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Why are the strands of a DNA molecule said to be complementary?
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14. DNA Synthesis
Discovering the Structure of DNA
Multiple Choice
Which of the following DNA sequences is complementary to 5' TAGAC 3'?
A
5' CTCTA 3'
B
5' AGTCA 3'
C
5' GATCT 3'
D
5' ATCGT 3'
검증된 단계별 안내1
Understand that DNA strands are complementary and antiparallel. This means that the sequence on one strand determines the sequence on the other strand, and they run in opposite directions.
Identify the base pairing rules for DNA: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).
Given the sequence 5' TAGAC 3', determine the complementary bases for each nucleotide: T pairs with A, A pairs with T, G pairs with C, A pairs with T, and C pairs with G.
Write the complementary sequence in the 3' to 5' direction, as DNA strands are antiparallel. This results in the sequence 3' ATCTG 5'.
Reverse the sequence to match the 5' to 3' orientation, resulting in 5' GATCT 3'. This is the complementary sequence to the given DNA strand.
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