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General Biology I - Chapter 1 Key Concepts

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  • Seven properties common to all life

    Order, regulation, growth and development, energy processing, response to environment, reproduction, and evolutionary adaptation are the seven properties common to all life.

  • Three domains of life

    The three domains are Bacteria, Archaea, and Eukarya, differing in cell type and genetics.

  • Levels of biological organization

    From smallest to largest: molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

  • Emergent properties

    New properties that arise at each level of biological organization due to interactions among components.

  • Steps of the scientific method

    Observation, question, hypothesis, prediction, experiment, analysis, conclusion.

  • Structure of a controlled experiment

    Includes an independent variable manipulated, a dependent variable measured, and control groups for comparison.

  • Artificial selection

    Human-directed breeding to select for desired traits in organisms.

  • Biology

    The scientific study of life and living organisms.

  • Biosphere

    All ecosystems on Earth where life exists.

  • Cell

    The basic unit of life in all living organisms.

  • Community

    All populations of different species living and interacting in an area.

  • Controlled experiment

    An experiment that tests a hypothesis by changing one variable while keeping others constant.

  • Data

    Recorded observations and measurements from experiments.

  • Dependent variable

    The measured outcome that responds to changes in the independent variable.

  • Domain

    The highest taxonomic rank grouping organisms by cell type and genetics.

  • Ecosystem

    A community of organisms and their physical environment interacting as a system.

  • Evolution

    Change in genetic composition of populations over generations.

  • Gene

    A segment of DNA that codes for a specific protein or trait.

  • Gene expression

    The process by which information from a gene is used to produce a functional product, like a protein.

  • Hypothesis

    A testable explanation for a scientific question.

  • Independent variable

    The factor manipulated in an experiment to test its effect.

  • Molecule

    Two or more atoms bonded together forming the chemical basis of life.

  • Natural selection

    The process where organisms better adapted to their environment tend to survive and reproduce.

  • Organ

    A structure composed of multiple tissues performing a specific function.

  • Organ system

    A group of organs working together to perform a body function.

  • Organelle

    A specialized structure within a cell that performs a specific function.

  • Organism

    An individual living entity.

  • Population

    A group of individuals of the same species living in an area.

  • Science

    A systematic approach to understanding the natural world through observation and experimentation.

  • Systems biology

    The study of interactions among components of biological systems.

  • Technology

    Application of scientific knowledge for practical purposes.

  • Theory

    A well-supported explanation of natural phenomena based on evidence.

  • Tissue

    A group of similar cells performing a common function.