How does one DNA molecule differ from the other in a double stranded pair?
A. In the sequence of the nitrogenous bases.
B. In the spacing of the major and minor grooves.
C. In the composition of the sugar-phosphate backbone.
D. In the way in which the bases are attached to the sugars.
The Watson and crick model of DNA structure proposed that two right handed polynucleotide chains are coiled in helical fashion around the same axis, thus forming a double helix. The two chains or strands are antiparallel. The coiling of the two chains is such that they cannot be separated except by unwinding the coils, such coiling is called plectonemic.
TThe two antiparallel chains of double helical DNA are not identical in either base sequence Or composition. Instead, the two chains are complementary to each other: where ever adenine appears in one chain thymine is found in the other and vice versa and when ever guanine is found in one chain cytosine is found in the other and vice versa.
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