We’re now ready to tackle Membranes: Structure and Function. And shown here is a nice electron micro graphical mitochondria. Where you can see this smooth outer membrane and then the highly folded inner membrane in the cristi. So lets talk about membrane structure. We know that phospholipids are arranged in a bilayer, we’ve covered that […]
To make a particular protein in the cell the relevant gene is first switched on in the DNA. A working copy of the gene called messenger RNA is made. This copying process is called transcription. Next the information in the messenger RNA is acted upon to produce a protein.
To understand how a working copy of the gene is made, we need to be familiar with the structure of RNA. Unlike DNA, RNA is just a single strand of nucleotide units. In DNA, the sugar is deoxyribose, in RNA, it’s ribose. As for the basis, although three or identical, Adenine, Guanine, and Cytosine, the […]
Voiceover: So, today we’re going to talk about mutagens and carcinogens and how they can cause DNA damage, but first I want to review the central dogma of molecular biology and how the genetic information of a cell is stored in the form of DNA, which is then transcribed to form RNA and then translated […]
SPEAKER: What you are about to see is DNA’s most extraordinary secret, how a simple code is turned into flesh and blood. It begins with a bundle of factors assembling at the start of a gene. A gene is simply a length of DNA instruction stretching away to the left. The assembled factors trigger the […]
The breakthrough was in 1953, thanks to Cambridge scientists, Francis Crick and James Watson, in the most celebrated research of the 20th century. Using the x-ray pictures of DNA, taken by Rosalind Franklin and Maurice Wilkins, they struggled to make the data about the spaces between the atoms fit into a structure that made sense. […]
But where were the genes? What genes are made of remained a mystery but some scientists thought they knew where they were. Chromosomes – curious filaments in the nucleus of each cell behaved a bit like genes. You get one from each parent and pass one on to each offspring. Chromosomes contain protein, as well […]
Nutritional supplement a shun vs. our biological individuality a benevolent enterprise I hope that you are not expecting from this particle yet another sound advice about what diets and pills and tincture as you should implement into your eating habits as the title is hinting even if I was an expert in that field I […]