Higher Biology 2013

What did people write for the yeast question where it said why was there still gas given off at oxygen conc of 0 ???? I put because oxygen was still present which is very wrong I think the answer might be because The reaction was still proceeding??

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Anaerobic respiration produced carbon dioxide even without oxygen

I can't forgive myself for forgetting this... I'm so gutted.
Was it worth 1 or 2 marks?

See the phototropism what was the advantage? Also was IAA the answer to the last part of te question?

do you get penalised in the essays for writing loads of maybe valid points?

I think for the first essay on pigments and light dependant I wrote like 10 for the first, just anything I could think of. think this was generally it;

light energy needed for photolysis
pigments contain chlorophyll
found in grana of chloroplast
primary and secondary pigments - chlorophyll a primary, chlorophyll b secondary
primary absorb red/blue
secondary pigments used for absorbing wider range of wavelengths of light

light stage:

Occurs in grana of chloroplasts
photolysis splits water into hydrogen and oxygen
oxygen bi-product
hydrogen carried by NADP to be used in calvin cycle
ATP is produced (ADP+PI>ATP)
temperature dependant

i was aware i repeated myself a bit, what do you guys think?

The plant grows to face the sunlight, increasing its ability to photosynthesise.

I was surprised that was just a 2 mark question - it's featured in essays before for either 4 or 6 marks (can't remember which, probably 4).

I just remembered "ROSE" from a study book I had (regulator, operator, structural, enzyme) and talked about how the repressor molecules cannot bind to the operator because of lactose, the inducer. Thus the operator turns the structural gene on and the structural gene produces beta-galactosidase which then breaks down the lactose. Repressor molecules can the bind to the operator, turning off the structural gene and production of beta-galactosidase. (Fitting all that in was a challenge).

would I get the mark for saying 'lets the plant curve towards light source for photosynthesis thus growth'?

What was the answer to what was the advantage to why beta-galactosidase was not produced by E-coli. Can't find it anywhere

yeah that's what I wrote but since it was so long I panicked a bit. ps (rose) how to pass higher biology? great book haha!


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What was the answer to what was the advantage to why beta-galactosidase was not produced by E-coli. Can't find it anywhere

I said because it saves energy and resources


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Was IAA an answer to any of the questions

One last question guys, what do you think in the genetic engineering question on why the person would still not be immune to the diease, do you think if I said because the blood-clotting gene replaced the majority of the original gene and this switched the gene off, would get me the 2 marks? Thanks again