Question

Antiparallel strands of a DNA molecule means that

• A. One strand turns anti-clockwise
• B. The phosphate groups of two DNA strands 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

Answer 1

Answer: (C)

J D Watson and F H C Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).