I found the how science works questions the hardest, like question 6.a.ii on how the student should calculate the rate of anaerobic respiration. I got a mark for saying “the volume of gas used” however I wouldn't have thought about the mass of the woodlouse or the cross sectional area for the second two marks.
I also found the question about the mitochondria in the isotonic solution hard, and though I understand the answer, again, I don’t I would have thought about writing that myself.
I would like to go over application of the respiration knowledge to specific examples. I think I know the content well, but the way the exam questions were applied to examples made it hard to know what to write . I also need to work on making my answers shorter (!) and getting to the point faster, as not to waste time.
Katherine, I agree with your comments about question 6aii. In my answer, I too got a mark for the volume, but, I then continued by waffling on about repeating her measurements to make them reliable etc. and then how to work out the rate per gram per hour.
For the mitochondria question, as a rule of thumb one mark questions about "why was the solution....isotonic" are usually about preventing damage to organelles (as in the case of the mitochondria) due to osmosis which would cause shrinking or bursting, as the water moves in/out. For the next part, remember a mitochondria is a very small organelle so a large glucose can not enter it until it has been broken down via the process of glycolysis (which takes place in the cytoplasm), into pyruvate.
Lastly, I think I too would like to try some respiration application questions!
I got a bit confused with some of the biology application questions- especially Q 5.d. I also struggled on Q 6.a. i and ii. For i) I mentioned that oxygen was taken up by the woodlouse, but forgot to say carbon dioxide is released, and did not state that this would increase the pressure. For ii) I mentioned distance and time, but did not realise that the mass of the woodlouse and the cross-section of the tubing should be measured. I am not sure why the cross- section and mass need to be measured- can anyone explain this to me?
I also lost marks on the questions focused on the Electron Transport Chain. I neglected to mention ATP synthase and the reaction by which ATP is formed .
I think doing some respiration application questions is a great idea!
The questions i most struggled on were the how science work questions - 6a+b. also the other question 6a+b(i)(iii) about membrane. i also lost marks on the question 5(d). I just need more practice by doing more exam and application questions.
I found the how science works questions the hardest, like question 6.a.ii on how the student should calculate the rate of anaerobic respiration. I got a mark for saying “the volume of gas used” however I wouldn't have thought about the mass of the woodlouse or the cross sectional area for the second two marks.
ReplyDeleteI also found the question about the mitochondria in the isotonic solution hard, and though I understand the answer, again, I don’t I would have thought about writing that myself.
I would like to go over application of the respiration knowledge to specific examples. I think I know the content well, but the way the exam questions were applied to examples made it hard to know what to write . I also need to work on making my answers shorter (!) and getting to the point faster, as not to waste time.
Katherine, I agree with your comments about question 6aii. In my answer, I too got a mark for the volume, but, I then continued by waffling on about repeating her measurements to make them reliable etc. and then how to work out the rate per gram per hour.
ReplyDeleteFor the mitochondria question, as a rule of thumb one mark questions about "why was the solution....isotonic" are usually about preventing damage to organelles (as in the case of the mitochondria) due to osmosis which would cause shrinking or bursting, as the water moves in/out. For the next part, remember a mitochondria is a very small organelle so a large glucose can not enter it until it has been broken down via the process of glycolysis (which takes place in the cytoplasm), into pyruvate.
Lastly, I think I too would like to try some respiration application questions!
I got a bit confused with some of the biology application questions- especially Q 5.d. I also struggled on Q 6.a. i and ii. For i) I mentioned that oxygen was taken up by the woodlouse, but forgot to say carbon dioxide is released, and did not state that this would increase the pressure. For ii) I mentioned distance and time, but did not realise that the mass of the woodlouse and the cross-section of the tubing should be measured. I am not sure why the cross- section and mass need to be measured- can anyone explain this to me?
ReplyDeleteI also lost marks on the questions focused on the Electron Transport Chain. I neglected to mention ATP synthase and the reaction by which ATP is formed .
I think doing some respiration application questions is a great idea!
The questions i most struggled on were the how science work questions - 6a+b. also the other question 6a+b(i)(iii) about membrane. i also lost marks on the question 5(d).
ReplyDeleteI just need more practice by doing more exam and application questions.