Lesson on the purine synthesis and metabolism pathway, and the purpose, regulation and importance of the pathway in human physiology and health. In this lesson, I discuss the two purines (adenine and guanine), the importance of purines,...

Corrin/B12 Biochemistry: Methylmalonyl-S-CoA Mutase Mechanism

Lactose intolerance is quite common, especially in Asian countries. The reason behind this is “gene-culture co-evolution”. Lactose intolerance is the inability to digest lactose in milk because they lack the lactase enzyme. A 1981 study...

Plant Physiology and Chemistry Set: 6. This clip shows how, by the process of signal transduction, light is able to bring about chemical responses that result in the expression of genes.

In this video you'll learn how to simulate user interaction in your test cases. That means you can "click" a button and make sure the correct changes are made. This clip is from the chapter "Testing Your Application" of the series "The...

When it comes to mammals, we are the only species that drinks milk directly from other species, or we are the only one that does so in adulthood. Most juvenile animals can drink and digest their mother’s milk because they carry the...

FerredoxinNADP+ Reductase Generation of NADPH

Microbiology: Nitrate Reductase Test

There are a number of substances that are vital to all living organisms. In this lecture, I talk about substances like carbohydrates, lipids, proteins and nucleic acids, going into some detail about their structures and importance.

In this video, we explore the theory of the hippurate hydrolysis [hippuricase] test and how to interpret the results.

Na+/K+ Pump Function and Mechanism

If we want to understand a biological organism, we turn to the expression of its genome. Which genes are being expressed, and in which cells, and when? How does this differ between a normal cell and a cancer cell? We have incredibly...

Black licorice consumption has been linked to hypertension, hypokalemia, heart arrhythmias, edema and lethargy. A recent report by the US FDA has stated that black licorice consumption of more than 56.7 grams per day for 2 weeks can...

Lesson on the Carnitine Shuttle. Carnitine is an important metabolite derived from our diet or biosynthesized from lysine and methionine. Since the mitochondrial inner membrane is impermeable to long chain fatty acids, carnitine is used...

Cytochrome b6f Proton Pumping and ATP Synthesis

Lactose Transporter How Does it Work

Irreversible Inhibition: A Mechanistic Approach

Lineweaver-Burke Plot Example with y=mx+b

In this video, we discuss several homeostatic imbalances of the integumentary system and their mechanisms: albinism, a nevus, freckles, and hemangioma.

Lesson on Carnitine Biosynthesis. Carnitine is an important metabolite that is required for transportation of long chain fatty acids into the mitochondria via the Carnitine shuttle. Carnitine can be derived from dietary sources or from...

Phosphoglucomutase: Linking Glycogen to Glycolysis

Glycerol Catabolism

Let’s fly to Eukarytopia, the home of the eukaryotes! You can learn all about plants in the Garden of Babylon! This lesson will begin our series on eukaryotic cells. We’ll look at the structure of plant cells, focusing on components that...

In this video, we will discuss the mechanisms of different types of biochemical inhibitors, how to interpret their Michaelis-Menten plots, and their effects on Vmax and Km of enzymes.