Question

multiple choice question
when two molecular strands are connected but oriented in opposite directions, the strands are said to be
perpendicular
repelled
single stranded
antiparallel
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Explanation:

In molecular biology, when two molecular strands are connected but oriented in opposite directions, they are called antiparallel. This is a key concept, for example, DNA strands are antiparallel where one strand runs in the 5'-3' direction and the other in the 3'-5' direction. Perpendicular refers to a 90 - degree angle relationship, repelled is related to forces pushing apart, and single - stranded means there is only one strand, none of which describe the opposite - orientation relationship.

Answer:

D. antiparallel