Question

Who amongst the following scientists had no contribution to the development of the double-helix model for the structure of DNA? ·
A. Rosalind Franklin ·
B. Maurice Wilkins
C. Erwin Chargaff
D. Meselson and Stahl

Answer 1

DNA is a twofold abandoned helix, with the two strands associated with hydrogen bonds. Bases are constantly matched with Ts, and Cs are constantly combined with Gs, which is predictable with and represents Chargaff's standard. Most DNA twofold helices are correct given; that is, if you somehow managed to hold your correct hand out, with your thumb facing up and your fingers twisted around your thumb, your thumb would speak to the pivot of the helix and your fingers would speak to the sugar-phosphate spine.

Complete answer: Rosalind Franklin alongside Maurice Wilkins delivered the X-beam diffraction information of DNA and Erwin Chargaff proposed through cautious experimentation two guidelines that helped lead to the revelation of the twofold helix structure of DNA called the Chargaff rules.
-Meselson and Stahl didn't have any commitment to the improvement of the twofold helix however were associated with the experimentation of the semi-traditionalist nature of replication of DNA.
-Erwin Chargaff was an Austro-Hungarian-conceived American organic chemist, author, Bucovinian Jew, who emigrated to the United States during the Nazi time and was a teacher of natural chemistry at Columbia University clinical school. Through cautious experimentation, Chargaff found two guidelines that helped lead to the disclosure of the twofold helix structure of DNA.
-Maurice in 1958 upheld Watson and Crick's theory that DNA replication was semiconservative.
Hence, option D is correct.

Note: Twofold helix is the depiction of the structure of a DNA particle. A DNA atom comprises two strands that breeze around one another like a curved stepping stool. Each strand has a spine made of exchanging gatherings of sugar (deoxyribose) and phosphate gatherings. Appended to each sugar is one of four bases: adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by connections between the bases, adenine shaping a base pair with thymine, and cytosine framing a base pair with guanine.