Transcript Notes: Falsifiability, Pharmacology, and Fetal-Maternal Microchimerism

1. Introduction to Biology

  • Biology is the scientific study of life.

  • Key characteristics of living organisms:

    • Order

    • Reproduction

    • Growth and development

    • Energy processing

    • Response to the environment

    • Regulation (homeostasis)

    • Evolutionary adaptation

1.1 Levels of Biological Organization

  • Life can be studied at different levels, from the microscopic to the global:

    1. Molecules: Chemical structures like DNA.

    2. Organelles: Components within cells (e.g., mitochondria).

    3. Cells: Fundamental unit of life.

      • Prokaryotic (bacteria, archaea)

      • Eukaryotic (protists, fungi, animals, plants)

    4. Tissues: Groups of similar cells performing a specific function.

    5. Organs: Structures made of multiple tissues working together.

    6. Organ Systems: Groups of organs working together.

    7. Organisms: Individual living things.

    8. Populations: Groups of individuals of the same species in an area.

    9. Communities: All organisms in an area.

    10. Ecosystems: All living and non-living factors in an area.

    11. Biosphere: All of Earth's ecosystems.

1.2 Core Concepts in Biology

  • Evolution: The process of change over time that has resulted in the astounding array of organisms found on Earth.

    • Natural selection is a primary mechanism of evolution.

    • Genetic variation is essential for evolution.

  • Structure and Function: The close relationship between how a biological component is built and what it does.

    • Example: The shape of an enzyme's active site (structure) dictates which substrate it can bind to (function).

  • Information Flow: Genetic information (DNA) is inherited and expressed.

    • Central dogma: DNA→RNA→ProteinDNA \rightarrow RNA \rightarrow Protein

    • Genetic code is universal.

  • Energy and Matter: Life requires energy transfer and transformation.

    • Photosynthesis: 6CO<em>2+6H</em>2O+Light Energy→C<em>6H</em>12O<em>6+6O</em>26CO<em>2 + 6H</em>2O + \text{Light Energy} \rightarrow C<em>6H</em>{12}O<em>6 + 6O</em>2

    • Cellular Respiration: C<em>6H</em>12O<em>6+6O</em>2→6CO<em>2+6H</em>2O+ATPC<em>6H</em>{12}O<em>6 + 6O</em>2 \rightarrow 6CO<em>2 + 6H</em>2O + \text{ATP}

  • Interactions: Organisms interact with each other and their environment.