Multiple Choice
Why does a new DNA strand elongate only in the 5' to 3' direction during DNA replication?
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14. DNA Synthesis
Introduction to DNA Replication
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Which of the following is the correct complementary DNA strand for the segment 5'-ATCG-3'?
A
5'-ATCG-3'
B
5'-TAGC-3'
C
5'-CGAT-3'
D
5'-GCTA-3'
Verified step by step guidance1
Understand that DNA strands are complementary, meaning each base pairs with a specific partner: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).
Identify the given DNA strand: 5'-ATCG-3'.
Determine the complementary base for each nucleotide in the given strand: A pairs with T, T pairs with A, C pairs with G, and G pairs with C.
Write the complementary bases in the same order as the original strand, resulting in the sequence: 3'-TAGC-5'.
Reverse the sequence to match the 5' to 3' orientation, resulting in the complementary strand: 5'-CGAT-3'.
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