- Unit 2 ✏︎ Cells -
Unit 2.1 - Cell Structure & Function
LECTURE VIDEO
DESCRIPTION
Think you know what’s inside a cell? Think again. This isn’t your panic-memorized textbook diagram. This is the microscopic city where nothing pays taxes but everything has a very important job.
Welcome to your AP Biology bite-sized guide. We’re going from blurry microscope slides to the tiny machinery inside:
- Microscope Images: How to tell a prokaryote from a eukaryote (and just a dirty lens) so you don’t bomb the lab practical.
- Prokaryotes: The OGs. No nucleus, no membrane-bound organelles—just a nucleoid region and the ability to survive anywhere. Simple, but unstoppable.
- Mitochondria: The powerhouse that would unironically chug energy drinks.
- ER & Golgi: The cellular post office—minus the lost packages.
- Nucleus: DNA, drama, and the ultimate authority.
- Plant vs. Animal: Why plant cells are rigid and rock those green chloroplasts.
Go beyond memorization. Let’s actually understand cellular life—before your exam realizes you’ve been guessing this whole time.
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:15 – Overview Of This Video
00:01:01 – Intro To Cells
00:06:04 – The Cell Theory
00:16:08 – Size Of Biological Entities
00:23:43 – Eukaryotic Cells
00:33:53 – Animals Cells [Eukaryotic Cells]
01:32:32 – Plant Cells [Eukaryotic Cells]
01:45:38 – Prokaryotic Cells
02:16:33 – Summary Pages
02:27:02 – Questions & Answers
02:32:28 – Outro
Unit 2.2 - Cell Size
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 – In Progress
Unit 2.3 - Plasma Membrane
LECTURE VIDEO
DESCRIPTION
Forget brick walls—your cells are guarded by a bouncer made of fat who can’t make up his mind. This video on Membrane Structure is your backstage pass to the Fluid Mosaic Model, the greasy, protein-studded VIP lounge of life itself. We’re diving deep to explain:
- The Phospholipid Bilayer: Meet the fickle bouncers—hydrophilic heads who love water, and hydrophobic tails who absolutely despise it. Their identity crisis is the foundation of all life.
- Cholesterol: The cell’s very own mood manager. Is it too fluid? Too rigid? Cholesterol is there to stabilise the drama and keep the membrane from having a meltdown.
- Membrane Proteins: The polymaths, who simply have too many skills.
- Glycolipids & Glycoproteins: The cell’s fancy nametags and recognition system.
Stop seeing the membrane as a static wall and start seeing it for what it is: a dynamic, ever-changing party that keeps you alive.
TIMESTAMPS
STUDY RESOURCES
00:00 – Intro
00:15 – Overview Of This Video
00:58 – The Phospholipid Bilayer
13:37 – The Fluid Mosaic Model
24:00 – Role Of Membrane Proteins
32:40 – Glycolipids & Glycoproteins
36:45 – Membrane Fluidity
47:59 – A Brief History Of Membranes
50:34 – Questions & Answers
57:16 – Outro
Unit 2.4/2.5/2.6 - Membrane Transport
LECTURE VIDEO
DESCRIPTION
They’re not just bouncers at the club of life (keeping the riff-raff out)—they’re sophisticated doormen, revolving doors, and emergency exits all in one. Dive into the bustling city that is the cell membrane, where the traffic never stops!
This video pumps up the volume to explain:
- Simple & Facilitated Diffusion: From the laid-back O₂ just strolling through, to the glucose that needs a fancy protein doorman to let it in.
- Active Transport: The molecular superhero that defies gravity (and concentration gradients) using pure ATP energy. Someone’s gotta work the night shift!
- Osmosis: The dramatic saga of water, where it decides to throw a pool party in a cell or abandon it for a desert, leading to cells looking either plump or pruney.
- Bulk Transport: When the molecules are just too big to be polite. Watch as the membrane literally gobbles up lunch (endocytosis) or takes out the trash (exocytosis) in a spectacular display of cellular gluttony.
We’ll cut through the semi-permeable mystery to show you how your cells manage the ultimate logistics operation. No ticket required, just bring your curiosity
TIMESTAMPS
STUDY RESOURCES
00:00:00 – Intro
00:00:15 – Overview Of This Video
00:01:52 – Simple Diffusion
00:21:23 – Facilitated Diffusion
00:34:32 – Osmosis
00:42:53 – Active Transport
00:51:45 – Bulk Transport
01:00:46 – Summary Pages
01:06:19 – Questions & Answers
01:14:08 – Outro
Unit 2.7 - Tonicity & Osmoregulation
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 – In Progress
Unit 2.8 - Mechanisms Of Transport
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 – In Progress
Unit 2.9/2.10 - Cell Compartmentalization
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 – In Progress
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