Higher Biology 2013

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On multiple choice question there was a question which asked what would happen to the conc. of RuBP and GP if the availability of CO2 decreased? I said RuBP would decrease and GP would increase as this was the answer to the same question in a past paper but I am unsure If its correct, what did u guys put??

Reply 381

Nessie162

RuBP would accumulate, GP would decrease... That's what I got.
Although I'm not sure if it's right either

Reply 382

JackoGeddes

yep didn't CO2 decrease?

so less RUBP would be able to be made into GP, while GP was still being made into RUBP so GP = Decrease and RUBP accumulates

Reply 383

JackoGeddes

I know its been asked a million times, but does anyone at all have access to the paper? driving myself up the wall

Reply 384

lyndsaaayyy

Christ, Looking at the answers on this I've barely scraped a D.

Reply 385

lovechemistry

The answer to that multiple choice question about RuBP and Gp was D , RuBp increase and Gp decrease

Reply 386

rich7gers

Original post by JackoGeddes

weird question, had an answer along those lines. something like it had been split up by human blood clotting gene and wouldn't be coded for

Thabks, saying that the gene was switched off has put me in doubt

Reply 387

JackoGeddes

Can anyone remember the question on marman grasses or something? I hate how they had to overcomplicate everything.

anyway, for that question it asked why it was good the leaves uncurled when it was moist in the second bit

I said something about It would be able to increase uptake of CO2 for increased photosynthesis as RUBP requires co2 to make GP in the calvin cycle

Reply 388

rc16

Original post by JackoGeddes

I said a greater surface area was exposed to absorb light for photosynthesis

This was posted from The Student Room's iPhone/iPad App

Reply 389

CSM1996

Original post by JackoGeddes

I said increased surface water to maximise water uptake for photosynthesis. Which is different to you and the person above :lol:

Reply 390

JackoGeddes

I remember in one of the past papers the disadvantage of xerophytes in that they have few stomata rolled leaves etc was a reduced co2 uptake, but your water absorption one sounds about right. hmm, bloody worse paper in the world.. was sure i'd get an A and now I feel on the edge of a B, do you think they'll lower it a deal?

Reply 391

rc16

Yeah it said the advantage of it being curled which was decreased air movements and increased humidity decreases transpiration rate but the second bit said whats the advantage for photosynthesis when they uncurl in moist conditions so if it's photosynthesis it can probably either be light/co2

This was posted from The Student Room's iPhone/iPad App

Reply 392

JackoGeddes

Original post by rc16

thats good, the first bit i wrote reduced air movements caused reduced wind spind causing reduced transpiration so I should get the marks, hopefully in the other bit too.

god i hope they drop the marks a bit! think a B is safe though.

Reply 393

CSM1996

Original post by rc16

In geography (cross curricular init) we learned that plants curl their leaves to reduce water loss. God knows how right it is in biology but we also got taught it in biology so meh. I think that can be an answer to part a as well.

Reply 394

AviG123

What was the answer to the allele question. I put RR at the top, bb at the bottom. And then rr at the top of the other side and BB below.

Reply 395

rich7gers

Could you not argue that curling of leaves reduces the surface area of the leaf exposed to sunlight etc and this would also reduce the transpiration rate

Reply 396

CSM1996

Original post by rich7gers

Could you not argue that curling of leaves reduces the surface area of the leaf exposed to sunlight etc and this would also reduce the transpiration rate