AQA A2 Biology BIOL5 - 17th June 2015

Reply 1540

SamuelSingleton

13

Original post by bioevangelist

So long as you talk about H+ ions and HCO3- ions when carbonic acid dissociates in water. Kidney is not on AQA spec.

be careful with your wording of dissociates in water getting into some v heavy chemistry there

Reply 1541

charlottei

11

Original post by chemwarrior

Cotransport of Na+ and glucose in the intestine, Na+/K+ pump, absorption of nutrients in cells

Ahhh yes those are good ones. Oops better go revise co-transport for the first time since this time last year...

Thank you :biggrin:

Reply 1542

bioevangelist

2

Original post by Bustamove

What temperature is it that we need to know for PCR? my book is telling me two different things! help? I saw somewhere earlier on the thread about knowing it by the nearest 0.1 degree?

You don't need to know exact temperatures. 95ºC approximately for DNA separation (or DNA denaturation). About 45 to 60ºC for annealing of primers (binding) and about 72ºC for extension of the primers by Taq DNA polymerase.

Reply 1543

TM96

8

Original post by Bustamove

What temperature is it that we need to know for PCR? my book is telling me two different things! help? I saw somewhere earlier on the thread about knowing it by the nearest 0.1 degree?

yeah i was joking about the whole 0.1 degree thing XD.. i think you need to know that the optimum temp for DNA Polymerase is 72degrees & that its thermostable i think initially its 95 degrees to separate the DNA strands but i could be wrong

Reply 1544

mck9777

2

Should we put a line through our essay plan?

Reply 1545

SamuelSingleton

13

Original post by charlottei

Guys please I need some examples of active transport?
My mind has gone completely blank...

Synapses? Muscles? What else?

water transport into xylem

Reply 1546

TM96

8

https://www.youtube.com/watch?v=JyERYkBvBNI
great banter i r8 8/8

Reply 1547

Bustamove

19

Original post by TM96

yeah i was joking about the whole 0.1 degree thing XD.. i think you need to know that the optimum temp for DNA Polymerase is 72degrees & that its thermostable i think initially its 95 degrees to separate the DNA strands but i could be wrong

Original post by bioevangelist

You don't need to know exact temperatures. 95ºC approximately for DNA separation (or DNA denaturation). About 45 to 60ºC for annealing of primers (binding) and about 72ºC for extension of the primers by Taq DNA polymerase.

Original post by adam_y23

95 to 52 to 77The guy was joking

Ah LOL
Thanks guys :smile:

Reply 1548

DecantedOrange

3

Original post by mck9777

Should we put a line through our essay plan?

No

Reply 1549

bioevangelist

2

Original post by charlottei

Guys please I need some examples of active transport?
My mind has gone completely blank...

Synapses? Muscles? What else?

Ions into root hair cells and into the xylem. Possible active transport of auxins from one side of a shoot to the other (although debatable). Na / K pump in neurones and in gut epithelial cells. Active transport of pyruvate into mitochondria. There's a few....

Reply 1550

kiwi8397

7

Original post by mck9777

Should we put a line through our essay plan?

no no no they apparently might refer to this to mark

Reply 1551

ember8

2

Original post by bioevangelist

So long as you talk about H+ ions and HCO3- ions when carbonic acid dissociates in water. Kidney is not on AQA spec.

im trying to do an ions essay, what else can be included? as in from unit 1 and 2

Reply 1552

Nchomuzinda

2

Someone sold the biol5 paper yesterday on eBay for £305

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Reply 1553

Bethany_

2

Original post by Nchomuzinda

Someone sold the biol5 paper yesterday on eBay for £305

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I'd rather fail then waste £305 on a biology A level

Reply 1554

Cpie21

3

Can anyone explain the effect of oestrogen on gene transcription??

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Reply 1555

MrPolish

2

aight lets hope the paper will be nice including the essay >.<

Reply 1556

Yaz97

2

Original post by ember8

im trying to do an ions essay, what else can be included? as in from unit 1 and 2

My basic plan is:
Transport in plants
Nitrogen cycle
Proteins - Fe2+ group in haemoglobin and ionic bonds in tertiary structures
Synapses
Ca2+ in muscle contraction
Cl- in cholera
Sodium potassium pump in gut/axon
H+ in ETC and in regulating blood pH
Pi in ATP and DNA

Hope that helps!

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