Master biology concepts with practice questions covering cells, genetics, evolution, ecology, and human body systems. Each question includes detailed explanations of biological processes and principles. Perfect for AP Biology prep, college intro biology courses, or MCAT study.
8 sample questions. Expand to see answers and explanations.
1. What is the primary function of mitochondria in eukaryotic cells?
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Answer
Produce ATP through cellular respiration
Explanation
Mitochondria are the powerhouse of the cell, converting glucose and oxygen into ATP (adenosine triphosphate) through the process of cellular respiration. This provides energy for cellular functions.
Type: multiple choice
2. Which type of RNA carries amino acids to the ribosome during protein synthesis?
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Answer
tRNA (transfer RNA)
Explanation
Transfer RNA molecules bind to specific amino acids and transport them to the ribosome, where they are assembled into proteins according to mRNA sequence.
Type: multiple choice
3. In Mendelian genetics, if both parents are heterozygous (Aa) for a trait, what percentage of offspring will be homozygous recessive (aa)?
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Answer
25%
Explanation
Use a Punnett square: Aa × Aa produces AA (25%), Aa (50%), and aa (25%). One in four offspring will be homozygous recessive.
Type: multiple choice
4. Which process do plants use to convert light energy into chemical energy?
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Answer
Photosynthesis
Explanation
Photosynthesis occurs in chloroplasts, where plants use sunlight, CO₂, and water to produce glucose (C₆H₁₂O₆) and oxygen. The light-dependent reactions and Calvin cycle work together.
Type: multiple choice
5. True or False: Enzymes are consumed in the reactions they catalyze.
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Answer
False
Explanation
False. Enzymes are biological catalysts that speed up reactions by lowering activation energy, but they are NOT consumed. They can be reused multiple times.
Type: true false
6. What structure in the cell membrane controls what enters and exits the cell?
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Answer
Phospholipid bilayer with embedded proteins (selectively permeable membrane)
Explanation
The cell membrane's phospholipid bilayer allows some substances to pass (small, nonpolar molecules) while blocking others. Transport proteins facilitate movement of larger or charged molecules.
Type: multiple choice
7. During which phase of mitosis do chromosomes align at the cell's equator?
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Answer
Metaphase
Explanation
In metaphase, chromosomes line up along the metaphase plate (cell equator) attached to spindle fibers. This precedes anaphase, when sister chromatids separate.
Type: multiple choice
8. Which level of protein structure involves the formation of alpha helices and beta sheets?
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Answer
Secondary structure
Explanation
Secondary structure forms through hydrogen bonding in the polypeptide backbone, creating regular patterns like alpha helices (coils) and beta sheets (pleats). Primary = sequence, tertiary = 3D folding, quaternary = multiple subunits.
Type: multiple choice
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Generate Now — FreeQuestions cover cell biology, genetics, evolution, ecology, human anatomy and physiology, and molecular biology at high school and college intro levels.
Yes. Questions match AP Biology format and difficulty, testing both factual knowledge and application of biological concepts.
Explanations describe biological processes in detail. For visual learners, supplement with diagrams from your textbook.
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