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Released STAAR Biology EOC · 2026 · Item 32 · 1 point

Walkthrough: Biology 2026, Item 32

B.7B · Protein Synthesis · unscored study

A bar graph of anthocyanin concentration in micrograms per gram of fresh apples at 17 °C and 27 °C. At 17 °C: about 4 without UV radiation and 6.5 with UV radiation. At 27 °C: about 3.7 without UV radiation and 10.3 with UV radiation. Source: Ban, et al., Plant and Cell Physiology, 2007.
Anthocyanin production under different environmental conditionsOriginal visual from the released STAAR test.

Anthocyanin is a pigment that gives some plants red or blue coloration. Scientists examined the production of anthocyanin in fresh apples stored under different environmental conditions. The graph shows the amount of anthocyanin pigment per gram of fresh apples. Based on the graph, which statement correctly describes the conditions MOST LIKELY to produce the proteins involved in the gene expression of anthocyanin?

  1. Messenger RNA is most active when UV radiation is absent and when temperatures are warm.
  2. Messenger RNA is most active when UV radiation is present and when temperatures are cool.
  3. Messenger RNA is most active when UV radiation is present and when temperatures are warm.
  4. Messenger RNA is most active when UV radiation is absent and when temperatures are cool.

1. Understand the question

More pigment means the pigment genes were expressed more, so more mRNA was made. Find the bar with the most anthocyanin.

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

2. Solve it step by step

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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.