Multiple Choice
The two antiparallel strands of nucleotides that form the DNA double helix are held together by __________.
14. DNA Synthesis
Discovering the Structure of DNA
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One strand of a DNA molecule has the base sequence 5′-ATAGGT-3′. The complementary base sequence on the other strand of DNA will be 3′- __________-5′.
A
TGGATA
B
TGGAUA
C
UAUCCA
D
ATAGGT
E
TATCCA
Verified step by step guidance1
Understand that DNA is composed of two strands that are complementary to each other, meaning that each base on one strand pairs with a specific base on the other strand.
Recall the base pairing rules for DNA: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).
Given the sequence 5′-ATAGGT-3′, identify the complementary bases for each nucleotide: A pairs with T, T pairs with A, G pairs with C, and so on.
Write the complementary sequence by replacing each base with its pair: A with T, T with A, G with C, and vice versa.
Reverse the order of the complementary sequence to match the 3′ to 5′ direction, resulting in the sequence 3′-TATCCA-5′.
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