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Pre AP Biology -CELLS 5.1 Cell Cycle: Interphase- FRQ Exam Style Questions -New Syllabus

Pre AP Biology -CELLS 5.1 Cell Cycle: Interphase- FRQ Exam Style Questions – New Syllabus 2025-2026

Pre AP Biology -CELLS 5.1 Cell Cycle: Interphase- FRQ Exam Style Questions – Pre AP Biology – per latest Pre AP Biology Syllabus.

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Question

Many chemicals in the food we eat potentially have effects on cancer cells. Chocolate, for example, contains a number of flavonoid compounds, which act as natural antioxidants. Design an experiment to determine whether any of the flavonoids in chocolate inhibit the cell cycle of breast cancer cells growing in culture.

Most-appropriate topic codes (Pre-AP Biology):

• TOPIC: CELLS 5.2 — Cell Cycle: Cell Division: Cancer cells form when cell division continues without regulation .
• TOPIC: CELLS 5.1 — Cell Cycle: Interphase: The cell cycle is regulated by checkpoints during growth phases (G1 and G2) and the synthesis phase .
• TOPIC: CELLS 1.3 — Enzymes: The rate of chemical reactions in biological systems is affected by the concentration of substrates .
• TOPIC: Science Practice 3 — Experimental Variables: Identifying independent and dependent variables is a core practice in scientific investigation .
▶️ Answer/Explanation
Detailed solution

The experiment could compare cells growing in the presence and absence of chocolate flavonoids. One could observe the proportion of cells that are actively cycling in both treatments to identify if regulation has been restored or altered.

Gemini’s Explanation

To rigorously test the inhibitory effects of flavonoids, a controlled in vitro study is required. This aligns with the Pre-AP focus on Close Observation and Analysis of data sets. Here is a breakdown of the experimental design components:

  • Independent Variable: The concentration of specific chocolate flavonoids added to the breast cancer cell culture medium .
  • Dependent Variable: The rate of cell growth or the percentage of cells passing through cell division checkpoints .
  • Control Group: Breast cancer cells grown in standard medium without flavonoids to establish a baseline for unregulated division .
  • Experimental Procedure:
    1. Culture a specific line of breast cancer cells under identical conditions to maintain dynamic homeostasis in the control group .
    2. Treat experimental flasks with varying concentrations of extracted flavonoids .
    3. After a set period, analyze the cells to see if mitotic cell division has been slowed or stopped at the G1, G2, or metaphase checkpoints .

If the flavonoids successfully inhibit the cell cycle, we would expect to see a decrease in the number of identical daughter nuclei produced compared to the unregulated growth seen in the control group. This demonstrates how external chemicals can manipulate cell cycle regulation.

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