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Chapter 1: Introduction to Biology

Difficulty Level: At Grade Created by: CK-12
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Is there a way to define life?

Scientifically, there is an actual definition of life. Living organisms must have certain characteristics. If they do not have these characteristics, are they living? This butterfly, like all other insects, animals, plants, and every other living organism, shares common characteristics with all life. What exactly does it mean to be alive? This chapter will answer this question. These lessons will serve as an introduction to biology, discussing basic Fundamental Concepts of Science and the Chemistry of Life.

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Chapter Summary


The scientific method is the process by which biological information, like that of all other sciences, has been identified. This has resulted in a number of important biological scientific theories, including the cell theory and the theory of evolution. All life is built around carbon, and four categories of organic compounds: carbohydrates, lipids, proteins, and nucleic acids. One particular type of protein, enzymes, are biological catalysts, allowing biochemical reactions to proceed at the rate necessary to maintain life. One other molecule, water, is also essential to life, though water is not an organic compound.

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Difficulty Level:
At Grade
Date Created:
Feb 24, 2012
Last Modified:
Jan 14, 2016
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