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Key Concepts

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  • What is biology?

    Biology is the scientific study of life, characterized by properties such as order, reproduction, growth, energy processing, regulation, response to the environment, and evolutionary adaptation.

  • What are the seven properties common to all life?

    Order, reproduction, growth and development, energy processing, regulation, response to the environment, and evolutionary adaptation.

  • What is the structural and functional unit of life?

    The cell is the fundamental structural and functional unit of life.

  • How is life organized in taxonomy?

    Life is classified into three domains: Bacteria, Archaea (both with simple cells), and Eukarya (including protists and kingdoms Fungi, Plantae, and Animalia).

  • What is an emergent property in biology?

    Emergent properties arise from the specific arrangement and interactions of parts at each level of biological organization.

  • List the hierarchy of biological organization from smallest to largest.

    Atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, biosphere.

  • What is the scientific method?

    A process involving observation, hypothesis formation, prediction, experimentation or further observation, and data analysis to understand natural phenomena.

  • What is the difference between independent and dependent variables in an experiment?

    The independent variable is manipulated; the dependent variable is measured and depends on the independent variable.

  • What is a controlled experiment?

    An experiment comparing an experimental group with a control group to test the effect of a single variable.

  • What is the core theme of biology?

    Evolution is the core theme, explaining the unity and diversity of life through natural selection and descent with modification.

  • How does evolution impact everyday life?

    Evolutionary theory informs medicine, conservation, agriculture, and explains artificial selection in crops and livestock.

  • What role does DNA play in life?

    DNA stores hereditary information and programs cellular activities by encoding proteins.

  • How are structure and function related in biology?

    At all levels, the structure of a biological component correlates with its function, e.g., protein shape determines its role.

  • Describe the flow of energy in an ecosystem.

    Energy flows one way: sunlight → producers → consumers → heat loss.

  • How is matter cycled in ecosystems?

    Matter cycles between the atmosphere, soil, producers, consumers, decomposers, and back to the environment.

  • What is systems biology?

    An approach to model biological systems by analyzing interactions among their parts to understand emergent properties.

  • What are the three domains of life?

    Bacteria, Archaea, and Eukarya.

  • Name the kingdoms within the domain Eukarya.

    Protists, Fungi, Plantae, and Animalia.

  • What is the taxonomic hierarchy from broadest to most specific?

    Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

  • What is the significance of a scientific theory?

    A scientific theory is a broad explanation supported by a large body of evidence.