18 Comments

  1. When we are breaking the ATP we are getting ADP and HPO3 then, when ATP has to form then where does that phosphate come from?

    A HPO3 molecule can never again bind with a free ADP to reform ATP, right??

  2. The Professor needs to go back to his textbook! The Gibbs free energy for ATP hydrolysis depends on the concentrations of ATP, ADP and Pi (and other variables like ion concentrations, temperature) and is typically about 60 kJ/mol under cellular conditions. The stated value of 30.5 kJ/mol is the "standard Gibbs free energy" when [ATP] = [ADP] = [Pi] = 1 Molar (non-physiological and probably well beyond the solubilities). This is a common mistake. The lesson to students – don't believe everything you read or hear.

  3. I've watched a lot of stuff about cellular respiration and I still don't get what's meant when people talk about "energy". Is it for instance molecules becoming a higher thermodynamic state when they become phosphorylated or something?

  4. I see two hydrogen atoms in the water molecule but only one hydrogen after the reaction. What happens to the other hydrogen atom?

  5. Of course it's my pleasure to get to know about this laudable effort of those who maintain this you tube channel to impart students the knowledge they opt for.

  6. It s weird.
    It is repetitive sometime there s subtitles,
    other time there no subtitle on Youtube.
    Does anyone know how to solve on the phone?

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