Life’s been around on Earth for at least 3.7 billion years. But for most of that time, it was incredibly boring — just simple little cells squirming around in water. It only got interesting in the last few hundred million years. And that...

The cell is the basic unit of life, and our understanding of it has advanced as science, and the tools available to scientists, has advanced. In this episode of Crash Course Biology, we’ll take a look at the difference between...

Oxygen is pretty great stuff, but this recently discovered organism couldn’t care less about oxygen. It breathes nitrogen and may offer a window into how the types of cells in OUR bodies may have evolved billions of years ago.

The group of bacteria known as Chlamydiae doesn't do much to endear itself to us since these bacteria can cause a variety of illnesses. But it turns out that we may have Chlamydiae to thank for life as we know it!

Paul Andersen reviews the major concepts within the second unit of the new AP Biology framework. He starts by describing how life is organized into three domains. He explains how the history of life on the planet is...

In this video Paul Andersen explains how the mitochondria generates energy for the cell through aerobic respiration. He also explains how research into the organelle has shown its importance in eukaryotic evolution.

Oxygen is pretty great stuff, but this recently discovered organism couldn’t care less about oxygen. It breathes nitrogen and may offer a window into how the types of cells in OUR bodies may have evolved billions of years ago.

This Amoeba Sisters video starts with providing examples of prokaryotes and eukaryotes before comparing and contrasting prokaryotic cells with eukaryotic cells! Contents: 00:00 Intro 1:27 Modern Cell Theory 1:37 3 Domains (with examples...

Paul Andersen describes the structure and function of the major organelles in a eukaryotic cell. The endoplasmic reticulum, ribosomes, and golgi complex produce and store proteins in the cell. Lysosomes dissolve broken and invasive...

Why is RNA just as cool as DNA? Join the Amoeba Sisters as they compare and contrast RNA with DNA and learn why DNA should be sharing the limelight! Table of Contents: 00:00 Intro 0:54 Similarities of DNA and RNA 1:35 Contrasting DNA and...

Paul Andersen explains how cells duplicate through the process of cell division. Prokaryotic cells (like bacteria) duplicate through a process of binary fission. Eukaryotic cells (like you) duplicate body cells through mitosis and...

Paul Andersen explains how eukaryotic cells use compartmentalization to increase the surface area and level of specialization within the cell. Prokaryotic and eukaryotic cells are compared and contrasted. The role of both the...

Paul Andersen describes the defining characteristics of the domain Eubacteria. He begins with a quick description of the phylogeny of bacteria and horizontal gene transfer. He then surveys the structures of a bacteria; nucleoid region,...

Paul Andersen discusses the defining characteristics of the members of Domain Eukarya. He starts with a brief description of the phylogeny of life on earth. He then discusses the major characteristics of eukaryotic cells. He explains...

Paul Andersen introduces the nucleic acids of life; RNA and DNA. He details the history of DNA from Griffith, to Avery, to Hershey and finally to Watson and Crick. He also details the difference between prokaryotic and eukaryotic...

Paul Andersen explains how DNA replication ensures that each cell formed during the cell cycle has an exact copy of the DNA. He describes the Meselson-Stahl experiment and how it showed that DNA copies itself through a semi-conservative...

Paul Andersen explains how eukaryotic cells were formed through a process of endosymbiosis. He describes how aerobic bacteria became mitochondria and cyanobacteria became chloroplasts. He mentions an example of symbiosis that occurs...

Paul Andersen explains the central dogma of biology. He explains how genes in the DNA are converted to mRNA through the process of transcription. He then explains how ribosomes use this message to convert the mRNA to a functioning...

Paul Andersen takes you on a tour of the cell. He starts by explaining the difference between prokaryotic and eukaryotic cells. He also explains why cells are small but not infinitely small. He also explains how the organelles work...

This video compares different types of cells, including plant, animal, prokaryotic, and eukaryotic.

Practice life sciences questions using real examples from 2012.

Ribosomes are cell organelles with a peculiar structure and function. In this video, will talk about many things ribosomes, especially their roles in protein production and the differences between the types of ribosomes.

In an atom, the small, dense, positively charged structure at its centre, containing the protons and neutrons.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images...

In biology, the nucleus is the membrane-bound structure inside eukaryotic cells that contains most of the genetic material. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise...