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Biology MCQs

121 Questions Subject Test
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Build a clear understanding of living organisms, cells, genetics, human systems and the environment through carefully selected practice questions.

Cell BiologyHuman PhysiologyGeneticsEcology
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What is the term for an organism capable of living both on land and in water?

  • A Reptile
  • B Mammal
  • C Fish
  • D Amphibian
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Correct Answer: Option D — Amphibian
Explanation: Amphibians, such as frogs and salamanders, typically begin life in water as larvae with gills before metamorphosing into air-breathing adults capable of living on land, though many still require moisture to survive.
Submitted by: PaperMCQs
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What is the two-part Latin naming system for organisms called?

  • A Phylogenetic classification
  • B Binomial nomenclature
  • C Cladistics
  • D Linnaean classification
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Correct Answer: Option B — Binomial nomenclature
Explanation: Binomial nomenclature is the formal system of naming organisms using two Latin words the genus name and the species name developed by Carl Linnaeus in the 18th century.
Submitted by: PaperMCQs
83
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What is the chemical messenger secreted by endocrine glands into the bloodstream called?

  • A Hormone
  • B Enzyme
  • C Neurotransmitter
  • D Antibody
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Correct Answer: Option A — Hormone
Explanation: Hormones are chemical messengers secreted by endocrine glands directly into the bloodstream and transported to target organs where they regulate physiological processes.
Submitted by: PaperMCQs
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Which part of the human brain controls balance and coordination?

  • A Cerebrum
  • B Medulla oblongata
  • C Cerebellum
  • D Hypothalamus
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Correct Answer: Option C — Cerebellum
Explanation: The cerebellum, located at the back of the brain, coordinates voluntary movements, posture, and balance. Damage to this region can result in unsteady gait, poor muscle coordination, and difficulty with fine motor tasks.
Submitted by: PaperMCQs
85
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What is the term for a community of organisms interacting with their physical environment?

  • A Biome
  • B Population
  • C Ecosystem
  • D Community
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Correct Answer: Option C — Ecosystem
Explanation: An ecosystem is a biological community of interacting organisms together with the physical environment in which they live including both biotic living and abiotic non-living components.
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What is the term for proteins produced by B lymphocytes in response to specific antigens?

  • A Antigens
  • B Enzymes
  • C Hormones
  • D Antibodies
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Correct Answer: Option D — Antibodies
Explanation: Antibodies also called immunoglobulins are Y-shaped proteins produced by B lymphocytes that specifically bind to antigens neutralising pathogens and marking them for destruction.
Submitted by: PaperMCQs
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What is the term for the group of hormone-secreting glands in the body?

  • A Digestive system
  • B Endocrine system
  • C Excretory system
  • D Lymphatic system
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Correct Answer: Option B — Endocrine system
Explanation: The endocrine system comprises glands including the pituitary, thyroid, adrenal, and pancreas that secrete hormones directly into the bloodstream. These hormones regulate vital processes such as growth, metabolism, mood, and reproductive functions.
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What is the function of lysosomes in animal cells?

  • A Protein synthesis
  • B Digestion of waste materials and cellular debris
  • C Energy production
  • D DNA storage
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Correct Answer: Option B — Digestion of waste materials and cellular debris
Explanation: Lysosomes are membrane-bound organelles containing digestive enzymes that break down waste materials damaged organelles and foreign substances through a process called autophagy.
Submitted by: PaperMCQs
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What is the term for the first stage of the water cycle where water changes to vapor?

  • A Evaporation
  • B Condensation
  • C Precipitation
  • D Infiltration
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Correct Answer: Option A — Evaporation
Explanation: Evaporation occurs when heat energy from the sun causes liquid water from oceans, lakes, and rivers to transform into water vapor, rising into the atmosphere and beginning the continuous cycling of Earth's water resources.
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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.
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What gas do plants absorb from the atmosphere during photosynthesis?

  • A Oxygen
  • B Nitrogen
  • C Carbon dioxide
  • D Hydrogen
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Correct Answer: Option C — Carbon dioxide
Explanation: Plants absorb carbon dioxide through tiny pores called stomata on their leaves. Using sunlight energy, they combine it with water to produce glucose and release oxygen as a byproduct, forming the basis of the food chain.
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Which type of tissue in plants transports dissolved food from leaves to other parts?

  • A Phloem
  • B Cambium
  • C Xylem
  • D Epidermis
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Correct Answer: Option A — Phloem
Explanation: Phloem is the vascular tissue in plants responsible for transporting dissolved sugars and other organic compounds produced during photosynthesis from leaves to all parts of the plant.
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93
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What is the process by which organisms adapt to extreme cold by entering a state of dormancy?

  • A Aestivation
  • B Migration
  • C Dormancy
  • D Hibernation
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Correct Answer: Option D — Hibernation
Explanation: Hibernation is a state of dormancy entered by some animals during cold winter months to conserve energy by lowering metabolic rate body temperature and heart rate.
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Which branch of biology deals with the study of viruses?

  • A Bacteriology
  • B Mycology
  • C Parasitology
  • D Virology
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Correct Answer: Option D — Virology
Explanation: Virology is the branch of biology that studies viruses including their structure classification evolution mechanisms of infection and methods of control.
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What is the term for the variety of life in a particular habitat?

  • A Population
  • B Ecosystem
  • C Community
  • D Biodiversity
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Correct Answer: Option D — Biodiversity
Explanation: Biodiversity refers to the range of species, genetic variation, and ecosystems present in a given area. High biodiversity contributes to ecosystem stability and resilience, providing essential services like pollination, water purification, and climate regulation.
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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.
Submitted by: PaperMCQs
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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 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 part of the eye controls the amount of light entering it?

  • A Retina
  • B Iris
  • C Cornea
  • D Lens
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Correct Answer: Option B — Iris
Explanation: The iris is the colored, muscular part of the eye that adjusts the size of the pupil to regulate light entry. It contracts in bright light and dilates in dim conditions to optimize vision.
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Which part of the human brain is responsible for voluntary movement and higher cognitive functions?

  • A Cerebellum
  • B Medulla oblongata
  • C Cerebrum
  • D Hypothalamus
Permalink
Correct Answer: Option C — Cerebrum
Explanation: The cerebrum is the largest part of the human brain responsible for voluntary movement perception memory language reasoning and other higher cognitive functions.
Submitted by: PaperMCQs
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