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Biology MCQs

58 Questions Subject Test
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Cell BiologyHuman PhysiologyGeneticsEcology
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Which process by which bacteria take up free DNA from their environment was discovered by Griffith?

  • A Transformation
  • B Conjugation
  • C Transduction
  • D Translation
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Correct Answer: Option A — Transformation
Explanation: Transformation is the process by which bacteria take up and incorporate free DNA from their environment first demonstrated by Frederick Griffith in 1928 using Streptococcus pneumoniae.
Submitted by: PaperMCQs
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What is the process by which bacteria exchange genetic material through direct contact?

  • A Transformation
  • B Transduction
  • C Conjugation
  • D Replication
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Correct Answer: Option C — Conjugation
Explanation: Conjugation is the process by which bacteria transfer genetic material including plasmids through direct physical contact via a structure called a pilus contributing to antibiotic resistance spread.
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What is the term for the genetic makeup of an organism?

  • A Phenotype
  • B Karyotype
  • C Genotype
  • D Genome
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Correct Answer: Option C — Genotype
Explanation: Genotype refers to the complete set of genetic information or alleles present in an organism that determines its inherited traits and potential phenotypic characteristics.
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What is the term for the process by which cells divide to form gametes?

  • A Meiosis
  • B Mitosis
  • C Binary fission
  • D Budding
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Correct Answer: Option A — Meiosis
Explanation: Meiosis is a specialized cell division process that produces gametes with half the chromosome number of the parent cell. This reduction ensures that offspring receive the correct chromosome number after fertilization occurs.
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What is the role of helper T cells in coordinating the immune response?

  • A Producing antibodies directly
  • B Destroying infected cells
  • C Activating B cells and cytotoxic T cells
  • D Engulfing pathogens
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Correct Answer: Option C — Activating B cells and cytotoxic T cells
Explanation: Helper T cells also called CD4 T cells coordinate the immune response by releasing cytokines that activate B cells to produce antibodies and stimulate cytotoxic T cells to destroy infected cells.
Submitted by: PaperMCQs
46
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What is the functional unit of the kidney responsible for filtration of blood?

  • A Glomerulus
  • B Loop of Henle
  • C Bowman's capsule
  • D Nephron
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Correct Answer: Option D — Nephron
Explanation: The nephron is the basic structural and functional unit of the kidney responsible for filtering blood regulating water and electrolyte balance and producing urine.
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Which plant hormone is primarily responsible for stem elongation and phototropism?

  • A Cytokinin
  • B Gibberellin
  • C Ethylene
  • D Auxin
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Correct Answer: Option D — Auxin
Explanation: Auxin is a plant hormone that regulates growth by promoting cell elongation, particularly in stems. It also controls phototropism, causing plants to bend toward light sources by stimulating faster growth on the shaded side.
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48
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What is the process by which white blood cells engulf and digest bacteria and foreign particles?

  • A Phagocytosis
  • B Endocytosis
  • C Osmosis
  • D Pinocytosis
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Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is the process by which phagocytes such as neutrophils and macrophages engulf and digest bacteria foreign particles and dead cells protecting the body from infection.
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49
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What is the process by which cells engulf large particles by wrapping the cell membrane around them?

  • A Phagocytosis
  • B Osmosis
  • C Diffusion
  • D Pinocytosis
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Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is a type of endocytosis where the cell membrane wraps around large solid particles such as bacteria and engulfs them forming a phagosome inside the cell.
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50
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Which part of the digestive system primarily absorbs nutrients into the bloodstream?

  • A Stomach
  • B Large intestine
  • C Small intestine
  • D Esophagus
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Correct Answer: Option C — Small intestine
Explanation: The small intestine, lined with finger-like projections called villi, provides a large surface area for absorbing digested nutrients including carbohydrates, proteins, and fats directly into the bloodstream for distribution throughout the body.
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51
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Which plant hormone signals guard cells to close stomata during drought conditions?

  • A Abscisic acid
  • B Auxin
  • C Gibberellin
  • D Cytokinin
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Correct Answer: Option A — Abscisic acid
Explanation: Abscisic acid ABA is a plant stress hormone that signals guard cells surrounding stomata to close during drought conditions reducing water loss through transpiration.
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What is the term for the sum of all chemical reactions occurring within an organism?

  • A Metabolism
  • B Homeostasis
  • C Catabolism
  • D Anabolism
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Correct Answer: Option A — Metabolism
Explanation: Metabolism encompasses all chemical reactions occurring within a living organism, including both the breakdown of molecules to release energy and the building of complex molecules necessary for growth, repair, and cellular function.
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53
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What is the broadest level of biological classification?

  • A Domain
  • B Order
  • C Family
  • D Kingdom
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Correct Answer: Option A — Domain
Explanation: Domain is the broadest level in the modern biological classification system above kingdom and includes three domains Bacteria Archaea and Eukarya.
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54
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Which process copies DNA information into mRNA in the nucleus?

  • A Translation
  • B Replication
  • C Transduction
  • D Transcription
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Correct Answer: Option D — Transcription
Explanation: Transcription is the process by which the information in a DNA sequence is copied into mRNA by the enzyme RNA polymerase taking place in the nucleus of eukaryotic cells.
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Which organelle within the nucleus is responsible for producing ribosomal RNA?

  • A Centrosome
  • B Nucleolus
  • C Centriole
  • D Golgi body
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Correct Answer: Option B — Nucleolus
Explanation: The nucleolus is a dense region within the nucleus responsible for producing ribosomal RNA and assembling ribosome subunits that are then exported to the cytoplasm for protein synthesis.
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56
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What is the term for the variety of different species present in a given habitat?

  • A Genetic diversity
  • B Species diversity
  • C Ecosystem diversity
  • D Biodiversity
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Correct Answer: Option B — Species diversity
Explanation: Species diversity refers to the number and relative abundance of different species present in a given habitat and is an important measure of the biodiversity of an ecosystem.
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What is the term for a substance that speeds up chemical reactions in living organisms?

  • A Enzyme
  • B Hormone
  • C Vitamin
  • D Antibody
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Correct Answer: Option A — Enzyme
Explanation: Enzymes are biological catalysts, mostly proteins, that speed up specific chemical reactions without being consumed in the process. They lower the activation energy required for reactions, enabling essential metabolic processes to occur efficiently.
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Which organ system includes the lungs and is responsible for gas exchange?

  • A Respiratory system
  • B Circulatory system
  • C Digestive system
  • D Nervous system
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Correct Answer: Option A — Respiratory system
Explanation: The respiratory system, including the lungs, trachea, and bronchi, facilitates the exchange of oxygen and carbon dioxide between the body and the atmosphere, supplying oxygen needed for cellular respiration and removing waste gas.
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