Question

The DNA model proposed by Watson and Crick

• A. combined many of the findings of other researches also studying DNA such as Rosalind Franklin and Chargaff.
• B. showed the double helix nature of the molecule
• C. presented a molecule with sugar-phosphate backbones on the outside and paired bases on the inside
• D. all of the above

Answer 1

Answer: (D)

all of the above

Watson and Crick proposed a famous model of DNA double helix. Most of their clues regarding DNA structure came from Rosalind Franklin. Franklin was an expert in powerful technique for determining the structure of molecules, known as X-ray crystallography. When the crystallized form of a molecule such as DNA is exposed to X-rays some of the rays are deflected by the atoms in the crystal, forming a diffraction pattern that gives clues about the molecule structure. Watson and Crick proposed their model and said that the DNA molecule consists of two helically twisted strands connected together by base pairs, which align themselves in such a manner just like the steps of the ladder. Each strand consists of alternating molecules of the deoxyribose sugar and phosphate groups. The linkage between sugar and phosphate molecule is called a phosphodiester bond.

So, the correct option is 'all of the above'.