HESI A2 Exam 2026: Sections, Scores & Study Plan
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Which organelle is known as the powerhouse of the cell because it produces most of the cell's ATP?
Cell Biology
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The HESI A2 is modular with up to 10 sections and no universal pass mark. See scored vs. pilot question counts, 2026 score requirements by school, and a free study plan.
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Which structure is found in plant cells but NOT in animal cells?
What is the primary function of the rough endoplasmic reticulum?
Question · Medium
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Which type of cell lacks a membrane-bound nucleus?
Which type of membrane transport requires the cell to expend ATP?
Water moves across a semipermeable membrane from a region of low solute concentration to high solute concentration. What is this process called?
A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?
Which organelle is the primary site of protein synthesis?
Which organelle contains hydrolytic enzymes that digest worn-out organelles and engulfed material?
The fluid mosaic model describes the plasma membrane as a:
Which organelle modifies, sorts, and packages proteins received from the endoplasmic reticulum?
Which cytoskeletal element is composed of actin and is involved in cell movement and cytokinesis?
Question · Hard
Which feature is unique to prokaryotic cells compared to eukaryotic cells?
What is the primary role of cholesterol in animal cell membranes?
Which process describes a cell engulfing a large particle by wrapping its membrane around it?
Chloroplasts and mitochondria are believed to have evolved from free-living prokaryotes through a process called:
The sodium-potassium pump moves how many sodium ions out and how many potassium ions in per ATP hydrolyzed?
Which structure inside the nucleus is the site of ribosomal RNA synthesis?
Which of the following is a monosaccharide?
Biomolecules
The building blocks (monomers) of proteins are:
Which type of bond holds amino acids together in a polypeptide chain?
Enzymes increase the rate of biochemical reactions by:
Lipids are primarily composed of which two elements bonded in long hydrocarbon chains?
Which of the following best describes a saturated fatty acid?
Which biomolecule serves as the long-term energy storage molecule in animals?
Which level of protein structure refers to the sequence of amino acids in a polypeptide?
Which factor would most likely denature an enzyme?
The monomers of nucleic acids are:
Which functional group is found at the active site of many enzymes and allows substrate binding?
A phospholipid molecule is amphipathic, meaning it has:
Which of the following pairs DNA bases together using three hydrogen bonds?
What is the net ATP yield from one glucose molecule during glycolysis?
Cellular Respiration
Where does glycolysis occur in a eukaryotic cell?
Which molecule is the final electron acceptor in aerobic cellular respiration?
The Krebs cycle (citric acid cycle) takes place in the:
ATP synthase produces ATP using which form of energy?
In the absence of oxygen, human muscle cells produce which compound through fermentation?
Approximately how many ATP are produced from one molecule of glucose during complete aerobic respiration?
Pyruvate produced in glycolysis is converted to which molecule before entering the Krebs cycle?
Which complex of the electron transport chain is the site where electrons from FADH2 enter the chain?
What is the overall summary equation for photosynthesis?
Photosynthesis
Within a chloroplast, where do the light-dependent reactions of photosynthesis take place?
Which pigment in chloroplasts is primarily responsible for absorbing light energy for photosynthesis?
The Calvin cycle uses ATP and NADPH from the light reactions to perform which key process?
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