LECTURE 7 — DNA STRUCTURE AND REPLICATION DNA Structure

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Last updated 6:17 AM on 9/21/26
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13 Terms

1
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What are the building blocks of DNA?
Nucleotides.
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What is found at the 5′ end of a DNA strand?
A free phosphate group.
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What is found at the 3′ end of a DNA strand?
A free hydroxyl group.
4
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What bases are present in DNA?
Adenine, thymine, cytosine, and guanine.
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Which bases pair together in DNA?
A pairs with T, and C pairs with G.
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How many hydrogen bonds form between A and T?
Two.
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How many hydrogen bonds form between C and G?
Three.
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Which base pair is more stable, A-T or C-G?
C-G because it forms three hydrogen bonds.
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What does antiparallel mean in DNA?
The two strands run in opposite directions.
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If one strand runs 5′→3′, which direction does the opposite strand run?
3′→5′.
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What holds the two DNA strands together?
Hydrogen bonds between complementary bases.
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What overall shape does double-stranded DNA form?
A double helix.
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What two grooves are present in the DNA double helix?
Major groove and minor groove.