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Question
Read the following and answer from given below:
In prokaryotes, DNA is circular and present in the cytoplasm but in eukaryotes, DNA is linear and mainly confined to the nucleus. DNA or deoxyribonucleic acid is a long polymer of nucleotides. In 1953, the first correct double-helical structure of DNA was worked out by Watson and Crick. Based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin. It is composed of three components, i.e., A phosphate group, a deoxyribose sugar, and a nitrogenous base. Different forms of DNA are B-DNA, Z-DNA, A-DNA, C-DNA, and D-DNA.
The double chain of B-DNA is coiled in a helical fashion. The spiral twisting of the B-DNA duplex produces ______
Options
right and left part
major and minor grooves
upper and lower sides
the linear and circular part
Solution
The double chain of B-DNA is coiled in a helical fashion. The spiral twisting of the B-DNA duplex produces major and minor grooves.
Explanation:
Due to spiral twisting, the B-DNA duplex comes to have two types of alternate grooves, i.e., major (length 22 Å) and minor (length 12 Å).
