RESPIRATION - AQA A LEVEL BIOLOGY + EXAM QUESTION RUN THROUGH

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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!! :)

Опубликовано:

20 авг 2020

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Комментарии : 51

@seokjinkim9604 2 года назад

also, the triose phosphate produced by the phosphorylation of glycerol, wouldn't it enter glycolysis and not Krebs cycle?

@AlevelBiologyHelp 2 года назад

Yes you're right - it would enter glycolysis!!!!! I'll pin this comment

@AlevelBiologyHelp 2 года назад

Such a stupid error - sorry about that. Even I get things wrong sometimes! 😭

@yaz0318 Год назад

@@AlevelBiologyHelp then does this mean the carbon compound also enters glycolysis ?

@erinstewart2984 Год назад

Watching these videos hours before my end of topic tests and still getting As is a blessing

@goldielocks9092 3 года назад

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!

@taylorprice1440 2 года назад

this is unbelievably helpful. i’m failing miserably at the moment. i really feel much better for my test this afternoon. thank you!

@AlevelBiologyHelp 2 года назад

Aw thank you! Best of luck in your test, let me know how it goes!

@SH-bt3rw 3 года назад

Thank you so much for this video! It was really helpful :)

@AlevelBiologyHelp 4 года назад

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

@scitastic720 2 года назад

Tysmmmmm💕💕💕💕 you are a blessing

@dikiajoshua4586 Год назад

Amazing explanations

@jasminei4382 2 года назад

I’m struggling to understand this chapter but this has helped thank you :)

@AlevelBiologyHelp 2 года назад

It is very difficult! Glad I could help. :)

@mera9679 2 года назад

Thank you for including the exam questions - i have an exam in 10 minutes and this helped me out very much!

@AlevelBiologyHelp 2 года назад

How did the exam go?

@tanyaakthar9338 Год назад

Great video 👍

@lydiazanetti 2 года назад

your videos help me a lot thank you for making them

@AlevelBiologyHelp 2 года назад

You're so welcome!

@Farah-dc4bb 3 года назад

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?

@AlevelBiologyHelp 3 года назад

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 :)

@bk250 2 года назад

this video was great and helped me to get an A

@AlevelBiologyHelp 2 года назад

Massive congratulations! Well done x

@imogennnnn 3 года назад

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?

@AlevelBiologyHelp 3 года назад

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 :)

@imogennnnn 3 года назад

@@AlevelBiologyHelp thank you! That helps a lot. I tried to find the answer online but it wasn't as clear!

@cait3 3 года назад

for oxidative phosphorylation- would it not be 2NADH that is used?

@AlevelBiologyHelp 3 года назад

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 😁

@cait3 3 года назад

@@AlevelBiologyHelp 10NADH?? damn.

@AlevelBiologyHelp 3 года назад

@@cait3 Yep! Two from glycolysis, two from the link reaction, and six from the Krebs cycle!!

@seokjinkim9604 2 года назад

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 :)

@AlevelBiologyHelp 2 года назад

Yes you need to know that as it helps you to understand what is happening in the process :)

@seokjinkim9604 2 года назад

@@AlevelBiologyHelp thanks :)

@hillaryantwi9279 3 года назад

When did you do your A levels?

@AlevelBiologyHelp 3 года назад

June 2019 :) so a couple of years ago

@jasmin4518 2 года назад

at 4:59 is that meant to be the link reaction?

@AlevelBiologyHelp 2 года назад

Yes

@nilakshipravin989 Год назад

why link reaction and krebs cycle can't happen without oxygen?

@dominikprajzner2335 Год назад

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

@emmafive2647 2 года назад

Is this everything we need to know on the spec or are there any gaps ❣️

@AlevelBiologyHelp 2 года назад

Hi, this is everything you need to know!

@hoau1406 Год назад

5:23

@hoau1406 Год назад

10:11

@safandsound 3 года назад

How come you didn't mention Hexose biphosphate?

@AlevelBiologyHelp 3 года назад

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

@safandsound 3 года назад

@@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!

@AlevelBiologyHelp 3 года назад

@@safandsound Yes I think it's better to learn it in a bit more detail than what the specification states to improve understanding :)