Lecture transcription
Transcribe lectures with the lecturer and the students' questions labeled and every word timed. Make a summary, a quiz and flashcards from the same recording.
- Free transcribes the first 15 min of each file, no card
- 99+ languages, detected automatically
How cells make energy · 1:18:40 2 speakers
Transcript
- 40:58Dr. Hale
The complexes pump protons out of the matrix, so they pile up between the two membranes.
- 41:05Student
If oxygen isn't part of the Krebs cycle, why does the cell need it at all?
- 41:12Dr. Hale
So the question is why the cell needs oxygen at all. It waits at the very end of the chain, takes the electrons and joins with protons to make water.
Summary
The electron transport chain pumps protons out of the matrix, and oxygen takes the electrons at its end, forming water. 41:12
Overview
Dr. Hale follows one glucose molecule through cellular respiration, from the cytoplasm into the mitochondria, to show where the cell's ATP comes from. 1:10
Key points 5
The electron transport chain pumps protons out of the matrix, and oxygen takes the electrons at its end, forming water. 41:12
Questions 10
Take this quiz on your iPhone
1Why does the cell need oxygen in cellular respiration?
- To split glucose in glycolysis
- To take electrons at the end of the chain, Correct answer
- To carry protons through ATP synthase
- To release carbon dioxide
Correct answer: To take electrons at the end of the chain
Cards 20
Study these cards on your iPhone
Front
What happens to the electron transport chain without oxygen?
Back
It backs up and stops, because the electrons have nowhere to go.
Front
Where in the cell does glycolysis take place?
Back
In the cytoplasm
How to transcribe a lecture
1 Record or upload it
Record in your browser or the iPhone app, upload a file, or paste the lecture's YouTube or Vimeo link.
2 Speakers and course terms
The lecturer and each student who asks a question get a label. Add the course's terms first so they come out right.
3 Make a summary, quiz and flashcards
Each uses one generation, on every plan. A summary can show the time of every point, to check against the lecture.
4 Study on your iPhone
Take the quiz and study the cards with spaced repetition.
Check the summary against the lecture
Turn on “Include timestamps”, and each key point ends with the moment it came from.
How cells make energy · 1:18:40 2 speakers
Transcript
- 40:58
Dr. HaleThe complexes pump protons out of the matrix, so they pile up between the two membranes.
- 41:05
StudentIf oxygen isn't part of the Krebs cycle, why does the cell need it at all?
- 41:12
Dr. HaleSo the question is why the cell needs oxygen at all. It waits at the very end of the chain, takes the electrons and joins with protons to make water.
Summary
How cells make energy
Overview
Dr. Hale follows one glucose molecule through cellular respiration, from the cytoplasm into the mitochondria, to show where the cell's ATP comes from. 1:10
Key points 5
Glycolysis splits glucose into two pyruvate in the cytoplasm, for a net gain of 2 ATP, with no oxygen needed. 6:30
In the mitochondrial matrix, the Krebs cycle breaks the acetyl groups made from pyruvate down to carbon dioxide and loads their electrons onto NADH and FADH2. 18:45
The electron transport chain pumps protons out of the matrix, and oxygen takes the electrons at its end, forming water. 41:12
As the protons flow back through ATP synthase, it makes most of the cell's ATP, about 30 per glucose. 47:30
Without oxygen, cells fall back on fermentation and keep only the 2 ATP from glycolysis. 1:03:18
A quiz from the lecture, every answer explained
Make a quiz of 5 to 20 questions, multiple choice or true or false.
Quiz
How cells make energy
How cells make energy · 1:18:40
Made with: Questions: 10, Medium, Multiple choice
Take this quiz on your iPhone
The app scores each answer, shows the explanation, and keeps your results. The web shows the answer key, which you can edit and share.
Questions 10
1Why does the cell need oxygen in cellular respiration?
- To split glucose in glycolysis
- To take electrons at the end of the chain
- To carry protons through ATP synthase
- To release carbon dioxide
Show answerHide answer
Correct answer: To take electrons at the end of the chain
It's the last stop for the electrons, and it joins with protons to make water.
2Where in the cell does glycolysis take place?
- In the mitochondrial matrix
- In the cytoplasm
- On the inner mitochondrial membrane
- In the nucleus
Show answerHide answer
Correct answer: In the cytoplasm
Glycolysis runs in the cytoplasm and needs no oxygen. It splits one glucose into two pyruvate, for a net gain of 2 ATP.
3What does the Krebs cycle pass on to the electron transport chain?
- Glucose
- Oxygen
- Electrons carried by NADH and FADH2
- Water
Show answerHide answer
Correct answer: Electrons carried by NADH and FADH2
The cycle breaks the acetyl groups made from pyruvate down to carbon dioxide and loads their electrons onto NADH and FADH2, which carry them to the chain.
Free transcribes the first 15 min of each file, 30 min a month, no card.
The lecturer and the questions from the room
Each voice arrives as Speaker 1, Speaker 2 and so on. Rename the lecturer's label once, and every paragraph and every export follows, so a student's question stands out.
- Set the count before you transcribe, or leave it on auto.
- Rename in each lecture. PrismaScribe doesn't remember voices from one lecture to the next.
The complexes pump protons out of the matrix, so they pile up between the two membranes.
Course terms spelled right
Before you transcribe, add the course's terms and names, up to 1,000 of them. Custom vocabulary counts as 1.25× the minutes.
- Save a list per course and reuse it for every lecture.
- Ready-made term packs in English, among them biology and chemistry.
- Check a term by ear: click it to hear that moment.
Keyterms
- ATP synthase
- oxidative phosphorylation
- Krebs cycle
- FADH2
Add keyterms...Saved lists
Dr. HaleNow the protons flow back into the matrix through ATP synthase, and that flow makes ATP. We call this oxidative phosphorylation, and it gives the cell most of its ATP.
Record on your iPhone, study on the bus
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- Spaced repetition. The cards you miss come back sooner.
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Everything else you can do with a lecture
Bring the lecture in, work in the transcript, and export it for your course if you teach.
Get the lecture in
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Work in the transcript
- Find in transcriptFind every time a term came up in this lecture.
- AskAsk what the lecturer said about the exam and jump to the moment.
- ExplainGet a sentence you didn't follow explained, simpler or with an example.
- Notes and bookmarksMark passages for revision with a bookmark or your own note.
If you teach
- CaptionsSRT or VTT for the lecture video, with your own line length and timing.
- TranslationInto 99+ languages, side by side or as translated subtitles.
- DocumentsWord, PDF, Markdown or TXT for the course page.
Lecture in English, study in your own language
Read the transcript side by side in your language, and make the summary, quiz or flashcards in it too.
- Detection
- 99+ languages, automatic
- Output language
- Summary, quiz and flashcards
Read about multilingual transcription and how to translate audio.
Los complejos bombean protones fuera de la matriz, así que se acumulan entre las dos membranas.
Si el oxígeno no forma parte del ciclo de Krebs, ¿para qué lo necesita la célula?
Plans and prices
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20 hr a month, files up to 5 hr
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40 hr a month, files up to 8 hr 20 min
- Monthly
- $40 a month
- Yearly
- $300 a year, Save 38%$25 a month, billed once a year
Good to know
- Custom vocabulary, term packs, background noise removal, Explain and live transcription on iPhone need a paid plan.
- Free transcribes the first 15 min of each file, 15 min a day: a longer upload on the web becomes a preview, and the browser and iPhone recorders stop at 15 min.
- Background noise removal takes files up to 60 min and 500 MB, so not a 90‑minute lecture, and counts as 2× the minutes.
- You take quizzes and study flashcards on iPhone. The web shows the answer key and both sides of every card.
Your lectures stay private
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Lecture transcription FAQ
More questions? Write to hello@prismascribe.ai.
How do I transcribe a lecture?
Upload the lecture recording, record it on your iPhone, or paste the lecture's YouTube or Vimeo link. Say how many people speak and choose whether to keep every um or switch on No verbatim to leave them out. The transcript is usually ready a few minutes after you upload, and we email you.
Can a chat assistant transcribe a lecture?
Some can, for subscribers. One popular assistant takes audio files up to 512 MB, but not on its free plan, and its help center says very long recordings may time out and speaker identification may be unreliable (checked 11 October 2026). PrismaScribe gives the lecturer and the students who ask questions their own labels, and times every word.
Can it tell the lecturer apart from the students?
Yes. The lecturer and each student who asks a question get their own label, up to 32 voices. They arrive as Speaker 1, Speaker 2 and so on; rename each once per lecture. A question from the back of a big hall may be too quiet to pick up.
How long can a lecture be?
Up to 5 hr on Starter and Premium, and 8 hr 20 min on Pro, so a 90‑minute lecture fits all three. Free transcribes the first 15 min of each file. For a long video lecture, upload just the audio: files go up to 2 GB on Starter and Premium, and 5 GB on Pro.
Can I see the words on screen during the lecture?
Yes, on iPhone: the app can show the words as you record. Pick the lecture's language first, since live transcription doesn't work with automatic detection or in every language. It uses transcription minutes, and transcribing the recording afterwards uses them again.
Can I make a quiz and flashcards from a lecture?
Yes, on every plan; on Free, from the first 15 min it transcribes. Make a quiz of 5 to 20 questions with explanations, or 10 to 30 flashcards as question and answer, term and definition, or fill in the blank. Each uses one generation. You take the quiz and study the cards in the iPhone app; the web shows the answer key.
Can I transcribe an online lecture on Zoom, Teams or Google Meet?
Yes. If your course lets you download the recording, upload the file. Or ask your lecturer, then send the meeting bot. It joins as a guest, so it can't enter meetings limited to signed‑in users or your university, and the lecturer usually has to let it in. Meeting time is separate: 1 hr a month on Starter, which runs out before a 90‑minute lecture ends, 3 hr on Premium, 6 hr on Pro. It can't join webinars.
What languages can I transcribe a lecture in?
99+ languages, detected automatically, even when the lecturer switches mid-sentence. Translate the transcript into 99+ languages and read it side by side with the original. Or make the summary, quiz and flashcards in another language.
Can I make captions for my course video?
Yes. Download SRT or VTT captions for the lecture video, and set the characters per line and the seconds per caption. Most course video platforms and YouTube take SRT or VTT files, so you can add them yourself (checked 12 October 2026). Check the captions before you publish them.
Am I allowed to record a lecture?
It depends on your university. Ask your lecturer before you record, and keep it for your own study: many universities don't allow passing recordings or transcripts on. Students with a recording adjustment usually don't need to ask.
Can I transcribe a lecture for free?
Only part of one. Free transcribes the first 15 min of each file, 15 min a day and 30 min a month, with no card; its browser and iPhone recorders stop at 15 min. On the web, a longer upload gets a preview you can make a summary, quiz or flashcards from, 3 a month. Top‑up hours transcribe the rest; a summary, quiz or flashcards of a 90‑minute lecture need a paid plan.
How much does lecture transcription cost?
Free costs $0 for 30 min a month, up to 15 min a file. A paid plan starts with Starter at $7 a month for 5 hr of transcription. Premium ($20) has 20 hr and Pro ($40) has 40 hr. Two 75-minute lectures a week use about 10 hr 50 min a month, more with custom vocabulary. Before exams, add top‑up hours that never expire. Compare plans.
Transcribe your next lecture.
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