What counts as living & Molecules of life Molecules of

Scientific Method and Hypothesis Driven Science

  • Hypothesis Driven Science

    • Involves setting up an experiment based on a hypothesis.

    • Key Components:

    • Proposed hypothesis.

    • Predictions based on the hypothesis.

    • Execution of the experiment.

    • Inclusion of a control group and an experimental group.

  • Scientific Literacy

    • Understands the principles of science, distinguishes between good and bad science.

    • Knowledge of current scientific discoveries and possible breakthroughs.

Biodiversity and Human Health

  • Breakthrough Discoveries from Organisms

    • Untapped potential for discoveries yet to be made in biology.

    • Many species on Earth are not sufficiently studied due to time and funding constraints.

Examples of Medicinal Contributions from Biodiversity

  • Willow Tree

    • Medicine: Aspirin

    • Function: Pain relief and reduces blood pressure.

  • Pit Viper Venom

    • Investigation of its enzymes led to major blood pressure medication.

    • Mechanism: Enzymes in venom act to lower blood pressure, can be modified for safe human use.

  • Cinchona Tree

    • Original treatment for malaria.

    • Modern developments have created alternative treatments for this disease.

  • Gila Monster

    • Source of medication (Ozempic) for diabetes and other conditions.

  • Mold (Penicillin)

    • Discovered accidentally, penicillin revolutionized treatment of bacterial infections.

    • Historical significance: Prior to penicillin, infections often resulted in death after surgery due to lack of effective treatment.

Scientific Literacy and Misinformation

  • Misinformation in Science

    • Anecdotal evidence versus scientifically supported information.

    • Example: Vitamin C for cold treatment is mostly myth; no substantial evidence supports its efficacy in preventing or curing colds.

  • Wakefield Paper

    • Attempted to link vaccines with autism; based on a study with only 12 subjects and found to be falsified.

    • Legitimate research shows no correlation between vaccines and autism.

The Scientific Method Steps

  1. Observation

  2. Question Formulation

  3. Hypothesis Development

    • Must be testable and falsifiable.

  4. Experimentation

    • Example: Testing the hypothesis that cell phone radiation increases cancer incidence.

    • Control versus experimental groups are established.

  5. Prediction

    • Specific expected outcomes based on the hypothesis.

  6. Peer Review and Publication

    • Ensures rigorous scientific scrutiny of findings.

Experimental Design and Controls

  • Importance of using sufficient and logistical test subjects in experiments.

    • Increases reliability of results and reduces anomalies.

  • Control groups should be identical to experimental groups in every way but the variable being tested.

  • Example: In an experiment studying cell phone radiation effects, ensure all other factors remain constant.

Importance of Scientific Theories

  • A scientific theory is built on substantial evidence and is a well-supported explanation of a natural phenomenon.

  • Examples: Cell theory, theory of evolution.

Taxonomy of Living Organisms

  • Living Organisms Classification

    • Classification hierarchy: Domains > Kingdoms > Phyla > Classes > Orders > Families > Genus > Species.

    • Three Domains of Life:

    • Domain Bacteria

    • Domain Archaea

    • Domain Eukarya (includes humans, animals, plants, fungi)

  • Human Taxonomic Classification:

    • Domain: Eukarya

    • Kingdom: Animalia

    • Example of Species: Panthera pardus (Panther, Leopard)

Basic Chemistry Concepts

  • Elements and Atoms

    • An element is a pure substance made of one type of atom.

    • Atoms consist of protons, neutrons, and electrons.

Periodic Table Understanding

  • Atomic Number: Number of protons, defines the element.

  • Atomic Mass: Number of protons plus neutrons.

Subatomic Particles

  • Types of Subatomic Particles

    • Protons: Positively charged.

    • Neutrons: No charge.

    • Electrons: Negatively charged.

  • Stability and Reactivity of Atoms

    • Atoms are stable when outermost electron shell is filled to capacity.

  • Example: Sodium and Chlorine.

Isotopes and Radioisotopes

  • Isotopes

    • Atoms of the same element with different numbers of neutrons.

    • Denotation: Carbon-12, Carbon-13, Carbon-14.

  • Radioisotopes

    • Useful for dating fossils based on decay rates.

    • Example: Carbon dating for newer fossils, Uranium dating for older fossils.

Conclusion and Implications of Biology and Chemistry

  • Understanding these fundamental concepts lays the groundwork for understanding the scientific approach to studying life, biodiversity, and the interactions that characterize living organisms. This framework will be continuously built upon in future modules to illustrate the complexity and interconnectedness of biological systems.