Il mio padlet supercalifragilistichespiralidoso by Marcella Mellea https://padlet.com/mellea_marcella/thzunx12b8w9 Realizzato con un rapido sorriso en-us 2017-02-09 14:52:23 UTC 2024-07-14 06:58:36 UTC hello@padlet.com mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793363 DNA: Structure and Functions

]]> 2017-02-09 14:59:05 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793363 A Short History of DNA1857 : Gregor Mendel performed his famous experiments into inheritance. 1869 : Friedrich Miescher isolated a new substance inside the nuclei of human white blood cells; he called it nuclein and thought it functioned as a storehouse of phosphorus. He found nuclein in every cell type he tested.1889 : Richard Altmann named the new substance nucleic acid; it was found only in the chromosomes.1928 : Frederick Griffith formed the thesis that DNA was the molecule of inheritance; about ten years later Oswald Avery confirmed this hypothesis.1929 : Phoebus Levene identified the components of DNA and showed in which order they were linked. He thought that the DNA chain was short and the basis repeated in the same order.1940s : Erwin Chargaff found that the amount of adenine was almost equal to the amount of thymine, and that the amount of guanine was almost equal to that of cytosine (Chargaff’s Rule). Rosalind Franklin and Maurice Wilkins obtained an x-ray pattern of DNA (helix shape).1953: James Watson and Francis Crick made the double helix model of DNA (thanks to Franklin and Wilkin's picture of the X-ray).1984: Alec Jeffreys developed DNA profiling. 1988: DNA profiling was first used in the Enderby murders case in Leicestershire (England). mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793532 2017-02-09 14:59:33 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793532 mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793705 1)      Answer the following questions

1.      When did the story of DNA start?

2.      Who isolated a new substance he called nuclein?

3.      Who stated that DNA was the molecule of inheritance?

4.      When was the X-ray pattern of DNA obtained?

5.      What model did Watson and Crick make?

6.      When was a DNA profiling first used?

]]> 2017-02-09 14:59:58 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793705 2) Put the correct form of the given word into the textThe first studies into DNA started in 1857 when Mendel carried out his famous 1)……………………. (EXPERIMENTAL) into 2)……………………(INHERIT) characteristics. Over a decade later Miescher succeeded in isolating 3)………………………..(NUCLEUS) inside human white blood 4)…………………(CELLULAR). In 1889 the 5)……………………….(SCIENTIFIC) R .Altmann was able to confirm that nuclein, or nucleic 6)…………………….(ACIDITY), as he called it, was only to be found in chromosomes. In the first half of the 7)………………………(TWENTY) century Griffith and Avery suggested that DNA was the 8)…………………………(MOLECULAR) responsible for the inheritance of physical features .However, the turning point in the study of DNA was the double helix model made by Watson and crick in 1952. mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793938 2017-02-09 15:00:35 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152793938 (4) DNA ReplicationWatch the following video about DNA Replication and discuss with your teacher and classmateshttps://www.youtube.com/watch?v=dKubyIRiN8 mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152794357 2017-02-09 15:01:33 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/152794357 mellea_marcella https://padlet.com/mellea_marcella/thzunx12b8w9/wish/160558692 2017-03-16 14:59:55 UTC https://padlet.com/mellea_marcella/thzunx12b8w9/wish/160558692