AQA A2 Biology BIOL5 - 17th June 2015

I did the same! My teacher said thats fine as long as its scientifically accurate showing well developed understanding in that topic. Enough for 12/16 for scientific content. Plus the 3/3 for breadth

How about if you only focused on internal responses like the immune system, blood glucose, haemoglobin & blood ph in detail? Would you lose marks?

Yeah I guess because it did say explain responses to change in the external environment too Id say maybe a breadth and couple of scientific content marks dropped?

Ah I thought so I had a brain freeze and then ran out of time, how many marks do you think would be lost?

I wrote essay 10A andbi wrote about lung function and tissue fluid is that relevant

Did anyone understand the last question about the graph with the resistant and non-resistance plants? To me it seemed like they were meant to put non-resistant with the enzyme instead of resistant with the enzyme,it made me so confused

For the essay question 10a, I wrote about adaption and speciation as well as pests. Is that irrelevent or would i get marks for that

I wrote about that too - seems relevant, as long as you linked it back to the question

I attempted question 10a and I'm freaking out I'm so worried!!!!I spoke about mostly thermoregulation; how thermoreceptors detect high temperatures and that controlling of an internal environment is integral to avoid denaturing of essential enzymes such as dehydrogenase which oxadises triosephosphate in glycolysis for synthesis of ATP.I also said in times of high heat, due to this importance of a maintained body temperature, the body releases sweat so heat from skin is conducted. But then I went into LOADS of detail about how the body heats itself up in response to cold temperatures. I basically outlined every philosogical change that occurs to make someone "shiver". I spent ages talking about THE ENTIRE process:

- thermoreceptors detecting low temp in external environment• stimulates heating center of hypothalamus

- increases the amount of action potentials in autonomic nervous system• outlined the transmission of an action potential (sodium ions and each stage in polarisation)

- how in order for this nerve impulse to be transmitted, ATP is needed for sodium potassium pumo to actively tansport sodium outside the membrane such depolation can occur.

- ATP production is dependant on emzymes not being denatured in response to heat and having enough kimetic emergy to move to intermembrame space in chemoosmotic theory, where ATP is produced via diffusion of protons down ATPSynthase. Energy for movement of protons comes from the photons released as result of redox reactions when electrons move to subsequently lower energy stattes in oxidative phisphorilisation.

- how this then leads to exocytosis of vesicles containing acetylcholine in neuromuscular junctions

- increased temporal summatiom so threshold is more quickly achieved• therefore more changing in 3D shape of post synaptic receptors so more influx of sodium ions in t tube and thus more release of calcium ions from the sarcoplasmic rectillium to bind to troponin.

- therefore myosin heads bind at a higher rate to actin filament and more power strokes/cross bridges occur.

- Therefore shivering is a result of low temperatures and creates friction to increase the internal temoerature to 37°C.I know there's a lot in this process, but I'm worried to death because I'm only talking about ONE process (shivering).

I also mentioned about temperature avoiding enzyme denaturation, and I spoke at the end about the suprachiasmatic nucleus (SCN) stimulating pineal gland to release melatonin to induce sleep in response to low light.I feel like I have talked WAY too much about one topic, instead of covering 4-5 areas in less detail. I am SO WORRIED!!!How badly will my mark be affected by doing this??? someone please reply

Hi! I thought the paper was ok considering my minimal revision, I did essay A for which i wrote about:

Homeostasis principle
Thermoreg
Enzymes
Blood pH -> chemoreceptors
Baroreceptors, pressure, bio basis of heart disease
Immune Response
Stomata/Plants, photosynthesis, plant tropisms
ATP formation in anae respiration
Muscle contraction
Natural selection/Adaptation

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