100 Biology questions • 30 Clinical/Scenario-based • Tap “Answer” for explanation.
Explanation: cell best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: What is the basic structural and functional unit of life
Explanation: Mitochondria generate most aerobic ATP through the TCA cycle and oxidative phosphorylation.
Key Concept / Clinical Relevance: Foundation concept: Which organelle is the principal site of aerobic ATP production in eukaryotic cells
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: Which cellular structure is the site of protein synthesis
Explanation: DNA best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: What is the principal genetic material in human cells
Explanation: Normal human somatic cells are diploid, with 23 pairs (46 chromosomes).
Key Concept / Clinical Relevance: Foundation concept: How many chromosomes are normally present in a human somatic cell
Explanation: Normal gametes are haploid and contain one member of each chromosome pair.
Key Concept / Clinical Relevance: Foundation concept: How many chromosomes are normally present in a human gamete
Explanation: Mitosis preserves chromosome number and normally yields two genetically similar daughter cells.
Key Concept / Clinical Relevance: Foundation concept: What is the usual cellular outcome of mitosis
Explanation: Meiosis includes two divisions after one DNA replication, reducing chromosome number and generating variation.
Key Concept / Clinical Relevance: Foundation concept: Compared with the parental germ cell, meiosis produces cells with what chromosome number
Explanation: Transcription uses DNA as a template to synthesize RNA.
Key Concept / Clinical Relevance: Foundation concept: What is synthesized during transcription
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: On which cellular structure does translation occur
Explanation: The plasma membrane is a phospholipid bilayer containing proteins, cholesterol and carbohydrates.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes plasma membrane is mainly a
Explanation: Diffusion is passive net movement down a concentration gradient.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes diffusion moves particles down their
Explanation: Active transport moves solute against its electrochemical gradient using energy directly or indirectly.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes active transport requires
Explanation: Haemoglobin reversibly binds oxygen, allowing efficient oxygen carriage in blood and unloading in tissues.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes oxygen is mainly transported in blood bound to
Explanation: The nephron is the functional unit that filters plasma and modifies tubular fluid to form urine.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes functional unit of kidney
Explanation: Alveoli provide a very large, thin surface for diffusion of respiratory gases between air and pulmonary capillary blood.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes functional gas-exchange unit of lung
Explanation: ventricles best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes main pumping chambers of heart
Explanation: Insulin promotes glucose uptake and storage and suppresses hepatic glucose production, lowering plasma glucose.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes insulin generally lowers
Explanation: T4 and T3 best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes thyroid gland mainly secretes
Explanation: electrochemical signals best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes neurons primarily transmit
Explanation: B lymphocytes/plasma cells best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes antibodies are produced by differentiated
Explanation: rapid and non-specific best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes innate immunity is generally
Explanation: chloroplasts best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes photosynthesis in plants occurs mainly in
Explanation: catalysts best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes enzymes are biological
Explanation: stable internal environment best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Which option best describes homeostasis means maintenance of a relatively
Explanation: cell best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Basic structural and functional unit of life.
Explanation: Mitochondria generate most aerobic ATP through the TCA cycle and oxidative phosphorylation.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Powerhouse of the cell.
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Site of protein synthesis.
Explanation: DNA best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Genetic material in most human cells.
Explanation: Normal human somatic cells are diploid, with 23 pairs (46 chromosomes).
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Human somatic cells normally contain.
Explanation: Normal gametes are haploid and contain one member of each chromosome pair.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Human gametes normally contain.
Explanation: Mitosis preserves chromosome number and normally yields two genetically similar daughter cells.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Mitosis usually produces.
Explanation: Meiosis includes two divisions after one DNA replication, reducing chromosome number and generating variation.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Meiosis produces cells with.
Explanation: Transcription uses DNA as a template to synthesize RNA.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Transcription produces.
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Translation occurs on.
Explanation: The plasma membrane is a phospholipid bilayer containing proteins, cholesterol and carbohydrates.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Plasma membrane is mainly a.
Explanation: Diffusion is passive net movement down a concentration gradient.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Diffusion moves particles down their.
Explanation: Active transport moves solute against its electrochemical gradient using energy directly or indirectly.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Active transport requires.
Explanation: Haemoglobin reversibly binds oxygen, allowing efficient oxygen carriage in blood and unloading in tissues.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Oxygen is mainly transported in blood bound to.
Explanation: The nephron is the functional unit that filters plasma and modifies tubular fluid to form urine.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Functional unit of kidney.
Explanation: Alveoli provide a very large, thin surface for diffusion of respiratory gases between air and pulmonary capillary blood.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Functional gas-exchange unit of lung.
Explanation: ventricles best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Main pumping chambers of heart.
Explanation: Insulin promotes glucose uptake and storage and suppresses hepatic glucose production, lowering plasma glucose.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Insulin generally lowers.
Explanation: T4 and T3 best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Thyroid gland mainly secretes.
Explanation: electrochemical signals best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Neurons primarily transmit.
Explanation: B lymphocytes/plasma cells best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Antibodies are produced by differentiated.
Explanation: rapid and non-specific best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Innate immunity is generally.
Explanation: chloroplasts best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Photosynthesis in plants occurs mainly in.
Explanation: catalysts best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Enzymes are biological.
Explanation: stable internal environment best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Identify the correct answer for: Homeostasis means maintenance of a relatively.
Explanation: cell best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Basic structural and functional unit of life.
Explanation: Mitochondria generate most aerobic ATP through the TCA cycle and oxidative phosphorylation.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Powerhouse of the cell.
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Site of protein synthesis.
Explanation: DNA best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Genetic material in most human cells.
Explanation: Normal human somatic cells are diploid, with 23 pairs (46 chromosomes).
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Human somatic cells normally contain.
Explanation: Normal gametes are haploid and contain one member of each chromosome pair.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Human gametes normally contain.
Explanation: Mitosis preserves chromosome number and normally yields two genetically similar daughter cells.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Mitosis usually produces.
Explanation: Meiosis includes two divisions after one DNA replication, reducing chromosome number and generating variation.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Meiosis produces cells with.
Explanation: Transcription uses DNA as a template to synthesize RNA.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Transcription produces.
Explanation: Ribosomes translate mRNA codons into a polypeptide chain.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Translation occurs on.
Explanation: The plasma membrane is a phospholipid bilayer containing proteins, cholesterol and carbohydrates.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Plasma membrane is mainly a.
Explanation: Diffusion is passive net movement down a concentration gradient.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Diffusion moves particles down their.
Explanation: Active transport moves solute against its electrochemical gradient using energy directly or indirectly.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Active transport requires.
Explanation: Haemoglobin reversibly binds oxygen, allowing efficient oxygen carriage in blood and unloading in tissues.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Oxygen is mainly transported in blood bound to.
Explanation: The nephron is the functional unit that filters plasma and modifies tubular fluid to form urine.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Functional unit of kidney.
Explanation: Alveoli provide a very large, thin surface for diffusion of respiratory gases between air and pulmonary capillary blood.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Functional gas-exchange unit of lung.
Explanation: ventricles best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Main pumping chambers of heart.
Explanation: Insulin promotes glucose uptake and storage and suppresses hepatic glucose production, lowering plasma glucose.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Insulin generally lowers.
Explanation: T4 and T3 best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Thyroid gland mainly secretes.
Explanation: electrochemical signals best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Foundation concept: Choose the best answer: Neurons primarily transmit.
Explanation: Mitochondria perform oxidative phosphorylation; cyanide inhibits cytochrome c oxidase.
Key Concept / Clinical Relevance: Cellular respiration and mitochondrial function.
Explanation: Activated B lymphocytes differentiate into plasma cells that secrete antibodies.
Key Concept / Clinical Relevance: Humoral immunity depends on B cells.
Explanation: Water moves across a semipermeable membrane down its water-potential gradient by osmosis.
Key Concept / Clinical Relevance: Osmosis is central to fluid balance.
Explanation: Duchenne muscular dystrophy primarily damages skeletal muscle fibres.
Key Concept / Clinical Relevance: Tissue structure relates directly to organ function.
Explanation: Human mitochondrial DNA is transmitted predominantly through the ovum.
Key Concept / Clinical Relevance: Mitochondrial inheritance is maternal.
Explanation: Failure of homologous chromosomes or sister chromatids to separate can produce aneuploid gametes.
Key Concept / Clinical Relevance: Meiotic nondisjunction causes common aneuploidies.
Explanation: Insulin promotes glucose uptake and storage and suppresses hepatic glucose production, lowering plasma glucose.
Key Concept / Clinical Relevance: Endocrine cell specialization.
Explanation: IgE bound to mast cells mediates type I immediate hypersensitivity.
Key Concept / Clinical Relevance: IgE-mediated mast-cell activation underlies anaphylaxis.
Explanation: Innate immunity provides rapid, nonspecific first-line defence.
Key Concept / Clinical Relevance: Neutrophils are key innate immune effector cells.
Explanation: Hepatocytes conjugate bilirubin, making it more water soluble for excretion.
Key Concept / Clinical Relevance: Liver metabolism is central to bilirubin handling.
Explanation: Involuntary and striated best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Cardiac muscle has specialized structural and electrical properties.
Explanation: Kidneys regulate bicarbonate and hydrogen-ion handling over hours to days.
Key Concept / Clinical Relevance: Renal physiology provides long-term acid-base control.
Explanation: Memory B and T cells enable a faster, stronger secondary immune response.
Key Concept / Clinical Relevance: Vaccination exploits adaptive immune memory.
Explanation: Sickle cell disease results from a pathogenic single-gene variant in HBB.
Key Concept / Clinical Relevance: A small DNA sequence change can alter protein structure and phenotype.
Explanation: Skin forms the major external physical barrier against fluid loss and infection.
Key Concept / Clinical Relevance: Epithelial barriers are essential for homeostasis.
Explanation: Most oxygen in blood is carried reversibly bound to haemoglobin in erythrocytes.
Key Concept / Clinical Relevance: Haemoglobin is the principal oxygen carrier.
Explanation: Haemophilia impairs the coagulation component of haemostasis.
Key Concept / Clinical Relevance: Normal haemostasis requires platelets and coagulation factors.
Explanation: Bacteria can acquire resistance genes by mechanisms such as conjugation, transformation or transduction.
Key Concept / Clinical Relevance: Horizontal gene transfer accelerates antimicrobial resistance.
Explanation: CD4 T lymphocytes best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: CD4 cells coordinate adaptive immune responses.
Explanation: Teratogenic exposure during critical developmental windows can cause congenital anomalies.
Key Concept / Clinical Relevance: Timing of exposure is crucial in embryonic development.
Explanation: Neurulation best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: Early embryonic morphogenesis has defined critical periods.
Explanation: Zygote best fits the biological mechanism or definition being tested here; the alternatives describe different structures, processes, or consequences.
Key Concept / Clinical Relevance: The zygote is the first cell of a new organism.
Explanation: ADH increases renal water reabsorption, helping conserve body water.
Key Concept / Clinical Relevance: Hormonal control supports fluid homeostasis.
Explanation: Baroreceptor-mediated autonomic responses rapidly adjust heart rate and vascular tone.
Key Concept / Clinical Relevance: Short-term blood-pressure regulation is neural and rapid.
Explanation: Lactase is an intestinal brush-border enzyme that hydrolyses lactose.
Key Concept / Clinical Relevance: Enzymes catalyse specific biochemical reactions.
Explanation: Increasing cardiac output can partially compensate for reduced arterial oxygen content.
Key Concept / Clinical Relevance: Homeostatic compensation attempts to preserve tissue oxygen delivery.
Explanation: These are classic local manifestations of the inflammatory response.
Key Concept / Clinical Relevance: Inflammation is a coordinated tissue response to injury or infection.
Explanation: Cancer develops through accumulated molecular alterations that permit uncontrolled growth and survival.
Key Concept / Clinical Relevance: Cell-cycle checkpoints and DNA repair protect against cancer.
Explanation: Monoclonal antibodies can selectively recognize molecular targets on cells or soluble mediators.
Key Concept / Clinical Relevance: Modern therapeutics can exploit highly specific molecular recognition.
Explanation: PCR exponentially amplifies a defined DNA target; RNA targets require reverse transcription first.
Key Concept / Clinical Relevance: Nucleic-acid amplification enables sensitive molecular diagnosis.