Introduction to Biology: Scientific Inquiry and Characteristics of Life

Introductory Biology for Non-Science Majors

Course Overview

This course introduces fundamental concepts in biology for students without a science background. It covers the scientific method, characteristics of life, and major themes in biology, with examples from local ecosystems such as the rivers of Alabama.

The Process of Science

What is Science?

• Science is both a way of knowing and a body of knowledge derived from systematic inquiry.

• The word "science" comes from the Latin verb meaning "to know."

Forms of Scientific Inquiry

• Discovery (Exploratory) Science: Uses inductive reasoning to describe natural structures and processes.

• Hypothesis-Based Science: Uses deductive reasoning to test predictions derived from hypotheses.

The Scientific Method

• Observations lead to questions.

• Questions lead to hypotheses (tentative, testable explanations).

• Hypotheses are often stated as "If, then" statements.

• Hypotheses are tested by observation or experimentation.

• Hypotheses may be modified based on results.

Example: If a flashlight does not work, possible hypotheses include dead batteries or a burnt-out bulb. Testing each hypothesis by replacing the batteries or bulb helps determine which is supported by evidence.

Important Note: Science does not "prove" hypotheses; it gathers evidence that supports or fails to support them.

Theories in Science

• A theory is broader in scope than a hypothesis and is supported by extensive, varied evidence.

• Theories arise from multiple related hypotheses.

• Examples in biology: Cell Theory, Evolution by Natural Selection.

• Theories can be changed if new evidence arises, but this is rare.

Collaboration and Communication in Science

• Modern science is often collaborative, involving teamwork.

• Scientific knowledge is shared through peer-reviewed journals, science magazines, and general interest publications.

Evaluating Scientific Information

• Consider the quality of observations, the scientists' credentials, and potential biases.

• Replication by other scientists is crucial for reliability.

• Recentness and convergence of evidence from different fields strengthen scientific claims.

Science, Technology, and Society

Interdependence of Science and Technology

• Science seeks to understand natural phenomena.

• Technology applies scientific knowledge for practical purposes.

• Advances in one often drive progress in the other, creating a feedback loop.

Limits of Science

• Scientists are subject to human biases and errors.

• Genuine science should consider contradictory evidence and avoid "argument from authority."

• Scientific integrity requires transparency and openness to new data.

Biology: The Study of Life

Defining Life

According to the scientific community, living organisms possess the following eight characteristics simultaneously:

• Order: Organized structure and function.

• Regulation: Maintenance of internal stability (homeostasis).

• Growth and Development: Increase in size and complexity over time.

• Energy Processing: Acquisition and use of energy to maintain order.

• Response to the Environment: Reacting to external stimuli.

• Reproduction: Producing offspring, either sexually or asexually.

• Evolution: Populations change over time through natural selection and other mechanisms.

• Cells: Composed of one or more cells, the basic unit of life.

Example: Warm-blooded animals (e.g., mammals) regulate their internal temperature, while cold-blooded animals (e.g., lizards) depend on environmental heat sources.

Major Themes in Biology

• Interconnections within Systems: Biological systems are interconnected at molecular, cellular, organismal, and ecological levels.

• Evolution: The unifying theme explaining the diversity and adaptation of life.

Course Modules

• Modules 1-3: Molecular and cellular biology.

• Module 4: Ecology and evolution.

Case Study Example: Rivers of Alabama

Local Biodiversity

• Alabama is home to a biological "hotspot," with diverse species such as sturgeon found in local rivers.

• Example: Female Gulf sturgeon captured and released in Mobile Bay, highlighting local conservation efforts.