Question:
The two strands in a DNA molecule are ________ .
The two strands in a DNA molecule are ________ .
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The strands run in opposite directions and are held by base pairing.
Updated On: Nov 12, 2026
- parallel and complementary.
- antiparallel and complementary.
- parallel and non-complementary.
- anti parallel and non-complementary.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A DNA molecule is a double helix made of two polynucleotide strands.
Step 2: Direction
One strand runs from \(5'\) to \(3'\) and its partner runs from \(3'\) to \(5'\), so they are antiparallel.
Step 3: Base pairing
Adenine pairs with thymine and guanine pairs with cytosine, so one strand determines the other and they are complementary.
Final Answer:
The two strands of DNA are antiparallel and complementary. \[ \boxed{\text{(B) }\text{antiparallel and complementary}} \]
A DNA molecule is a double helix made of two polynucleotide strands.
Step 2: Direction
One strand runs from \(5'\) to \(3'\) and its partner runs from \(3'\) to \(5'\), so they are antiparallel.
Step 3: Base pairing
Adenine pairs with thymine and guanine pairs with cytosine, so one strand determines the other and they are complementary.
Final Answer:
The two strands of DNA are antiparallel and complementary. \[ \boxed{\text{(B) }\text{antiparallel and complementary}} \]
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