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Quizzes > Science

Biology Trivia: Test Your Knowledge

Quick, free biology quiz with answers. Instant results.

Editorial: Review CompletedCreated By: Jackie ConnollyUpdated Aug 26, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art showing stylized cells dna helix leaf microscope on coral background for free biology trivia quiz

This biology trivia quiz helps you check what you know about cells, genetics, and ecosystems. Answer quick questions, see which topics need work, and pick up a few facts along the way. For more practice, try the biology knowledge quiz, explore easy biology questions, or switch it up with a biology quiz with answers.

Which organelle is known as the powerhouse of the cell?
Chloroplast
Ribosome
Nucleus
Mitochondrion
Mitochondria are the primary site of ATP production via oxidative phosphorylation, supplying most of the cell's energy. They have their own DNA and double membrane structure. Due to their energy-generating role, they are referred to as the powerhouse of the cell. .
What is the smallest unit of life that can carry out all life processes?
Tissue
Molecule
Organelle
Cell
The cell is the basic structural and functional unit of all living organisms. It can perform all life processes such as metabolism, growth, and reproduction. Cells can exist as independent organisms or as part of multicellular life forms. .
Which nucleic acid carries the genetic blueprint in most organisms?
Protein
DNA
Lipid
RNA
Deoxyribonucleic acid (DNA) stores genetic information in the sequence of its nucleotide bases. It provides instructions for building proteins and passing traits to the next generation. RNA plays a role in translating those instructions but is not the main storage molecule. .
A group of similar cells working together to perform a specific function is called a:
Cell
Organ system
Organ
Tissue
A tissue is an ensemble of cells with a common structure and function. Multiple tissues combine to form an organ, which carries out specialized tasks. This hierarchy is key to understanding multicellular organization. .
Which organelle is primarily responsible for lipid synthesis and detoxification?
Lysosome
Rough endoplasmic reticulum
Golgi apparatus
Smooth endoplasmic reticulum
The smooth endoplasmic reticulum lacks ribosomes and is involved in lipid and steroid synthesis, as well as detoxification of drugs and poisons. It also helps in calcium ion storage in muscle cells. .
What is the process called in which water moves across a semipermeable membrane down its concentration gradient?
Active transport
Diffusion
Facilitated diffusion
Osmosis
Osmosis is the passive movement of water through a semipermeable membrane from a region of lower solute concentration to higher concentration. It is critical in maintaining cell turgor and volume. .
In a monohybrid cross between two heterozygous pea plants (Aa x Aa), what phenotypic ratio is expected in the offspring?
9:3:3:1
2:1
3:1
1:1
A monohybrid cross of two heterozygotes yields a phenotypic ratio of three dominant to one recessive in the F2 generation. This follows Mendel's law of segregation. .
Primary consumers in an ecosystem occupy which trophic level?
Second trophic level
First trophic level
Fourth trophic level
Third trophic level
Autotrophs form the first trophic level, while primary consumers (herbivores) that feed on autotrophs occupy the second trophic level. Secondary consumers feed on primary consumers, forming the third level. .
During oxidative phosphorylation, which complex of the electron transport chain first pumps protons from the mitochondrial matrix to the intermembrane space?
Complex IV (Cytochrome c oxidase)
Complex III (Cytochrome bc1 complex)
Complex I (NADH dehydrogenase)
Complex II (Succinate dehydrogenase)
Complex I receives electrons from NADH and transfers them to ubiquinone while pumping four protons across the inner mitochondrial membrane. Complex II does not pump protons but feeds electrons into the chain. .
Chiasmata, the points where homologous chromosomes exchange genetic material, are visible during which phase of meiosis?
Telophase I
Anaphase I
Metaphase I
Prophase I
Chiasmata form during prophase I of meiosis when homologous chromosomes pair and undergo crossing over. They become visible as points of genetic exchange. This is crucial for genetic diversity. .
Which of the following best describes epistasis in genetics?
A process where allele frequencies stay constant
Exchange of genetic material between chromosomes
Random changes in allele frequencies
Interaction where one gene masks the expression of another
Epistasis occurs when the effect of one gene is dependent on the presence of one or more 'modifier genes'. One gene's allele can mask or suppress the expression of another gene. This alters expected Mendelian ratios. .
CRISPR-Cas9 enables precise genome editing by which primary mechanism?
Methylating DNA at target sites
Transcribing target genes into mRNA
Creating double-strand breaks at specific sequences
Synthesizing new DNA strands
CRISPR-Cas9 uses a guide RNA to target a specific DNA sequence and the Cas9 nuclease to introduce a double-strand break. The cell's repair mechanisms then introduce mutations or precise edits. This method revolutionized genetic engineering. .
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Study Outcomes

  1. Understand Cell Structure and Function -

    Identify major organelles and describe their roles in vital life processes, enhancing your ability to tackle cell-focused trivia biology questions.

  2. Explain Fundamental Genetic Principles -

    Describe concepts such as DNA replication, Mendelian inheritance, and genetic variation to confidently answer genetics trivia questions.

  3. Identify Ecosystem Components and Interactions -

    Recognize producers, consumers, and decomposers and analyze their relationships within ecosystems to solve ecology-based biology quiz questions.

  4. Classify Organisms Using Taxonomic Hierarchy -

    Apply the hierarchical system of classification to group organisms and understand biodiversity in general biology trivia challenges.

  5. Recall Key Biology Terms and Definitions -

    Memorize essential vocabulary and concepts across various biology topics to boost accuracy in basic biology questions.

  6. Apply Critical Thinking to Biology Quizzes -

    Use logical reasoning and problem-solving skills to analyze and answer diverse biology trivia quiz prompts confidently.

Cheat Sheet

  1. Cellular Architecture Essentials -

    Master key organelles and membrane structures to tackle trivia biology questions on cells; remember "Lysosomes Take Out Trash" as a mnemonic for lysosome function (Source: NIGMS). Visualize the fluid-mosaic model of phospholipid bilayers and how integral proteins float, drawing from classic resources like Alberts et al.'s Molecular Biology of the Cell.

  2. Mendelian Genetics & Population Equations -

    Brush up on Punnett squares for monohybrid and dihybrid crosses to predict genotype ratios (Source: Nature Education). Use the Hardy - Weinberg equation (p² + 2pq + q² = 1) for allele frequencies in non-evolving populations and apply simple probability rules to answer general biology trivia with confidence.

  3. Biomolecule Building Blocks -

    Recall the four macromolecule classes - carbohydrates, lipids, proteins, and nucleic acids - and their monomer/polymer relationships (Source: Khan Academy). Employ the CHON mnemonic (Carbon, Hydrogen, Oxygen, Nitrogen) to remember elemental composition and note key bonds (e.g., peptide, glycosidic) in biology quiz questions.

  4. Ecological Energy Flow & Trophic Dynamics -

    Understand energy transfer through trophic levels using the 10% rule - producers → primary consumers → secondary consumers (Source: EPA). Link examples of producers (plants), consumers (herbivores/carnivores), and decomposers (fungi) to strengthen answers in your biology trivia quiz.

  5. Taxonomic Hierarchy Mnemonic -

    Use "King Phillip Came Over For Good Soup" to memorize Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species (Smithsonian Microbe Library). Apply this taxonomy framework in basic biology questions and general biology trivia to classify organisms accurately.

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