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Chapter 2

Chapter 1 - Cell Structure

Section 1 - Cell & Microscope

LECTURE VIDEO

DESCRIPTION

Think you know what a cell looks like? Those textbook diagrams are lies. The real thing is a chaotic mess—and we only figured that out because a Dutch guy got really into lens-grinding. Welcome to your A-Level Biology deep dive. We’re going from basic magnifying glasses to microscopes that could spot a virus judging you. In this video, we’re covering:

  • The Microscope Mania: Light microscopes (living cells, meh resolution) vs. electron microscopes (TEM for interiors, SEM for 3D glamour shots).
  • Magnification vs. Resolution: The classic A-Level trap. Magnification = bigger. Resolution = clearer. Without the latter, you’re just zooming in on a fuzzy nothing.
  • Organelle Spotting: Which structures you can actually see with a light microscope (nucleus, chloroplasts, cell wall) and which ones demand an electron microscope to even acknowledge your existence (ribosomes, ER, the small stuff).
  • Practical Must-Knows: Calibration, eyepiece graticules, and preparing you own one of a kind slide to view.

Stop squinting at blurry circles. Learn what you’re actually looking at—before your practical exam asks you to identify an organelle and you guess “vague blob.”

TIMESTAMPS

STUDY RESOURCES

00:00:00 – Intro

00:00:27 – WELCOME To TeachMe

00:02:32 – What Are Cells

00:07:24 – Size Of Stuff

00:15:34 – Light & Electron Micrographs

00:18:01 – Mechanism Of Light Microscope

00:28:04 – Mechanism TEM

00:33:57 – Mechanism Of SEM

00:38:19 – View living AND non-living specimens?

00:42:04 – Estimating Size (Eyepiece Graticule)

00:51:03 – Magnification (5 example questions)

01:00:48 – Resolution

01:08:39 – The Truth About Color

01:10:57 – Specimen Preparation & Colored Dyes

01:19:30 – Money

01:19:46 – Summaries (pictures & tables)

01:28:07 – Questions & Answers

01:37:20 – Outro

In a Nutshell
Notes
Questions

High Yield Essentials

Sexy Summary

Test Yourself

Section 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 so much more, including: 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

00:01:29 – Eukaryotic & Prokaryotic Cells

00:06:21 – Eukaryotic Cell Overview

00:16:29 – Animal Cells Structure

00:17:22 – Plasma Membrane, Protoplast, etc

00:20:58 – Nucleus

00:31:57 – DNA Packaging

00:33:42 – Ribosomes & RER

00:40:37 – Smooth Endoplasmic Reticulum (SER)

00:46:57 – Golgi Apparatus/Body/Complex

00:55:10 – Putting the puzzle together…

00:58:02 – Lysosomes & Vacuole

01:07:01 – Mitochondria

01:15:39 – Cytoskeleton

01:21:18 – Centrosome & Centrioles

01:26:48 – Flagella & Cilia(Specialized Structures)

01:33:22 – Microvilli (Specialized Structures)

01:37:05 – Questions & Answers (#1, #2, #3, #4)

01:41:00 – Plant Cells Structure

01:42:14 – Chloroplast

01:50:09 – Cell Wall

01:56:34 – Vacuole

02:01:37 – Key High Yield Summaries

02:05:48 – Questions & Answers (#5, #6, #7)

02:14:44 – Outro

In a Nutshell
Notes
Questions

High Yield Essentials

Click for preview

Test Yourself

Section 3 - 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 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 – Eukaryotic & Prokaryotic Cells

00:02:05 – Prokaryotic Cell Overview

00:06:22 – Prokaryotic Cell Structure

00:08:57 – Structures ALL bacteria have

00:16:21 – Structures SOME bacteria have

00:23:37 – Microscope Images Of Bacteria

00:27:24 – Endosymbiotic Theory

00:31:47 – Summary Pages/Diagrams

00:33:16 – Questions & Answers (#1, #2, #3, #4)

00:39:55 – Outro

In a Nutshell
Notes
Questions

High Yield Essentials

Click for Preview

Test Yourself

Section 4 - 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 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

00:00:00 – Intro

00:00:13 – Viruses, Eukaryotic & Prokaryotic Cells

00:02:02 – Virus Size & Examples

00:06:11 – Virus Structure

00:10:15 – Viruses Are NON-LIVING

00:16:14 – Antibiotics

00:17:14 – Microscope Images Of Viruses

00:19:13 – Questions & Answers (#1, #2, #3, #4)

00:23:00 – Outro

In a Nutshell
Notes
Questions

High Yield Essentials

Click for Preview

Test Yourself

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