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100+ Free MTEL Biology Practice Questions

Pass your MTEL Biology (Field 66) exam on the first try — instant access, no signup required.

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In the molecule ATP, energy is released for cellular work primarily when:

A
B
C
D
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2026 Statistics

Key Facts: MTEL Biology Exam

100 MC + 2 OR

Test Structure

MTEL Biology (66) test page

240

Passing Scaled Score

MTEL test information

$139

Subject Test Fee

MTEL registration

4 hours

Testing Time

MTEL Biology (66) test page

5 subareas

Content Subareas

Field 66 test objectives

20%

Open-Response Weight

Field 66 test objectives

22%

Organisms Subarea Weight

Field 66 test objectives

22%

Heredity and Evolution Weight

Field 66 test objectives

MTEL Biology (Field 66) is a computer-based subject-matter test of 100 multiple-choice questions plus 2 open-response items, with a passing scaled score of 240 and 4 hours of testing time. The official framework organizes the multiple-choice content into four subareas: Molecules: Structures and Processes (14%), Organisms: Structures and Processes (22%), Ecosystems: Interactions, Energy, and Dynamics (22%), and Heredity and Biological Evolution (22%), with the open-response Integration of Knowledge subarea worth 20%. This free 100-question bank mirrors that blueprint so 2026 Massachusetts candidates can practice cell biology, genetics, evolution, ecology, physiology, biochemistry, and scientific inquiry, then review explanations by subarea.

Sample MTEL Biology Practice Questions

Try these sample questions to test your MTEL Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which property of water is most directly responsible for its ability to dissolve ionic compounds such as table salt (NaCl)?
A.Its polarity, with partial charges that interact with ions
B.Its high specific heat capacity
C.Its ability to form a crystalline solid that is less dense than the liquid
D.Its nonpolar covalent bonds between hydrogen atoms
Explanation: Water is a polar molecule: oxygen carries a partial negative charge and the hydrogens carry partial positive charges. These partial charges surround and separate ions, making water an excellent solvent for ionic and polar substances.
2Enzymes increase the rate of biochemical reactions primarily by:
A.Increasing the temperature of the cell
B.Lowering the activation energy required for the reaction
C.Changing the equilibrium constant in favor of products
D.Adding energy directly to the reactant molecules
Explanation: Enzymes are biological catalysts that lower the activation energy of a reaction, allowing it to proceed faster at cellular temperatures. They do not change the overall energy difference between reactants and products.
3Which of the following macromolecules is composed of monomers called amino acids?
A.Carbohydrate
B.Lipid
C.Protein
D.Nucleic acid
Explanation: Proteins are polymers of amino acids joined by peptide bonds. The sequence of amino acids determines a protein's folding and ultimately its function.
4In the molecule ATP, energy is released for cellular work primarily when:
A.A phosphate group is removed by hydrolysis to form ADP
B.The adenine base is removed from the ribose sugar
C.A phosphate group is added to form a longer phosphate chain
D.The ribose ring is broken into smaller carbon fragments
Explanation: ATP releases usable energy when the terminal phosphate bond is hydrolyzed, producing ADP and inorganic phosphate. This energy drives many cellular processes such as active transport and muscle contraction.
5During the light-dependent reactions of photosynthesis, the oxygen that is released comes from:
A.Carbon dioxide molecules
B.Glucose molecules
C.Water molecules split during the reactions
D.ATP molecules being broken down
Explanation: In the light-dependent reactions, water is split (photolysis) to supply electrons to the photosystems, and the oxygen produced is released as a byproduct. The carbon in CO2 is later fixed into sugar in the Calvin cycle.
6In aerobic cellular respiration, the largest amount of ATP is produced during which stage?
A.Glycolysis
B.The Krebs (citric acid) cycle
C.Oxidative phosphorylation at the electron transport chain
D.Fermentation
Explanation: Most ATP in aerobic respiration is produced during oxidative phosphorylation, where the electron transport chain establishes a proton gradient that drives ATP synthase. Glycolysis and the Krebs cycle yield comparatively little ATP directly.
7A buffer solution in a biological system functions to:
A.Increase the rate of all enzyme reactions
B.Resist large changes in pH when acids or bases are added
C.Permanently neutralize all acids in the cell
D.Store excess energy as heat
Explanation: Buffers contain a weak acid and its conjugate base that absorb added hydrogen or hydroxide ions, keeping pH relatively stable. Stable pH is essential because enzymes function only within narrow pH ranges.
8Which statement best describes the role of carbon in living systems?
A.Carbon forms ionic bonds that make it useful only in salts
B.Carbon can form four covalent bonds, enabling diverse, complex molecules
C.Carbon is chemically inert and rarely bonds with other atoms
D.Carbon is found only in carbohydrates
Explanation: Carbon's four valence electrons allow it to form four stable covalent bonds, including with other carbon atoms. This bonding versatility lets carbon build the long chains and rings that make up the major biological macromolecules.
9Anaerobic respiration (fermentation) in human muscle cells produces which product when oxygen is limited?
A.Ethanol and carbon dioxide
B.Lactic acid
C.Pure glucose
D.Large amounts of ATP equal to aerobic respiration
Explanation: When oxygen is scarce, human muscle cells convert pyruvate to lactic acid through lactic acid fermentation, regenerating NAD+ so glycolysis can continue. This yields far less ATP than aerobic respiration.
10Saturated fats differ from unsaturated fats primarily because saturated fats:
A.Contain one or more carbon-carbon double bonds
B.Have no carbon-carbon double bonds in their fatty acid chains
C.Are always liquid at room temperature
D.Are composed of amino acids
Explanation: Saturated fatty acids contain only single carbon-carbon bonds, so they pack tightly and tend to be solid at room temperature. Unsaturated fats have one or more double bonds that introduce kinks, keeping them liquid.

About the MTEL Biology Exam

The MTEL Biology (66) test is the Massachusetts subject-matter exam required to teach biology. It assesses content knowledge across molecules and cell processes, organisms and physiology, ecosystems, and heredity and evolution, along with science and engineering practices.

Questions

100 scored questions

Time Limit

4 hours of testing time (about 4h 15m total appointment)

Passing Score

240 scaled score

Exam Fee

$139 per subject test (Massachusetts DESE / Pearson)

MTEL Biology Exam Content Outline

~14% of this bank

Molecules: Structures and Processes (Subarea I)

Biochemistry of water, key elements, bonding, pH, and enzymes; macromolecule structure and function; and cellular energy through ATP, photosynthesis, and aerobic and anaerobic respiration.

~22% of this bank

Organisms: Structures and Processes (Subarea II)

Cell theory, organelles, membrane transport, and the cell cycle; levels of organization and homeostasis; and human anatomy and physiology across the major body systems and feedback loops.

~22% of this bank

Ecosystems: Interactions, Energy, and Dynamics (Subarea III)

Niche, population, community, and ecosystem concepts; carrying capacity and species interactions; energy flow and trophic levels; carbon, nitrogen, and water cycling; succession; biodiversity; and human environmental impact.

~22% of this bank

Heredity and Biological Evolution (Subarea IV)

DNA structure, replication, transcription, and translation; mutations and biotechnology; meiosis, Punnett squares, and pedigrees; and natural selection, population genetics, Hardy-Weinberg, speciation, and phylogeny.

How to Pass the MTEL Biology Exam

What You Need to Know

  • Passing score: 240 scaled score
  • Exam length: 100 questions
  • Time limit: 4 hours of testing time (about 4h 15m total appointment)
  • Exam fee: $139 per subject test

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

MTEL Biology Study Tips from Top Performers

1Study to the official Field 66 objectives so your time matches the heaviest-weight subareas (organisms, ecosystems, and heredity and evolution)
2Build a strong biochemistry and cell-biology base first because it underlies energy, genetics, and physiology questions
3Practice genetics problem solving with Punnett squares, pedigrees, and Hardy-Weinberg calculations until they are automatic
4Connect concepts across subareas, such as how photosynthesis and respiration link cell biology to ecosystem energy flow
5Rehearse the two open-response tasks by explaining concepts clearly and designing a testable investigation with variables and controls
6Take timed full-length practice and review every miss by subarea to target your weakest content

Frequently Asked Questions

What is on the MTEL Biology (66) test?

The test covers four multiple-choice subareas: Molecules: Structures and Processes (14%), Organisms: Structures and Processes (22%), Ecosystems: Interactions, Energy, and Dynamics (22%), and Heredity and Biological Evolution (22%). A fifth subarea, Integration of Knowledge and Understanding (20%), is assessed through two open-response items.

How many questions are on the MTEL Biology test and how long is it?

MTEL Biology (66) has 100 multiple-choice questions plus 2 open-response assignments. Candidates have 4 hours of testing time within a total appointment of about 4 hours and 15 minutes that includes a tutorial and nondisclosure agreement.

What is the passing score for MTEL Biology (66)?

The passing scaled score is 240, the standard for MTEL subject tests. Your performance on the multiple-choice and open-response sections is combined into a single scaled score for the field.

How much does the MTEL Biology test cost in 2026?

The MTEL Biology (66) subject test fee is $139. Always confirm the current fee in your Pearson registration account before checkout, since MTEL pricing can change.

How are the MTEL Biology open-response items scored?

The two open-response items make up the Integration of Knowledge and Understanding subarea, worth about 20% of the test. They ask you to explain key scientific concepts and to form and support a testable claim, including discussing science and engineering practices for diverse learners.

How should I study for the MTEL Biology test?

Study to the official Field 66 objectives, prioritizing the heavily weighted organisms, ecosystems, and heredity-and-evolution subareas. Use timed mixed practice for stamina, review explanations by subarea, and rehearse the open-response tasks separately.