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AQA BIOL2~3rd June 2013~AS Biology (Now Closed)

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Original post by PurplePhoenix
Haemoglobin
Water movement through roots
Meiosis
Biodiversity

These things are what were noticeably missing from the Jan 13 paper.


What could we get on things like biodiversity?


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Original post by oak12
- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the left
- lower affinity
- so more oxygen is unloaded to respiring cells


The oxygen dissociation curve needs to be to the right, not to the left, so that is has a lower affinity for oxygen so that it can unload oxygen easily for respiring tissue for respiration, to generate enough heat to maintain an optimum body temperature.
Original post by oak12
- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the left
- lower affinity
- so more oxygen is unloaded to respiring cells


Don't you mean the curve moves to the right?
Reply 2263
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bad8oy
14
Original post by laithmo96
Don't you mean the curve moves to the right?


Yeah it moves right lol


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Reply 2264
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dooobie_
Currently going through the revision guide and highlighting any sections I dont like.. then I'll read through my text book then read through the revision guide a final time and do some past papers around 9! Sickk:frown: I can't wait for this to be over

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What does everyone think will come up?
Reply 2266
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bad8oy
14
Original post by Jimmy20002012
What could we get on things like biodiversity?


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Calculations genetic bottle neck founder effect and farming


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Reply 2267
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oak12
9
sorry,

my mistake above

typo

i'll reread next time

its to the right
Reply 2268
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dooobie_
What have been the last 6 marker questions?

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Reply 2269
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Paige95
Original post by Manni
Fantastic thank you

Do we specifically need to know about amylose and amylopectin, or can we just write alpha glucose?
Reply 2270
Avatar for oak12
oak12
9
rushing!

thanks for the correction
Original post by oak12
- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the left
- lower affinity
- so more oxygen is unloaded to respiring cells

What question does this answer??
Original post by oak12
- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the left
- lower affinity
- so more oxygen is unloaded to respiring cells


Right?

As oxygen is more readily released to the tissue and so the haemoglobin supplies more oxygen to enable the muscles to respire rapidly in order to produce sufficient heat
to main the body temperature of the small mammal.
(edited 10 years ago)
All those 6 mark questions above, did they actually appear on past papers or are they possible questions that might be asked tomorrow?
Reply 2274
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dooobie_
What do we need to know about potometers? I completely forgot about this and it isnt in any revision guide!

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Reply 2275
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oak12
9
Original post by Suzanna5678
What question does this answer??


its for mammal size and affinity, should read:

- smaller the mammal
- larger the surface area to volume ratio
- more heat loss
- respires more to generate heat
- curve is to the RIGHT
- lower affinity
- so more oxygen is unloaded to respiring cells
Original post by Paige95
Do we specifically need to know about amylose and amylopectin, or can we just write alpha glucose?


Just alpha glucose amylopectin and amylose are good to remember for Ur synoptic essays in unit 5 tho :awesome:

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Reply 2277
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dooobie_
Original post by buzzing22
What does everyone think will come up?


I think antibiotics and cell cycle will definitely come up. If there are big markers about plants I'm screwed because I find it so hard!

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1 question,
Is there fluid in any part of an insect's tracheoles?
Teachers have told me different to my textbook unless I either wasn't listening or somehow can't read.

Quote me please :biggrin:
REP AVAILABLE
Reply 2279
Avatar for oak12
oak12
9
potometer:

- used to measure rate of transpiration
- actually measure rate of water uptake
- this is proportional to water loss
- which is affected by transpiration, but also photosynthesis, making cells turgid and loss of water from the tubing

- preparing the equipment
- make sure the shoot and leaf are healthy
- cut shoot underwater (maintains continuous column in xylem and prevents air bubbles entering)
- cut shoot at an angle
- make sure all tubing are air tight and water tight

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