A) one strand turns anti-clockwise
B) the phosphate groups of two DNA stranifa at their ends, share the same position
C) the phosphate groups at the start of two DNA strands are in opposite position (pole)
D) one strand turns clockwise
Correct Answer: C
Solution :
J D Watson and F H C Crick (1953) showed that DNA has a double helical structure ill two polynucleotide chains connected by hydrogen bonds and running in opposite directions (anriparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
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