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Quizzes > Science > Biology

Ultimate LC Biology Quiz: Test Your Knowledge Now!

Jump into our free biology quiz and ace every cell biology question!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for LC Biology quiz on cell biology, genetics, ecology on sky blue background

Ready to level up your LC Biology skills? Jump into our Ultimate Biology Quiz: Test Your LC Biology Knowledge and enjoy this free biology quiz packed with cell biology, genetics, and ecology challenges. Tackle biology quiz questions designed to boost your confidence, explore our interactive biology trivia game , or dive into our biology practice test questions for extra practice. Whether you need a focused cell biology quiz or a full-scale biology practice test with instant feedback, you'll gain clear insights and actionable tips. Perfect for high school students and budding scientists alike - start now and see where your curiosity takes you!

What is the basic unit of life?
Cell
Tissue
Organelle
Atom
All living organisms are composed of one or more cells, and cells carry out the basic functions necessary for life, such as metabolism and reproduction. This concept is a cornerstone of the cell theory in biology. Cells can exist as unicellular organisms or as part of multicellular organisms. Source
Which organelle is known as the powerhouse of the cell?
Mitochondrion
Nucleus
Ribosome
Golgi apparatus
Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), which cells use for energy. They have their own DNA and play a key role in cellular respiration. The nickname 'powerhouse' arises from their role in energy production. Source
Which molecule carries genetic information in most living organisms?
DNA
RNA
Protein
Lipid
Deoxyribonucleic acid (DNA) stores hereditary information in cells and directs the synthesis of RNA and proteins. RNA plays a role in translating DNA instructions but is not the main storage form. Proteins and lipids have structural and functional roles but do not encode genetic data. Source
Which process describes the movement of water across a semipermeable membrane?
Osmosis
Diffusion
Active transport
Endocytosis
Osmosis is the passive movement of water from an area of lower solute concentration to an area of higher solute concentration through a semipermeable membrane. Diffusion refers to the movement of solutes. Active transport and endocytosis require energy expenditure. Source
During which phase of mitosis do chromosomes align at the cell's equator?
Metaphase
Prophase
Anaphase
Telophase
In metaphase, spindle fibers attach to the centromeres of chromosomes and align them along the metaphase plate, or equatorial plane, of the cell. This alignment ensures that each daughter cell will receive one copy of each chromosome. It is preceded by prophase and followed by anaphase. Source
What is the complementary mRNA sequence for the DNA template strand 3'-AGTCA-5'?
5'-UCAGU-3'
5'-TCAGT-3'
5'-AGUCA-3'
5'-AGTCA-3'
During transcription, RNA polymerase reads the DNA template strand in the 3' to 5' direction and synthesizes mRNA in the 5' to 3' direction. Adenine pairs with uracil in RNA, and cytosine pairs with guanine. Thus, the sequence AGTCA becomes UCAGU. Source
Which enzyme unwinds the DNA double helix during replication?
DNA helicase
DNA polymerase
DNA ligase
RNA primase
DNA helicase breaks the hydrogen bonds between complementary bases, separating the two DNA strands to allow replication to proceed. DNA polymerase then synthesizes new DNA strands, while DNA ligase joins Okazaki fragments. RNA primase lays down RNA primers. Source
In a dihybrid cross of two heterozygotes (AaBb × AaBb), what is the expected phenotypic ratio of the offspring?
9:3:3:1
3:1
1:2:1
9:7
When two organisms heterozygous for two traits (AaBb) cross, independent assortment produces a 9:3:3:1 ratio of phenotypes: 9 showing both dominant traits, 3 showing dominant A and recessive b, 3 showing recessive a and dominant B, and 1 showing both recessives. Source
Which biome is characterized by high rainfall, warm temperatures, and exceptional biodiversity?
Tropical rainforest
Desert
Tundra
Taiga
Tropical rainforests receive over 2,000 mm of rain annually and maintain warm temperatures year-round, supporting dense vegetation and high species diversity. Deserts are arid, tundras are cold with low biodiversity, and taigas are coniferous forests with cooler climates. Source
What type of bond links amino acids in a protein's primary structure?
Peptide bond
Hydrogen bond
Disulfide bond
Ionic bond
Peptide bonds are covalent bonds formed between the carboxyl group of one amino acid and the amino group of another, creating a polypeptide chain. Hydrogen bonds, disulfide bonds, and ionic bonds contribute to higher-level protein structures, not the primary sequence. Source
How many carbon dioxide molecules are produced per glucose molecule in the Krebs cycle?
4
2
6
8
One glucose molecule yields two acetyl-CoA molecules, and each acetyl-CoA entering the Krebs cycle produces two CO?. Thus, a total of four CO? molecules are released per glucose. NADH and FADH? are also generated for the electron transport chain. Source
Which process converts pyruvate into lactate under anaerobic conditions in muscle cells?
Lactic acid fermentation
Alcoholic fermentation
Citric acid cycle
Oxidative phosphorylation
Under anaerobic conditions, pyruvate is reduced to lactate by lactate dehydrogenase, regenerating NAD? so glycolysis can continue producing ATP. Alcoholic fermentation occurs in yeast, while the citric acid cycle and oxidative phosphorylation require oxygen. Source
What modification is added to the 5' end of eukaryotic mRNA to protect it and assist in translation?
5' cap
Poly-A tail
Intron
Poly-U tail
Eukaryotic mRNAs receive a 7-methylguanosine cap at their 5' end immediately after transcription initiation. This cap protects mRNA from degradation and is recognized by the ribosome during translation initiation. A poly-A tail is added at the 3' end. Source
Which ecological concept refers to the maximum population size an environment can sustain indefinitely?
Carrying capacity
Niche
Habitat
Tolerance
Carrying capacity (K) is the maximum population size of a species that an environment can sustain given the availability of resources, habitat space, and competition. A niche describes a species' role, habitat is the physical environment, and tolerance is the range of conditions tolerated. Source
Which scenario best describes allopatric speciation?
Speciation due to geographic isolation
Speciation without physical barriers
Speciation from temporal isolation
Speciation driven by hybridization
Allopatric speciation occurs when populations are geographically separated by a barrier, preventing gene flow and leading to the evolution of distinct species. Sympatric speciation happens without physical barriers. Temporal isolation refers to timing differences, and hybridization involves interbreeding. Source
In the lac operon of E. coli, which molecule acts as the inducer by binding to the repressor and allowing transcription of the operon?
Allolactose
Lactose
Glucose
cAMP
Allolactose, an isomer of lactose, binds to the lac repressor causing a conformational change that releases it from the operator, enabling transcription of the lac operon genes. Lactose must first be converted to allolactose. Glucose and cAMP regulate catabolite repression differently. Source
In Michaelis-Menten kinetics, what does the Michaelis constant (Km) represent?
Substrate concentration at half Vmax
Enzyme concentration at half Vmax
Reaction rate at maximum substrate
Maximum velocity of the enzyme
Km is the substrate concentration at which the reaction velocity reaches half of its maximum (Vmax). It reflects the enzyme's affinity for its substrate—a lower Km indicates higher affinity. Km does not describe enzyme concentration or maximum velocity itself. Source
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Study Outcomes

  1. Understand cell biology fundamentals -

    After completing the quiz, you'll be able to recall and explain the functions of major cell organelles and their roles in cellular processes.

  2. Analyze genetic inheritance patterns -

    You will confidently work through genetics questions, interpreting pedigrees, Punnett squares, and DNA structure to predict trait transmission.

  3. Apply ecological principles -

    The quiz will enable you to relate concepts like food webs, energy flow, and population dynamics to ecological case studies and real-world environments.

  4. Evaluate overall LC Biology proficiency -

    Use your free biology quiz results to assess strengths and weaknesses across topics like cell biology, genetics, and ecology, guiding targeted revision.

  5. Interpret and solve biology quiz questions -

    Sharpen your test-taking strategies and become adept at tackling various question formats found in biology practice tests.

  6. Identify knowledge gaps for focused study -

    Pinpoint specific concepts that need improvement so you can create a targeted study plan and enhance future quiz performance.

Cheat Sheet

  1. Cell Theory and Organelle Functions -

    Cell theory states that all living organisms are made of cells, cells are the basic unit of life, and all cells arise from pre-existing cells (University of Oxford). When tackling cell biology quiz questions, match organelles like mitochondria (the powerhouse) and ribosomes (protein factories) to their roles. Use the mnemonic "Mighty MITO Chon" to recall that mitochondria have their own DNA and double membrane.

  2. Enzyme Kinetics and Michaelis-Menten Equation -

    Understand that enzyme-catalyzed reaction rates depend on substrate concentration following Vâ‚€ = (Vmax [S])/(Km + [S]) (Biochemical Society). In a biology practice test, identifying Vmax and Km from a Lineweaver - Burk plot is key to distinguishing enzyme efficiency. Remember "Low Km, high affinity" to gauge how tightly an enzyme binds its substrate.

  3. Mendelian Genetics and Hardy-Weinberg Equilibrium -

    Review Mendel's laws of segregation and independent assortment for monohybrid and dihybrid crosses (University of Cambridge). Apply the Hardy - Weinberg equation p² + 2pq + q² = 1 to predict allele frequencies in a non-evolving population. A quick mnemonic: "p², 2pq, q² are all true" to ensure you cover all genotypes.

  4. Photosynthesis and Cellular Respiration Equations -

    Memorize the core reactions: 6CO₂ + 6H₂O → C₆H₝₂O₆ + 6O₂ for photosynthesis and C₆H₝₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP for respiration (NCBI Bookshelf). Knowing these balanced equations is a staple of any biology quiz, and drawing them cyclically highlights how products of one fuel the other. Use a cycle diagram to visualize energy flow between chloroplasts and mitochondria.

  5. Energy Transfer in Ecosystems -

    Recall the 10% rule: only about 10% of energy at one trophic level passes to the next (Smithsonian Institution). Practice interpreting pyramid diagrams in a free biology quiz to identify producers, consumers, and decomposers. A handy phrase is "Eagles Can't Even Chew Bugs" to order Ecosystem tiers: Energy flows from Producers to Consumers and so on.

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