1. There are many causes: Damage to the surrounding tissue, cross linking of bound antibodies (an allergic response), it can also be released by some medicine (including morphine and some antibiotics - but we don't need to know this)
2. We don't need to know the specifics for VCE so I don't know but Vox can probably tell you?
3. Percentage change is more accurate as all the samples may not be exactly the same at the start of the experiment. Eg. Doing an experiment on osmosis by measuring the weight of potato strips - you are not likely to be able to get all of them exactly the same weight so % change is more accurate - otherwise the results do not take into account the difference in the original weight.
4. Unsure on this (I don't know any
- more things for me to revise)
5. Yes, so long as you write it out and put the abbreviation in brackets you can. - You can also use any they've abbreviated in the stem without writing it out in full.
6. Yep! They are definitely active transport - Generally anything that doesn't have diffusion in its name is active.
7. It is not inhibition as the repressor protein is not an enzyme - however it does bind to a different site, not the site that binds to the operator (as that site is bound to the operator when the lactose binds to it.)
Let me know if any of that doesn't make sense