RESPIRATION - AQA A LEVEL BIOLOGY + EXAM QUESTION RUN THROUGH
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- Опубліковано 20 сер 2020
- In this video, I explain ALL of the content required for the "Respiration" section of AQA A Level Biology. This includes: glycolysis, link reaction, Krebs cycle and oxidative phosphorylation. Time stamps are in the comments section. The content in this video crosses over with other exam boards too!
I also go through a few exam questions and explain the mark schemes.
Please comment if you have any questions, I'll be more than happy to answer them!! :)
also, the triose phosphate produced by the phosphorylation of glycerol, wouldn't it enter glycolysis and not Krebs cycle?
Yes you're right - it would enter glycolysis!!!!! I'll pin this comment
Such a stupid error - sorry about that. Even I get things wrong sometimes! 😭
@@AlevelBiologyHelp then does this mean the carbon compound also enters glycolysis ?
Watching these videos hours before my end of topic tests and still getting As is a blessing
Thank you so much for this video. My book complicates everything so much, this video was extremely easy to understand and I understand the topic really well right now thanks to you!
this is unbelievably helpful. i’m failing miserably at the moment. i really feel much better for my test this afternoon. thank you!
Aw thank you! Best of luck in your test, let me know how it goes!
Thank you so much for this video! It was really helpful :)
00:52 = Glycolysis
03:50 = Anaerobic respiration (fermentation)
04:52 = Link reaction + Krebs Cycle
10:17 = Lipids and amino acids can be used in respiration
11:24 = Oxidative Phosphorylation
15:06 = Exam questions and mark schemes
Tysmmmmm💕💕💕💕 you are a blessing
Great video 👍
I’m struggling to understand this chapter but this has helped thank you :)
It is very difficult! Glad I could help. :)
Thank you for including the exam questions - i have an exam in 10 minutes and this helped me out very much!
How did the exam go?
your videos help me a lot thank you for making them
You're so welcome!
Amazing explanations
this video was great and helped me to get an A
Massive congratulations! Well done x
Why does the volume remain constant in the question at 25:28 ? Surely the same amount of oxygen wouldn't be taken up since one is aerobic and one is anaerobic?
Hi! The mark scheme is quite confusing for this one, but what it's saying is that because the yeast is now respiring aerobically, the volume of oxygen taken up and the volume of carbon dioxide is now equivalent so the total volume of gas in the syringe remains the same. I hope this makes sense :)
Is this everything we need to know on the spec or are there any gaps ❣️
Hi, this is everything you need to know!
When did you do your A levels?
June 2019 :) so a couple of years ago
I thought NADP was reduced NAD, but the video stated that glycolysis produced 2x NADH. Does that mean NADP and NADH are the same? I though NADH was just normal NAD?
Hi! NADP and NADH are not the same. NADP (used mainly in photosynthesis) is NAD with a phosphate attached to it. NADH is reduced NAD (hence the extra hydrogen suggesting a reduction). Hope this makes sense :)
@@AlevelBiologyHelp thank you! That helps a lot. I tried to find the answer online but it wasn't as clear!
for oxidative phosphorylation- would it not be 2NADH that is used?
Technically, 10NADH are used in oxidative phosphorylation, but at A level, you don't really have to know the exact numbers, just that NADH is used. It's good to know though 😁
@@AlevelBiologyHelp 10NADH?? damn.
@@cait3 Yep! Two from glycolysis, two from the link reaction, and six from the Krebs cycle!!
hello, can I ask if you need to know how many carbon atoms that each molecule contains? e.g. pyruvate (3C), thus 3 carbon atoms
thanks :)
Yes you need to know that as it helps you to understand what is happening in the process :)
@@AlevelBiologyHelp thanks :)
at 4:59 is that meant to be the link reaction?
Yes
why link reaction and krebs cycle can't happen without oxygen?
Oxygen is the terminal electron acceptor in the electron transport chain, if the electrons aren’t taken up because there’s no oxygen then NADH and FADH2 can’t be oxidised and release their electrons
5:23
10:11
How come you didn't mention Hexose biphosphate?
Hi! I'm assuming you're on about glycolysis? For AQA, you don't need to know it in much detail at all (look at the specification). You just need to know that glucose is phosphorylated and is split into triose phosphate
@@AlevelBiologyHelp We had to know it was formed, and that it splits into the two triose phosphate molecules, but that was about it. Thanks for replying!
@@safandsound Yes I think it's better to learn it in a bit more detail than what the specification states to improve understanding :)
im in year 12, biology is easy for now but this is looking like a nightmare
This and respiration have probably been the worst so far
YOU HAVE TOO MANY ADS
Aw I'm sorry! I'm currently trying to go through my videos and reduce the number of ads :)