Bozeman Science
Cooperative Interactions
Paul Andersen emphasizes the importance of cooperation in living systems. He starts with a brief description of game theory and why countries at peace do better over the long term. He then explains how microscopic cells cooperate in the...
Bozeman Science
Bacteria
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,...
Bozeman Science
The Cell Membrane
Paul Andersen gives you a brief introduction to the cell membrane. He starts by describing amphipathic nature of a phospholipid and how it assembles into a membrane. He gives an overview of the fluid mosaic model inside cells. He also...
Curated Video
Fluid mosaic model of the cell membrane
The plasma membrane is a complex structure made up of macromolecules that come together to form a fluid mosaic. In this video, we will look at the structure, properties and functions of the fluid mosaic model.
Curated Video
Plasma membrane: the security guard of the cell
The plasma membrane or cell membrane is an intricate structure made of macromolecules that work together to protect the cell. Think of it as the security guard of the cell - letting important substances in, and letting others out.
Professor Dave Explains
Natural Killer Cells: The Tumor Killers
Just a little bit left to go with the innate immune cells, so let's look at natural killer cells! These are cells which show cytolytic activity towards physiologically stressed cells like tumor cells and virus-infected cells. Let's break...
Curated Video
Cell Material Transport
Cell Material Transport describes the functions of membrane-bound cellular organelles by explaining how each facilitates transport of materials within cells.
Curated Video
The Prokaryotic Cell
The Prokaryotic Cell examines a prokaryotic cell by describing its structure.
Curated Video
The Eukaryotic Cell
The Eukaryotic Cell examines a eukaryotic cell by describing its structure.
JJ Medicine
Introduction to Hedgehog Signaling: Hedgehog Protein Synthesis and Release
Lesson on Hedgehog protein synthesis and cellular release. The Hedgehog signaling pathway is important in embryological development of both invertebrates and vertebrates. Hedgehog proteins are synthesized as precursor proteins and...
Professor Dave Explains
Glucocorticoids: Mechanisms and Side Effects
Glucocorticoids constitute a major drug class in treating inflammation and autoimmune disease. These include endogenous hormones that can be administered exogenously, but also synthetic alternatives with a variety of functions. These...
Journey to the Microcosmos
The Tiny Worlds Inside of Single-Celled Organisms
We often focus on the organisms, but what about the even smaller world inside of them?
Schooling Online
IB Biology: Cell Biology - Prokaryotic Cells
Biology can be pretty dry. You’re stuck in a classroom studying a textbook full of boring definitions and complicated diagrams... That’s why we’re going on a field trip with Sally! She’s visiting a floating city in the Pacific Ocean –...
Catalyst University
Brain-Derived Neurotrophic Factor (BDNF) | Signaling & Mechanism
In this video, we will discuss the signaling mechanism and overall effects of brain-derived neurotrophic factor (BDNF).
Catalyst University
Eicosanoid Biosynthesis [Part 2] | Leukotrienes
Eicosanoid Biosynthesis [Part 2] | Leukotrienes
Catalyst University
Eicosanoid Biosynthesis [Part 1] | Prostaglandins & Thromboxane A2
In this video, we explore the first part of eicosanoid biosynthesis, the conversion of arachidonic acid to the prostaglandins and thromboxane A2.
Catalyst University
Whole-Body Cholesterol Transport [Part 2/2] | LDL & HDL
In this video, we explore the composition and functions of LDL and HDL (reverse cholesterol transport).
Catalyst University
The Rough Endoplasmic Reticulum and Golgi Apparatus
The Rough Endoplasmic Reticulum and Golgi Apparatus
JJ Medicine
Hedgehog Signaling Pathway in Vertebrates | Purpose and Mechanism
Introductory lesson on the Hedgehog Signalling Pathway in Vertebrates. The Hedgehog signaling pathway is important in embryological development of both invertebrates and vertebrates. Hedgehog proteins facilitate the activation of the...
Catalyst University
Anatomy - Basics of Antigen Presentation
In this video, we look at the function of antigen-presenting cells (APCs): antigen presentation.
Catalyst University
Overview & Comparison of Water- vs Lipid-Soluble Hormones
This video includes a basic introduction to the endocrine system and then a comparison of the signaling between water-soluble and lipid-soluble hormones.