REQUIRED PRACTICAL 1 (AS) - AQA A LEVEL BIOLOGY

[@AlevelBiologyHelp]

00:53 = Variables 01:52 = Background to trypsin 02:23 = Practical procedure 08:20 = Results 10:59 = Theory behind the experiment (enzymes) 12:28 = Exam question

[@starup5541]

could you do more practical videos like this because as you know due to the current situations practical work cannot be undertaken. Great video

[@heather-sj2pi]

thank you this is very helpful! honestly seeing it written is just as helpful as seeing it done as a practical in person

[@AlevelBiologyHelp]

In the last question, I said you don't need to use comparative words like "faster", but you in fact do, I just messed up my words!

[@Shaun.1]

Your explanations are on point I like how you explain even the smallest details really helpful

[@leahlester2620]

Wow thank you! This must have taken you ages! Very useful. Looking forward to the rest of the series😊

[@vliss4971]

thanks i have my practical tmr so this is very helpful

[@ramnikkaur8681]

Thank you very much for this video. It is very useful. Could you please make videos on practical 3,4,7,8 and 9? Thank you :)

[@gaanavmanyam9214]

At 17:42, How do you know its the substrate that has been used and not actual enzyme/active site?

[@AlevelBiologyHelp]

Hi! Enzymes don't get used up as they are catalysts, meaning that they're unchanged during a reaction. Substrates on the other hand are converted into a product, so they are used up. :)

[@sakinahkhadbi8658]

Is the control done only once? Also, for doing 3 tried per experiment, is it ok to do 3 at the same temperature together? As in, warm them in the same water bath and time them together.

[@hussaink-c7v]

Is the procedure the exact same for different independent variables?

[@AlevelBiologyHelp]

Yep ;)

[@surpremier]

this is so helpful! thank you!

[@AlevelBiologyHelp]

You're welcome ☺️

[@Buffalobites]

can you not say that all the enzymes active sites have been saturated instead of all substrates are used up how would i know which to use??????

[@Buffalobites]

do i just assume its the substrate

[@AlevelBiologyHelp]

I think you have to say that all substrates are used up because the dependent variable here is the concentration of product which relates to the substrate more as substrates are converted to the product in enzyme reactions.

[@samsonyonathan5246]

thank you so much this , video was so well explained and really helpful !!!!!!!1

[@maryjane1486]

Thank you for this!