The Discovery of DNA - 3 - The Hershey and Chase Experiment
59 views
About :
TEST YOURSELF with the Verification Test (does not require personal data or registration) https://forms.gle/TNK44bUzAGcSZRD26 At the end of the test you can view the answers you gave and see your score, correct and incorrect answers. Third of four videos on the discovery of DNA (third year high school program) Griffith's experiment and the subsequent one by Avery and collaborators had demonstrated with good certainty that it was DNA and not proteins that was the molecule responsible for genetic information. The resistance to this demonstration was difficult to dismantle, until the experiment by Hershey and Chase described in this video. The main objective of Hershey and Chase was therefore to determine which component of viruses, proteins or deoxyribonucleic acid (DNA), was responsible for transmitting genetic information to host cells. The two scientists managed to resolve the dilemma of whether the genetic material was made up of proteins or DNA. They used a very refined approach, using T2 Bacteriophages: viruses, which infect Escherichia coli bacteria and are made up of a protein capsid that wraps the genetic material (DNA). So they are only made up of DNA and proteins. To trace the DNA they used radioactive Phosphorus (³²P) and to trace the proteins they used radioactive Sulphur (³⁵S). Watch the video to find out how they did it. In the next video the last two series of data that led Watson and Crick to the discovery of the structure of DNA: Chargaff's rules and Rosalind Franklin's X-ray photography of DNA crystals. 00:20 presentation 01:40 T2 series phages 03:50 the mechanism of phage infection 04:45 the structure of T2 phages 06:00 the experimental procedure Previous videos Miesher and nuclein, Levene and nucleotides • The discovery of DNA - 1 - Miescher, the... Griffith and Avery's experiment • The discovery of DNA - 2 - the experimen... Next video: Chargaff's rules and Rosalind Franklin's photo • The discovery of DNA - 4 - The rules of... The chromosomal theory of inheritance and Morgan's experiments podcast: • Morgan and the chromosomal theory of inheritance and Morgan's experimen... Mendelian genetics: • Mendelian genetics DNA and gene expression: • DNA and gene expression https://scienzita.blogspot.com/
370,061 views 6 days ago
737,706 views 2 days ago
Chicken Skewers VS Hotdogs in 24 Hours!! How Many Can You Eat at Once to Get Full?! (Skewer Warning)
827,559 views 8 days ago
673,097 views 2 days ago
980,876 views 12 days ago
Google AdSense
336 x 280
336 x 280
Up Next
MBCNEWS
588,255 views
Streamed 5 days ago
Streamed 5 days ago
MBCNEWS
408,789 views
Streamed 5 days ago
Streamed 5 days ago
MBCNEWS
737,280 views
Streamed 7 days ago
Streamed 7 days ago
MBC PD수첩
3,494,380 views
Streamed 2 weeks ago
Streamed 2 weeks ago
MBC PD수첩
1,491,885 views
Streamed 7 days ago
Streamed 7 days ago
MBC PD수첩
3,180,865 views
Streamed 11 days ago
Streamed 11 days ago
Çağrı Ergün
280,480 views
2 years ago
2 years ago
HTalks
278,444 views
Streamed 3 weeks ago
Streamed 3 weeks ago
Çağrı Ergün
109,165 views
2 years ago
2 years ago
Çağrı Ergün
90,639 views
1 year ago
1 year ago
Школково ЕГЭ, ОГЭ, олимпиады
197,452 views
Streamed 1 year ago
Streamed 1 year ago
Elraenn
456,903 views
2 years ago
2 years ago
Çağrı Ergün
41,797 views
1 year ago
1 year ago
Çağrı Ergün
93,133 views
1 year ago
1 year ago
Çağrı Ergün
151,098 views
1 year ago
1 year ago
HTalks
470,072 views
Streamed 1 month ago
Streamed 1 month ago
Tarih Obası
123,900 views
Streamed 4 months ago
Streamed 4 months ago
Çağrı Ergün
136,107 views
2 years ago
2 years ago
Çağrı Ergün
115,612 views
2 years ago
2 years ago
Çağrı Ergün
114,705 views
1 year ago
1 year ago
Google AdSense
336 x 280
336 x 280