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Section 2: 90 minutes, 50% of final The AP Biology Curriculum Framework (College Board, 2012) states, “The double-stranded structure of DNA provides a simple and elegant solution for the transmission of heritable information to the next generation; by using each strand as a template, existing information can be preserved and duplicated with high fidelity within the replication This document details how each of the sample free-response questions in the course and exam description (CED) would be scored. This free practice exam features 177 questions that will help you not only review key biology concepts, but also familiarize yourself with the AP exam format. 4 Other Acellular Entities: Prions and Viroids; Key Terms; Chapter Summary; Review Questions; Critical Thinking Questions; Test Prep for AP® Courses; Science Practice Challenge Questions Introduction; 21. Flower color is controlled by a single gene in which the green allele (G) is dominant to the purple allele (g). 1 / 7. 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