- A2 ✏︎ Cells -
A2.1 - Origin Of Cells (HL)
LECTURE VIDEO
DESCRIPTION
Forget magic. Life isn’t about “vital forces” in broth—it’s about trillions of microscopic, complex, workaholic compartments following a simple, three-part rulebook.
This video tracks the greatest detective story in biology: how we went from believing in mice appearing from haystacks to knowing that everything alive is just cells throwing a 3.8-billion-year-long house party.
This video demolishes ancient myths and explains:
- Cell Theory – The Unbreakable Rulebook: The three simple statements that turned biology upside down. (1. All organisms are made of cells. 2. Cells are the basic unit of life. 3. All cells come from pre-existing cells. Sorry, spontaneous generation, you’re canceled.
- The 7 Functions of Life: What does it actually take to be “alive”? From metabolism to reproduction, we’ll meet the non-negotiable checklist every single cell—from paramecium to your neurons—must ace.
- The First Cell Origin Story: How did we get from “all cells from cells” to the very first cell? We’ll cover Louis Pasteur’s epic swan-neck flask experiment that killed spontaneous generation for good, the Miller-Urey experiment’s sparky primordial soup that cooked up life’s building blocks, and how lipids, RNA, and sheer luck built biology’s first tiny apartment.
Understand the rules that define life itself, from the first clumsy prototype to the complex city you’re made of today.
TIMESTAMPS
STUDY RESOURCES
00:00 – Video Contents
00:41 – Intro To Cells
05:34 – The Cell Theory
10:30 – The Functions Of Life
21:42 – Louis Pasteur
25:58 – Origin Of Cells Explained
39:45 – Origin Of Cells SUMMARY
41:08 – IB Questions & Answers
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
A2.2 - Cell & Microscope (SL/HL)
LECTURE VIDEO
DESCRIPTION
You can’t understand cells without understanding how we see them. This video is your ultimate guide to IB Biology Microscopy. We cut through the confusion to explain:
- What the heck the difference is between Light & Electron microscopes
- Why resolution and magnification is NOT the same thing.
- The simple trick to nail magnification calculations every time.
- And moooorreee.
Stop memorizing and start understanding. Upgrade your revision here!
TIMESTAMPS
STUDY RESOURCES
00:00 – Intro To cells
02:00 – What Are Microscopes?
03:46 – Light VS. Electron Microscopes
20:10 – Size Of Cells
25:05 – Magnification
29:57 – Conversion Of Units
30:58 – IB Question & Answer
35:14 – Summary
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
A2.2 - Eukaryotic Cells (SL/HL)
LECTURE VIDEO
DESCRIPTION
Think you know what’s inside a cell? Think again. This is the wild, complex world of eukaryotic cells like you’ve never seen them before. This IB Biology bite-sized guide breaks down the tiny organelles with massive jobs.
We’re not just labelling diagrams—we’re explaining:
- The Powerhouse: Why the mitochondria is so much more than a meme.
- The Protein Pathway: How the ER and Golgi work together like a cellular post office.
- The Command Centre: What the nucleus really holds inside.
- Plus: The key differences between animal and plant cells you MUST know.
Go beyond memorization. Understand how life works at the cellular level.
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
00:04:10 – The BIG IDEA Of Eukaryotic Cells
00:12:47 – Animal Cells Structure
00:15:24 – Plasma Membrane, Protoplast, Cytoplasm, Cytosol
00:19:04 – Nucleus & DNA Packaging
00:30:33 – Ribosomes & Rough Endoplasmic Reticulum (RER)
00:35:59 – Smooth Endoplasmic Reticulum (SER)
00:43:33 – Golgi Apparatus/Body/Complex
00:50:24 – Putting the puzzle together…
00:52:05 – Lysosomes & Vacuole
00:59:07 – Mitochondria
01:05:55 – Cytoskeleton
01:13:56 – Centrosome & Centrioles
01:18:58 – Flagella & Cilia, Microvilli
01:28:42 – Questions & Answers (#1, #2, #3, #4)
01:32:12 – Plant Cells Structure
01:33:00 – Cell Wall, Chloroplast, Vacuole
01:45:50 – Fungal Cells Structure
01:48:56 – Key High Yield Summaries
01:50:57 – How To Draw Cells
01:53:24 – Atypical Cells
01:58:19 – Questions & Answers (#5, #6, #7, #8)
02:01:18 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
A2.2 - Prokaryotic Cells (SL/HL)
LECTURE VIDEO
DESCRIPTION
They’re ancient, they’re everywhere, and they’re nothing like the cells in your body. This is your crash course on the fascinating world of prokaryotic cells for IB Biology.
Forget mitochondria and a nucleus—bacteria play by a completely different set of rules. In this video, we crack them open to show you:
- What’s REALLY inside: Spoiler: It’s way more than just cytoplasm.
- The truth about the nucleoid: Why it’s not a “real” nucleus.
- The tiny machines that can cause big trouble: Plasmids & flagella.
- How to draw and label them to absolutely nail your exam mark scheme.
They’re small, but your questions about them are huge. We’ve got the answers.
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
00:00:43 – Eukaryotic & Prokaryotic Cells
00:02:04 – The BIG IDEA Of Prokaryotic Cells
00:07:26 – Structure Of Prokaryotic Cells
00:09:02 – Prokaryote Structures (ALL HAVE)
00:20:44 – Prokaryote Structures (SOME HAVE)
00:29:48 – Microscope Images Of Bacteria
00:34:03 – Binary Fission
00:36:20 – HIGH YIELD Summary Pages/Diagrams
00:40:18 – Questions & Answers (#1, #2, #3, #4)
00:44:18 – Outro
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
A2.2 - Origin Of Eukaryotic Cells (HL)
LECTURE VIDEO
DESCRIPTION
One day, you’re a lonely blob just trying to make ATP. The next, you’ve been swallowed by a larger blob and accidentally become the powerhouse of the cell. Welcome to biology’s greatest corporate takeover story.
This video explores how cells went from simple loners to complex powerhouses, and how they later decided to “choose a career path” to build everything from your brain to your big toe.
This video untangles cellular history and career day to explain:
- Endosymbiotic Theory: The original “if you can’t beat ’em, eat ’em… and then don’t digest ’em” story. How ancient cells gobbled up bacteria and formed a permanent, world-changing roommates-with-benefits situation, leading to mitochondria and chloroplasts. (Evidence? They have their own DNA and throw a double-membrane house party.)
- Differentiation 101: How does one generic starter cell become a skin cell, a neuron, or a muscle? It’s not magic—it’s about switching genes on and off. Think of it as the ultimate cellular career counseling session.
- Specialization = The Body’s Dream Team: Why your red blood cells fire their nucleus to carry more oxygen, and your muscle cells pack themselves with fibers. We specialize to get the job done, even if it means some cells can never change careers again.
Understand the ancient mergers that built complex life and the modern “division of labor” that builds you.
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:13 – Overview Of This Video
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
A2.3 - Viruses (HL)
LECTURE VIDEO
DESCRIPTION
Are they alive? The biological enigma that’s both simple and brilliant. Dive into the world of viruses for IB Biology. They can’t reproduce, metabolize, or live on their own, yet they can bring the world to a standstill. This video deconstructs these tiny parasites to explain:
- Why scientists still argue if viruses are truly “living.”
- Exactly what’s in their minimalist toolkit: Nucleic acid, capsid, and not much else.
- The secret behind their success: How they hijack your cells like a hacker.
- The key differences between viruses and prokaryotic cells (it’s a big one!).
Understand the perfect parasite and ace those tricky exam questions.
TIMESTAMPS
STUDY RESOURCES
00:00 – Intro To Viruses
02:02 – Virus is NOT a cell
04:02 – Outbreak, Epidemic, & Pandemic
06:25 – Virus Characteristics
14:48 – The Lytic Cycle
22:39 – The Lysogenic Cycle
27:15 – Bacteriophage Lambda (Virus Example #1)
30:15 – Coronavirus (Virus Example #2)
32:34 – HIV (Virus Example #3)
36:31 – Origin Of Viruses
40:15 – Antigenic Shift VS Antigenic Drift
NOTES – All you need to know in one place!
QUESTIONS – Test your Big Brain!
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