Introduction to Biology

Assignment Due Date

  • Ensure completion of assignments by the end of the day on Friday for Boyd.

  • Late submissions will incur an 80% maximum score.

Technology Access and Communication

  • Check for issues accessing Blackboard or similar platforms.

  • Importance of safety during snowstorm emphasized.

  • Reminder about signing up for warning notifications.

Overview of Chapter One: Biology

  • Focus on the scientific study of life, defined as biology.

  • Chapter aims to enhance understanding of fundamental biological terms.

Understanding Terminology in Biology

  • Biology: From Greek, "bio" (life) and "ology" (study of). Thus, biology means the study of life.

  • The study of various life forms, including plants, animals, microorganisms, fungi, etc.

Importance of Studying Biology

  • Interactions with daily life:

    • Understanding medical treatments and implications in personal health.

    • Awareness of the environmental impact of human actions.

  • Ethical implications of biological studies:

    • Topics include vaccine mandates, implications of stem cell research, genetically modified organisms (GMOs), and conservation efforts.

Defining Life: Criteria and Assessments

  • Comprehending what constitutes living entities through a classroom exercise:

    • Evaluating various objects (e.g., rock, tree, skeleton, virus, E. coli, etc.) to determine their living status.

Key Definitions:

  • Organism: Any individual living thing.

    • All living things comprise one or more cells.

    • Unicellular: Organisms with one cell (e.g., bacteria).

    • Multicellular: Organisms with multiple cells (e.g., plants, animals).

Fundamental Components of Life

  1. Organized Structure:

    • Life is systematically organized from atoms to organisms.

    • Atoms: Smallest unit of matter; bonds form molecules.

      • Layer of complexity: Molecules form macromolecules (e.g., DNA).

    • Cells: Basic unit of life; cells organized into tissues, organs, organ systems, and finally organisms.

  2. Energy Usage:

    • Organisms need to obtain and utilize energy for processes (metabolism).

    • Autotrophs: Organisms that produce their own energy through photosynthesis (e.g., plants).

    • Heterotrophs: Organisms that consume other sources for energy (e.g., animals).

      • Decomposers: A type of heterotroph that feeds on dead organisms.

    • Energy transfer is inefficient, resulting in energy loss at each trophic level (up to 90% loss).

  3. Homeostasis:

    • Maintaining internal balance (e.g., temperature regulation).

    • Example: Human body temperature regulated at approximately 98.6 degrees Fahrenheit.

  4. Reproduction and Development:

    • Life must reproduce to pass genetic information (heredity).

    • Asexual Reproduction: One parent produces genetically identical offspring (e.g., bacteria).

    • Sexual Reproduction: Genetic material from two parents combines, leading to variation (e.g., mammals).

    • Growth: Development and maturation of organisms.

  5. Evolution:

    • Populations evolve over time; this is a process of natural selection.

    • Genetic variation is crucial for adaptation to changing environments.

    • Examples: Antibiotic resistance in bacteria and adaptation of species.

Clarifying Living vs. Non-Living

  • Using class examples:

    • Rock: Not alive - fails to meet criteria for energy use, reproduction, maintenance of internal constancy.

    • Tree: Alive - fulfills all criteria.

    • Skeleton: Not alive - lacks energy usage, cannot reproduce.

    • Virus (SARS CoV-2): Not alive - does not have cells and does not generate its own energy; relies on a host.

    • E. coli: Alive - fulfills all five criteria.

    • Moldy bread: Alive - the mold itself is alive, while the bread is not.

Classification of Life

  • Levels of Biological Classification:

    • Domains (broadest) to Species (narrowest):

      • Domain: Bacteria, Archaea, Eukarya

      • Kingdom: E.g., Chordata (humans), Animalia (multicellular, heterotrophic organisms).

    • Hierarchical order:

      • Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species.

    • Example for humans:

      • Domain: Eukarya, Kingdom: Animalia, Phylum: Chordata, Class: Mammalia, Order: Primates, Family: Hominidae, Genus: Homo, Species: sapiens.

    • E. coli example: Genus: Escherichia, Species: coli.

Scientific Method

  • An empirical framework for conducting scientific inquiries:

    1. Observation: Identify an intriguing phenomenon.

    2. Question: Formulate a question based on the observation.

    3. Research: Review existing literature and research.

    4. Hypothesis: Make an educated guess.

    5. Prediction: Formulate a testable prediction based on the hypothesis.

    6. Experiment: Design and conduct experiments to gather data.

    7. Data Analysis: Assess the data for trends and insights.

    8. Peer Review: Submit findings for evaluation by other scientists to ensure robustness and reliability.

Experiment Design Elements

  • Independent Variable: The factor manipulated during the experiment.

  • Dependent Variable: The outcome measured in response to the independent variable.

  • Standardized Variables (Controls): Conditions that remain constant throughout the experiment to ensure valid results.

Conclusion

  • Understanding biological concepts is crucial for navigating discussions surrounding ethical implications of scientific research (e.g., vaccine mandates, GMOs).

  • The scientific method provides a structured approach to inquiry, essential for advancing biological knowledge.