AQA A2 Biology BIOL5 - 17th June 2015

whichever ones have topics you find difficult and practise them, then memorise what the markscheme looks for in those ones so you know what answers theyr elooking for
skim over the rest, dont even bother writing down the 1/2 markers just do it in your head and check the answer

this is a stupid question but are enzymes proteins? LOL

****, my mind is just completely blank after C4... I hate exams on consecutive days..

this is a stupid question but are enzymes proteins? LOL

****, my mind is just completely blank after C4... I hate exams on consecutive days..

this is a stupid question but are enzymes proteins? LOL

****, my mind is just completely blank after C4... I hate exams on consecutive days..

Yes, proteins with a specific shape (active site). C4 was horrible I don't blame you...

Hi, thanks for these enzymes theyre very useful. I have one question about the myosin ATPase- (I always get the sliding filament theory wrong) I believed that the myosin head attaches to the actin binding site and releases an ADP. I know this sounds stupid but the diagram in the book (by the Tooles) confuses me because it shows initially the myosin head having an ADP attached, then joins to the actin and releases this ADP, where does this myosin ATPase fit in with the model, I really would love some advice. Thanks

It is really

lipid soluble molecules being able to diffuse into the membranes of cells eg oestrogen perhaps?
digestion of lipids eg lipases
could maybe talk about CHD?
for something off the spec i'd prob talk about how lipids can be made by reacting glycerol with a triester or something for the structure but that's very chemistry based.

are adenyl cyclase and adenylate cyclase the same thing?

Believe it or not unfavourable environment does lead to more turning, I don't understand it either, but google klinokinesis

Do both the follicle and the ovaries produce oestrogen, also do both corpus luteum and ovaries produce progesterone?