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Released STAAR Biology EOC · 2025 · Item 22 · 1 point

Walkthrough: Biology 2025, Item 22

B.7A · DNA Structure · unscored study

A DNA sequence is shown. 5’ A T C G C T A G 3’ Which strand represents the complementary DNA sequence?

  1. 5’ T A C G G A T C 3’
  2. 5’ A T C G C T A G 3’
  3. 3’ T A G C G A T C 5’
  4. 3’ G A T C G C T A 5’

1. Understand the question

Write the complementary DNA strand. Use two rules: base pairing and antiparallel direction.

Try the question on your own first, then reveal one step at a time.

2. Solve it step by step

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