AP Biology Unit 3: Cellular Energetics Practice Test (Multiple Choice) Actual Q&A 2026

1|Page



AP Biology Unit 3: Cellular Energetics
Practice Test (Multiple Choice) Actual
Q&A 2026



How does ADP turn into ATP?



a. By adding an adenosine

b. By removing an adenosine

c. By adding a phosphate

d. By removing a phosphate

e. By adding an adenosine and removing a phosphate - correct-answer - C




The folded inner membrane in mitochondria increases its __________



a. Outer membrane size

b. Ability to get identified as mitochondria

,2|Page


c. Organelle size

d. Volume

e. Surface Area - correct-answer - E




Why do highly active cells have large amounts of mitochondria?



a. It increases the amount of ATP produced

b. It decreases the amount of ATP produced

c. It increases the amount of nutrients absorbed into the cell

d. It decreases the amount of nutrients absorbed into the cell

e. There is no significance to the large amounts of mitochondria as the same

amount of ATP will be produced - correct-answer - A




What is the ultimate source of energy?



a. Thermal energy

b. Radiant energy

, 3|Page


c. Electrical energy

d. Solar energy

e. Chemical Energy - correct-answer - D




Where does glycolysis occur?



a. Outer membrane of mitochondria

b. Inner membrane of mitochondria (Cristae)

c. Cytoplasm

d. Cellular membrane

e. Cytoskeleton - correct-answer - C




Where does the link reaction and Krebs cycle reactions occur?



a. Mitochondrial Cristae (Inner membrane)

b. Mitochondrial Matrix

c. Cytoplasm