DNA Structure & ReplicationATI TEAS 7 cheat sheet

The double helix, copied

9 key facts 4 practice questions Reviewed Oct 2026

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Structure

A double helix of nucleotides: sugar, phosphate, base
A pairs with T, C pairs with G
The two strands run antiparallel

Replication

Semiconservative — each new molecule keeps one old strand
Helicase unzips; DNA polymerase builds the new strand
Happens during interphase, before cell division

Dna Vs Rna

DNA: double-stranded, deoxyribose, uses thymine
RNA: single-stranded, ribose, uses uracil

Mutation

A change in the base sequence; may be silent, harmful or beneficial

Key takeaway

The double helix, copied

Before you read

Test yourself first: 4 questions

Question 1 of 4

DNA replication is called 'semi-conservative' because each new molecule contains:

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