Multiple Choice
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4. DNA, Chromosomes, and Genomes
Structure and Function of DNA
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The two complementary DNA strands that make up the double helix run parallel to each other.
A
True
B
False
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of two strands that form a double helix. These strands are made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
Recognize the orientation of the strands: The two strands of DNA run in opposite directions, which is referred to as antiparallel orientation. One strand runs in a 5' to 3' direction, while the complementary strand runs in a 3' to 5' direction.
Identify the significance of antiparallel strands: This orientation is crucial for the replication and function of DNA, as it allows the enzymes involved in DNA replication and transcription to interact with the strands properly.
Clarify the misconception: The statement that the two complementary DNA strands run parallel to each other is incorrect because they actually run antiparallel.
Conclude with the correct understanding: The correct answer to the statement is 'False' because the DNA strands are antiparallel, not parallel.
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