After a polypeptide is produced in protein synthesis, it's not necessarily a functional protein yet! Explore protein folding that occurs within levels of protein structure with the Amoeba Sisters! Primary, secondary, tertiary, and...

Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environment and in the food that we eat.

Paul Andersen describes the four major biological molecules found in living things. He begins with a brief discussion of polymerization. Dehydration synthesis is used to connect monomers into polymers and hydrolysis breaks them down...

Paul Andersen explains the structure and importance of proteins. He describes how proteins are created from amino acids connected by dehydration synthesis. He shows the importance of chemical properties in the R-groups of individual...

Paul Andersen describes the macromolecules that make up living organisms. He starts with a brief description of organic chemistry and the importance of functional groups. He also covers both dehydration and hydrolysis in...

In this video, we explore what peptide bonds are, their crucial role in protein synthesis, and the fascinating process of their formation. Understand where peptide bonds are found in nature and their significance in biology and...

What is an amino acid? Learn about the structure, classification, types and functions of amino acids in this fun video.

A molecule made up of a relatively short chain of amino acid building blocks.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....

Calvin Cycle Carbon Fixation, Rubisco, and Rubisco Activase

pH Effects on Amino Acid Structures

Bile Acid Biosynthesis 1: Conversion of Cholesterol to Secondary Bile Acids

Lipid Biosynthesis Phospholipid Synthesis 2 Cholines, Serines, & Ethanolamines

Lipid Biosynthesis Phospholipid Synthesis 1 Inositols & Glycerols

Catecholamine Biosynthesis from Tyrosine

Lipid Biosynthesis | Fatty Acid Biosynthesis 3: Fatty Acid Synthase

In this video, we discuss the psychedelic drug, dimethyltryptamine [DMT] and its biosynthesis, mechanism of action, metabolism, & elimination.

Complement 1 Classical Pathway

Propionyl S CoA

Vitamin K: Metabolism and Function

Beta-Alanine and Carnosine Biosynthesis

GABA Shunt or GABA Catabolism

Acetyl-S-CoA Carboxylase Part 1 (Biotin Carboxylase)

Lipid Biosynthesis | Fatty Acid Biosynthesis 2: Acetyl-CoA Carboxylase

In this video, I discuss the biosynthesis of the third aromatic amino acid, Tryptophan, from chorismate which occurs in the plastid (chloroplast).