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Marlow Works

AP Biology / Unit 3

Unit 3 · 12–16%

Cellular Energetics

Enzymes manage rates. Respiration and photosynthesis manage energy currency.

Start first lessonUnit practice

Topics

  • Enzymes and reaction rates
  • ATP
  • Cellular respiration
  • Photosynthesis

Lessons

Key terms

Original practice

Marlow Works questions. If this unit does not have its own items yet, you will see other questions from the same course.

1 of 1Cellular Energetics · medium · short answer

Explain why a cell that cannot carry out oxidative phosphorylation can still produce a small amount of ATP from glucose.

Original Marlow Works item — not a College Board question.

Take your time—this is practice, not a test.

Review checklist

  1. 01Read a rate graph for an enzyme under changing pH or temperature.
  2. 02Track carbon and energy separately in respiration and photosynthesis.
  3. 03Name where glycolysis, the Krebs cycle, and the electron transport chain occur in eukaryotes.

Related resources

External links with reuse status. Marlow Works is independent and does not copy restricted exam or textbook material.

  • Official / link only

    AP Biology course page

    Official eight-unit framework, science practices, and lab resources.

    College Board · All rights reserved · accessed 2026-10-01

    Open source

  • Reference only — do not copy

    OpenStax Biology 2e

    Biology reference with commercial-use restrictions on the current publisher page.

    OpenStax · CC BY-NC-SA 4.0 with additional restrictions · accessed 2026-10-01

    Link only unless permission is obtained.

    Open source