TalkGraphExplaining cellular respiration out loud
Biology revision: talking the topic through before the mock, without the textbook.
TOPICGlycolysis
The first stage, in the cytoplasm.
TOPICPriyaGlucose splits into two pyruvate
Happens without oxygen.
FACTPriyaNet gain of 2 ATP
4 made, 2 used to get it started.
FACTPriyaWhere does the NADH go?
I said it, but couldn't say what happens to it next.
QUESTIONPriyaKrebs cycle
In the mitochondrial matrix.
TOPICPriyaPyruvate becomes acetyl CoA first
The link reaction, and CO2 is released.
FACTPriyaOne turn per acetyl CoA
So two turns per glucose.
FACTPriyaStill shaky on what each turn produces
Mixed up the NADH and FADH2 counts.
QUESTIONPriyaRedraw the cycle from memory on Saturday
Then check it against the spec diagram.
ACTION☐ Priya @PriyaElectron transport chain
On the inner mitochondrial membrane.
TOPICPriyaOxygen is the final electron acceptor
That's why it needs oxygen at all.
FACTPriyaExplain it as a waterfall
Electrons falling down steps, the energy pumping protons up.
IDEAPriyaMost of the ATP is made here
Through ATP synthase.
FACTPriyaATP per glucose, by stage
Roughly, the numbers I need for the exam.
CHARTPriyaAnaerobic respiration
When there isn't enough oxygen.
TOPICPriyaLactate in animals, ethanol in yeast
Both regenerate NAD so glycolysis keeps going.
FACTPriyaWhy so much less ATP?
Came up in last year's paper.
QUESTIONPriyaGlycolysis and the chain are solid
Krebs is the gap. That's Saturday's focus.
DECISIONPriyaTwo past paper questions on Krebs
Timed, then mark them.
ACTION☐ Priya @Priya