Why semiconservative replication

Next lesson. Current timeTotal duration Google Classroom Facebook Twitter. Video transcript - Let's take a piece of DNA. And let's just unwind it into its two strands. And the question I want to ask you is, "If we were to replicate this DNA, "what would the end result look like? And so we have three choices. The first is conservative replication. So you can see the old pair, that looks just the same as what we had before, in yellow.

And then we have a completely new pair which is represented in blue. Our next choice is dispersive replication. In light of current knowledge, it is difficult to imagine a dispersive mechanism, but at the time, there were no mechanistic models at all.

The Meselson-Stahl experiments clearly demonstrated that the mechanism must be semi-conservative, and this was confirmed once the key enzymes were discovered and their mechanisms elucidated. In the Meselson-Stahl experiments, E.

Over 14 generations, this led to a population of E. Digestion 2. The Blood System 3. Disease Defences 4. Gas Exchange 5. Homeostasis Higher Level 7: Nucleic Acids 1. DNA Structure 2. Transcription 3. Translation 8: Metabolism 1. Metabolism 2. Cell Respiration 3. Photosynthesis 9: Plant Biology 1. Xylem Transport 2. Phloem Transport 3.

Plant Growth 4. Plant Reproduction Genetics 1. Meiosis 2. Inheritance 3. Speciation Animal Physiology 1. Antibody Production 2.