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100 thoughts on “Steps of glycolysis | Cellular respiration | Biology | Khan Academy

  1. what happens to the H atom that gets replaced by a phosphate group in the first phosporylation step? (with the hexokinase) ? is it free? is this free H+ the reason why we feel our muscles burn while doing isometric exercices?

  2. I often hear Sal or other presenters make reference to other videos that they've already made that cover topics that come up in this video. Since I occasionally am just happening to come across thee vids while browsing Youtube, it would be helpful if they could provide links to the videos they're referencing. I'd after all like to watch those too, and it would save me some time from searching through Khan Academy's library.

    Just an idea.

  3. In step 4-5, F1, 6-BP breaks into DHAP and G3P, the DHAP is then converted to G3P. You don't end up with 2 G3P in one step.

  4. so it was

    Tuesday: well you've seen photosynthesis and the light reaction and Calvin cycle, I'm going to give you a pop quiz. you wont know when its going to be so it might be tomorrow 🙂
    nah just kidding.
    not tomorrow cause you have two more cycles I have to go over with you which is Krebs and glycolysis.

    Wednesday; k so do the math..your lab is due next Friday. your exams are wed and Thursday..i cant give you the pop quiz on Tuesday because I need you do study and focus on what's important. Why would I give you a quiz on Monday..
    oh yeah.
    no school Friday.

    so our test was going to be today, Thursday.
    band nerds got pissed cause they didn't get home till later on
    emails were sent.
    I didn't even prepare, and I'm not in band I just didn't prepare.
    teacher got pissed and said wtv were doing it Monday.

    death 🙂

  5. these processes are so fun!! It actually feels so much better to know the mechanisms behind them rather than just memorizing the names.

  6. What about the Triose Phosphate isomerase that keeps both molecules (after alodase catalyzes fructose to basically split in half) as Glyceraldehyde (wanted 1st isomer) and not Dihydroxyacetone Phosphate (unwanted 2nd isomer)?

  7. Magnesium shows up 6 times when converting glucose to pyruvate, and another 6 times in the Krebs cycle and Oxidative phosphorylation, so out of those 22 steps to make our ATP, magnesium is needed in 12 of those steps. Funny how Magnesium is #12 on the periodic table, and it's greatest phosphorylating secret how it converts sunlight into chlorophyll, the blood of the plant.

  8. Is there a video of cellular respiration using fructose or sucrose? I need to know it and can't find a video anywhere! Please help

  9. I think it’s cruel that the A.P. Bio, 12u bio curriculum requires us to memorize the steps of glycolysis. Although, I do appreciate the complex process that allows us to break down sugar from food and convert into the universal energy currency, ATP.

  10. Dope video, I love how you actually enjoy what you're talking about and are enthusiastic about it!

  11. i think sal can explain this in much better way…..as like in his previous videos….but,this video is not satisfying sal…sorry !!!! anyhow you are greater than many professors of my college…i have learnt so much from khan academy…thats it…thanq

  12. Thank you so much. A wonderful review for SAT subject test for which I am preparing even though College Board requires me to know much less about Glycolysis than what this video taught me.

  13. imagine being bilingual in which English isn't your native language, and now having to translate the whole video by yourself :')

  14. does anyone know where the 2 adp comes from at 10:14 for it to happen twice? lmao thats the only thing i dont understand

  15. hey, Mr. khan, Id really appreciate it if you could include printable versions of the notes that you write in the videos as a link in the video description.

  16. İ want to ask when there are two molecules of pgal each attached to a phosphate group how do they get the other two phosphate groups if they dont use 2 more atps!?

  17. I've taken chem 152, 200, and 201, and yet taking the intro bio class feels like i should've taken organic chemistry… why is organic chem not a pre req for bio 200….

  18. The magnesium coupled atp is to make sure as you break atp to adp you dont go throwing energy grenades all around the cell. So the magnesium is used to stabilize the phosphate offloading.

  19. Gotta learn this, the krebs cycle, etc and mitosis and meiosis for wensday. Gotta love a three chapter test

  20. "H-H-H-How all of these are discovered by the scientists?" well HOW I WISHED ALL OF THESE ARENT DISCOVERED BY THEM.

  21. I will always love biology the most. Chemistry, well, not so much. I mean it's quite an interesting subject but it makes me struggle so much at school. Same for Physics.

  22. We are so ungrateful sometimes for the opportunity we have to learn this in school.
    I still don't get it though.

  23. these videos would be much easier to understand if there werent any long words

    on the flip side, once you know all the long words and their meaning, you can flex

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