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What is meant the description "antiparallel" regarding the strands that make up DNA?

A) The twisting nature DNA creates nonparallel strands.
B) The 5' to 3' direction of the other strand runs counter to the 5' to 3' direction of the other strand.
C) Base pairings create unequal spacing between the two DNA strands.
D) One strand is positively charged and the other is negatively charged.
E) One strand contains only purines and the other contains only .

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Answer:

B) The 5' to 3' direction of the other strand runs counter to the 5' to 3' direction of the other strand.

Explanation:

Two strands in DNA double helix are in opposite directions alongside each other and that is called antiparallel orientation.

The 5' end of nucleic acid refers to  phosphoryl end (phosphate group) while 3' end refers to hydroxyl (OH) group.

The property of anti-parallelism is important for the process of DNA replication.

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