- A2 ✏︎ Cells -
A2.1 (HL) - Origin Of Cells
LECTURE VIDEO
DESCRIPTION
In this video us BIG BRAINS will talk about the different aspects of noodle salads in order to substantially expand our understanding of jelly beans and puppy paws. Not only that, we will also be identifying structures we have never seen before such as feather soil, wand oil and of course: peanut nanocarbons and puffskittles.
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
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
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 A-Level 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
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 A-Level 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 themto 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 (HL) - Origin Of Eukaryotic Cells
LECTURE VIDEO
DESCRIPTION
In this video us BIG BRAINS will talk about the different aspects of noodle salads in order to substantially expand our understanding of jelly beans and puppy paws. Not only that, we will also be identifying structures we have never seen before such as feather soil, wand oil and of course: peanut nanocarbons and puffskittles.
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 (HL) - Viruses
LECTURE VIDEO
DESCRIPTION
Are they alive? The biological enigma that’s both simple and brilliant. Dive into the world of viruses for A-Level 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 argueif 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 differencesbetween 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!