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Biology MCQs

121 Questions Subject Test
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What is the term for animals lacking a backbone?

  • A Vertebrates
  • B Mammals
  • C Amphibians
  • D Invertebrates
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What is the term for all the organisms of the same species living in the same area at the same time?

  • A Community
  • B Ecosystem
  • C Population
  • D Biome
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What happens to enzyme activity when temperature rises significantly above its optimum?

  • A Activity slows gradually then speeds up
  • B Activity remains constant
  • C Enzyme is denatured and loses activity
  • D Enzyme replicates to compensate
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Which vitamin is essential for the clotting of blood?

  • A Vitamin A
  • B Vitamin C
  • C Vitamin E
  • D Vitamin K
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What is the term for species that have adapted to survive in extremely harsh environments?

  • A Extremophiles
  • B Endemic species
  • C Invasive species
  • D Keystone species
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Which structure in the cell is responsible for protein synthesis?

  • A Mitochondria
  • B Ribosome
  • C Golgi apparatus
  • D Lysosome
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Which process converts atmospheric nitrogen into a usable form for plants?

  • A Photosynthesis
  • B Respiration
  • C Nitrogen fixation
  • D Transpiration
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How many kingdoms are in the traditional five-kingdom system of classification?

  • A Three
  • B Five
  • C Four
  • D Six
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What is the term for organisms that can make their own food?

  • A Heterotrophs
  • B Autotrophs
  • C Decomposers
  • D Parasites
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Which process converts mRNA information into a protein sequence at ribosomes?

  • A Transcription
  • B Translation
  • C Replication
  • D Transduction
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What is the term for organisms that feed on both plants and animals?

  • A Herbivores
  • B Carnivores
  • C Decomposers
  • D Omnivores
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What is the deficiency disease caused by lack of Vitamin C?

  • A Beriberi
  • B Pellagra
  • C Scurvy
  • D Rickets
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Which gas do fish primarily extract from water using their gills?

  • A Oxygen
  • B Carbon dioxide
  • C Nitrogen
  • D Hydrogen
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Which blood type is considered the universal donor?

  • A A
  • B O negative
  • C B
  • D AB
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What is the term for organisms that can make their own food through photosynthesis?

  • A Decomposers
  • B Consumers
  • C Heterotrophs
  • D Autotrophs
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Which reproductive method involves the fusion of male and female gametes?

  • A Asexual reproduction
  • B Budding
  • C Sexual reproduction
  • D Binary fission
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Which vitamin is produced when human skin is exposed to sunlight?

  • A Vitamin A
  • B Vitamin C
  • C Vitamin D
  • D Vitamin K
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Which type of nutrition involves organisms that feed on dead and decaying organic matter?

  • A Saprotrophic
  • B Autotrophic
  • C Holozoic
  • D Parasitic
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What is the term for a genetically determined characteristic passed from parent to offspring?

  • A Trait
  • B Mutation
  • C Phenotype
  • D Adaptation
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What is the term for the symbiotic relationship where one organism benefits and the other is neither helped nor harmed?

  • A Mutualism
  • B Parasitism
  • C Amensalism
  • D Commensalism
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