Dna Structure

Easybiology

In a DNA double helix, the two strands are:

Antiparallel Polarity

Select the correct option:

Parallel

Antiparallel

Coiled clockwise

Identical

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About This Question

Subject: biology
Chapter: molecular basis of inheritance
Topic: dna structure
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

Antiparallel

DNA Polarity: The two strands of the DNA double helix run in opposite directions.
Spatial Arrangement: If one strand runs in the $5^{'} \to 3^{'}$ direction, its complementary partner must run in the $3^{'} \to 5^{'}$ direction.
Significance: This antiparallel arrangement is essential for base pairing and for the function of DNA polymerase during replication.
Conclusion: The two strands are antiparallel.

This easy difficulty biology question is from the chapter molecular basis of inheritance, covering the topic of dna structure. It appeared in the 2025 exam.

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Dna Structure

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