MDCAT Biology MCQ #760

In the Watson-Crick model diagram, the two strands of the DNA double helix are described as being oriented in which manner?

MDCAT Biology MCQ #760

  1. Question 1

    Q1. In the Watson-Crick model diagram, the two strands of the DNA double helix are described as being oriented in which manner?

    • A) Parallel
    • B) Concentric
    • C) Symmetrical
    • D) Antiparallel

    Answer: Antiparallel

    Explanation: DNA strands run in opposite directions (5' to 3' and 3' to 5'). Parallel is tempting but would not allow proper base pairing.