Chapter 1 | BIO 110

Overview of the Course

  • First class date: Aug. 15, 2024
  • Syllabus review and Canvas usage
  • Pre-test due: Aug. 16 at 10 pm
  • No labs for first two weeks; complete online lab safety module before Aug. 28
  • Start with Chapter 1 (PowerPoint available on Canvas)

The Science of Biology

  • Definition: Biology is the scientific study of life.
  • Unifies much of natural science, focusing on complex chemical systems that make up living organisms.
  • Biology intersects with multiple disciplines, enhancing collaborative research initiatives.
  • Life resists simple definitions due to its complexity.

Characteristics of Living Organisms

  • Key features include:
    1. Cellular organization
    2. Ordered complexity
    3. Sensitivity to stimuli
    4. Growth, development, and reproduction
    5. Energy utilization
    6. Homeostasis maintenance
    7. Evolutionary adaptation

Hierarchical Organization of Life

  • Cellular Level:
    • Composed of atoms → molecules → macromolecules → organelles → cells (basic unit of life)
  • Organismal Level:
    • Levels include tissues → organs → organ systems → organism
  • Populational Level:
    • Involves species → community → ecosystem → biosphere

The Nature of Science

  • Aims to understand the natural world via observation and reasoning.
  • Science is descriptive, relying on systematic investigation to address natural phenomena.

Scientific Inquiry

  • Involves critical thinking and reasoning:
    • Deductive reasoning: General principles lead to specific conclusions.
    • Inductive reasoning: Specific observations inform general principles.

Hypothesis Testing

  • Hypothesis: Testable explanation for observations.
  • Iterative nature allows for refinement with new data.
  • Experiments should isolate one variable for clarity in results.
  • Null hypothesis: Assumes no effect or relationship exists; has to be tested.
  • Alternative hypothesis: Proposes that a relationship does exist.

Scientific Theories and Laws

  • Scientific theory: A broad explanation, supported by extensive evidence and reasoning (e.g., gravity, evolution).
  • Law: Descriptions of observed natural phenomena that are consistently validated through testing.

Research Classifications

  • Basic Research: Advances fundamental knowledge.
  • Applied Research: Uses foundational knowledge to solve practical problems (e.g., drug development).

Evolutionary Biology

  • Charles Darwin's theory emphasized natural selection as a mechanism for evolution.
  • Evidence supporting evolution:
    • Comparative anatomy: homologous structures suggest common ancestry.
    • Fossil record: sequential evidence of life forms across geologic time.
    • Developmental patterns: shared embryonic traits reveal evolutionary relationships.
    • Molecular evidence: genetic similarities across species indicate shared origins.

Biodiversity and Unified Life

  • Life's diversity results from evolutionary changes over time by natural selection.
  • Unity underlies the biochemical and genetic makeup across all living organisms.
  • Organisms categorized into three domains: Bacteria, Archaea, and Eukarya.

Research and Evidence in Biology

  • Conduct experiments to gather measurable, observable, and repeatable data to understand biological concepts.
  • Investigate relationships, evolutionary history, and organismal functions using scientific methodologies and reasoning.