An organism that gets their energy for electron transfer from light, as suggested by the prefix photo- ("light"). 

Phototroph

An organism that gets their energy for electron transfer from breaking chemical bonds, as suggested by the prefix chemo- ("chemical").

Chemotroph

Organisms can be classified by the energy sources they use. Some such examples include:

- Phototrophs
- Chemotrophs

University of Notre Dame

Metabolism

OpenStax Concepts of Biology provides the necessary breadth and depth for core Biology concepts.

Link: https://openstax.org/details/books/concepts-biology/

OpenStax Biology 2nd Edition

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

A classification framework designed to organize vast amounts of knowledge using fundamental concepts, with a focus on developing categories for business activities, though applicable to various other types of activities.

Classification Framework of Supermind Ontology

The Periodic Table of the Elements, designed by Mendeleev in 1869, is a widely known and successful classification system. Mendeleev's table predicted the existence and properties of undiscovered elements and ruled out the existence of others.

Periodic Table of the Elements

The International Classification of Diseases (ICD), published by the World Health Organization (WHO), is a major classification system for diseases that is recognized globally. Originating in Europe after World War II, the ICD has undergone multiple revisions, similar to the DSM. While it is used for clinical diagnosis and shares similarities with the DSM in its categories and criteria for psychological disorders, it also serves broader public health functions. These include monitoring the overall health of populations and tracking the international prevalence of various diseases and health issues.

International Classification of Diseases (ICD)

The system biologists use to classify living organisms, inspired by the hierarchical classification first proposed by Linnaeus in 1758. It provides a standard nomenclature for describing species, organizes information about different species, and serves as a basis for generalization in comparative studies.

Biological Classification System

Organisms can be classified by the carbon sources they use for metabolism. Some such examples include:

- Autotrophs
- Heterotrophs

Organism Classification by Carbon Source

Important catalysts for metabolic reactions in cells; Enzymes speed up reaction times by lowering a reaction's activation energy.

Enzymes

Organisms power cellular functions via the transfer of electrons between molecules, allowing for the incremental release and use of stored energy. 

Electron Transfer in Metabolism

The stepwise, interconnected chemical reactions that underlie cellular processes

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