm or vacuole.