A cell is placed in an anaerobic (oxygen-free) environment. Which of the following correctly describes the sequence of events that allows the cell to continue producing ATP through fermentation after glycolysis?

NADH donates its electrons to pyruvate, regenerating NAD+ so glycolysis can continue

The Krebs cycle runs in reverse to produce additional ATP without oxygen

The electron transport chain switches to carbon dioxide as the final electron acceptor

Pyruvate enters the mitochondrial matrix and is fully oxidized to generate ATP

HESI Biology Practice Questions — Free Sampler (2026)

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3 sample Biology questions

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Question 1Cellular respiration and photosynthesis
A cell is placed in an anaerobic (oxygen-free) environment. Which of the following correctly describes the sequence of events that allows the cell to continue producing ATP through fermentation after glycolysis?
- ANADH donates its electrons to pyruvate, regenerating NAD+ so glycolysis can continue
- BThe Krebs cycle runs in reverse to produce additional ATP without oxygen
- CThe electron transport chain switches to carbon dioxide as the final electron acceptor
- DPyruvate enters the mitochondrial matrix and is fully oxidized to generate ATP
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Question 2DNA/RNA, protein synthesis, heredity (Punnett squares)
A DNA template strand has the sequence 3'-TACGGATCC-5'. What is the corresponding mRNA sequence produced during transcription?
- A5'-AUGCCUAGG-3'
- B3'-AUGCCUAGG-5'
- C5'-TACGGATCC-3'
- D5'-ATGCCTAGG-3'
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Question 3Cell structure and organelles
A biology student examines a cell under a microscope and observes a large central vacuole, a cell wall, and chloroplasts. Which type of cell is the student most likely viewing?
- AAnimal cell
- BBacterial cell
- CPlant cell
- DFungal cell
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