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Released STAAR Biology EOC · 2025 · Item 2 · 1 point

Walkthrough: Biology 2025, Item 2

B.7A · DNA Structure · unscored study

A long coiled strand extends from an X-shaped chromosome labeled W. Farther along, a short bracketed section of the double-helix strand is labeled Z.
Cell structures W and ZOriginal visual from the released STAAR test.

The diagram shows important structures found in a cell. Two structures, W and Z, are labeled. Which statement BEST describes Structure W and Structure Z?

  1. Structure W is a gene and Structure Z is a chromosome.
  2. Structure W is a chromosome and Structure Z is a gene.
  3. Structure W is an amino acid and Structure Z is a nucleic acid.
  4. Structure W is a nucleic acid and Structure Z is an amino acid.

1. Understand the question

Two structures are labeled on a DNA diagram. Decide which is larger and contains the other.

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

2. Solve it step by step

Practice released items for this skill Back to the lesson

Question, artwork, answer key and rationale: Texas Education Agency released STAAR test. Walkthrough steps written by TEKSForge. Studying here does not change your mastery or scores.