Does anyone know of any online sites that do interactive tests? And can anyone do bullet points for the enzyme core practical I just can't get my head around it. Thanks
For the enzyme practical: - Caesin (cloudy) can be broken down into amino acid (clear) by trypisn - Make up 5 different trypsin concentrations eg 0,0.2,0.4,0.6,0.8,1 [Independent Variable] -Add a fixed volume of trypsin to a fixed volume of casein -Use a colorimeter and take absorbance readings every minute for say 5 minutes [Dependent Variable] -Repeat three times at each concentration then repeat the whole experiment again -Note down results and plot a graph Things to be kept constant: -Temperature - Keep colorimeter filter the same -Ph -Concentration and volume of caesin -Volume of trypsin
hi,has anyone solved the 2013 paper? if yes can someone explain to me why in q3 part b(i) we shouldnt talk about osmosis? cause in the mark scheme it says NOT osmosis
hi,has anyone solved the 2013 paper? if yes can someone explain to me why in q3 part b(i) we shouldnt talk about osmosis? cause in the mark scheme it says NOT osmosis
I did this exam in Jan
Basically, notice the question was talking about the movement of a solute. Osmosis is the transport of free water molecules from areas of high concentration to low concentrations, therefore, the solute wasn't travelling by osmosis, as it isn't water.
why does obesity increase the risk of cvd?? I know it sounds simple but that's one of those awkward questions that i know id lose marks for
Obesity is a consequence of a bad diet and an inactive lifestyle. A bad diet would include things such as saturated fats and high cholesterol, which increases the blood pressure which increases the chance of an atheroma forming due to the artery wall being ruptured. An atheroma would clog the arteries and lead to a plaque forming and therefore a high risk of CVD. An inactive lifestyle also increases blood pressure
Im guessing tomorrow is going to be a rather difficult paper since January 2013 was pretty simple... Any of your teachers gave expected questions or such? ANYTHING would help
Im guessing tomorrow is going to be a rather difficult paper since January 2013 was pretty simple... Any of your teachers gave expected questions or such? ANYTHING would help
I agree! And my teacher said he expects gene therapy to come up again as it's been answered poorly so many times and so they'll continue to ask it until it's answered well. Maybe cystic fibrosis too?
Basically, notice the question was talking about the movement of a solute. Osmosis is the transport of free water molecules from areas of high concentration to low concentrations, therefore, the solute wasn't travelling by osmosis, as it isn't water.
I agree! And my teacher said he expects gene therapy to come up again as it's been answered poorly so many times and so they'll continue to ask it until it's answered well. Maybe cystic fibrosis too?
Hi guys, do you guys have any general tips for how to remember the information for tomorrow, in particular does anyone know of a good revision source for videos as i'm finding it really hard to get my head round certain topics like replication and transcription. All answers appreciated. Many thanks and good luck!