Utah Education Network
Uen: Themepark: Cycles
This is a large collection of resources on cycles of nature and the Earth. There is a constant exchange of the elements between air, earth, water, plants, and animals. Most biological processes wind up back where they started. These...
McGraw Hill
Glencoe Biology: Cycling of Matter: Self Check Quiz
Try these five multiple-choice questions about the cycling of matter. Each question has a clickable hint prompt as well as a self-checking feature.
Khan Academy
Khan Academy: Phases of the Cell Cycle
Article explores the life cycle of a cell and delves into the phases of the cell cycle.
Khan Academy
Khan Academy: Cell Cycle Checkpoints
Learn how cells use checkpoints to regulate the cell cycle. This article provides an overview of cell cycle control, outlining the factors that influence a cell's decision to pause or progress at each checkpoint.
Khan Academy
Khan Academy: Cell Cycle Regulators
This article looks at a few of the most important core cell cycle regulators: proteins called cyclins, enzymes called Cdks, and an enzyme complex called the APC/C.
Khan Academy
Khan Academy: Cancer and the Cell Cycle
Article takes a look at how cancer develops and what's wrong with cancer cells. Also, delves into how abnormal forms of cell cycle regulators can contribute to cancer.
Department of Defense
Do Dea: Biology: Unit 3: Cell Structure
In this third unit of a Biology course, students learn about cells and cell structure. They compare prokaryotic and eukaryotic cells and learn about the specialized structures in a cell and what their functions are. They will also learn...
Khan Academy
Khan Academy: The Citric Acid Cycle
Resource provides an overview of the steps of the citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle. Gives detailed examples of how this amazing cycle works and discusses the products of the cycle.
Vision Learning
Visionlearning: Earth Science: The Carbon Cycle: What Goes Around Comes Around
Instructional module focusing on the carbon cycle. Discussion includes the biological and geological components of how carbon moves through the atmosphere, lithosphere, and hydrosphere. Site also includes an interactive practice quiz and...
CK-12 Foundation
Ck 12: Krebs Cycle
[Free Registration/Login may be required to access all resource tools.] After studying the Krebs Citric Acid Cycle, students will be able to identify what happens to the product of glycolysis and explain the steps and results of the cycle.
Khan Academy
Khan Academy: The Calvin Cycle
Learn about the three stages of the Calvin Cycle reactions: carbon fixation, reduction, and regeneration of the starting molecule. See how the products of the light reactions, ATP and NADPH, are used to fix carbon into sugars in this cycle.
CK-12 Foundation
Ck 12: Episd: Water Cycle
[Free Registration/Login may be required to access all resource tools.] An introduction to the biogeochemical cycle, the water cycle. Recognize evaporation, sublimation, and condensation. Identify groundwater and runoff water supplies.
Other
Curriki: Butterfly Life Cycle Lesson Plan
Project to learn about the life cycle of a butterfly and how the caterpillar becomes to be a butterfly.
CK-12 Foundation
Ck 12: Episd: Carbon Cycle
[Free Registration/Login may be required to access all resource tools.] Students will explore through this introduction to the carbon cycle.
CK-12 Foundation
Ck 12: Episd: Nitrogen Cycle
[Free Registration/Login may be required to access all resource tools.] Students will be introduced to the nitrogen cycle.
CK-12 Foundation
Ck 12: Calvin Cycle
[Free Registration/Login may be required to access all resource tools.] The second stage of photosynthesis, the Calvin Cycle, is described. Students will learn how to write the overall photosynthesis equation, explain RuBisCo, describe...
CK-12 Foundation
Ck 12: Cell Cycle and Cancer
[Free Registration/Login may be required to access all resource tools.] Cell division is just one of several stages that a cell goes through during its lifetime. Students will learn about the phases of the cell cycle, specifically the...
Biology Pages
Kimball's Biology Pages: The Nitrogen Cycle
An overview of the nitrogen cycle, covering nitrogen fixation, decay, nitrification, denitrification, and more.
CK-12 Foundation
Ck 12: Biology: Plant Life Cycle Overview
[Free Registration/Login may be required to access all resource tools.] Introduction to the alternation of generations, a life cycle characteristic of all plants.
CK-12 Foundation
Ck 12: Biology: Calvin Cycle
[Free Registration/Login may be required to access all resource tools.] Describes the Calvin cycle, the second stage of photosynthesis.
CK-12 Foundation
Ck 12: Biology: Water Cycle
[Free Registration/Login may be required to access all resource tools.] Covers the water cycle.
CK-12 Foundation
Ck 12: Biology: Plant Life Cycles
[Free Registration/Login may be required to access all resource tools.] Discusses the general life cycle of plants.
University of Illinois
University of Illinois: Illinois State Water Survey: Simplified Nitrogen Cycle
A semi-technical description of the nitrogen cycle. Contains a link to an abridged version of the page along with a list of further resources on the topic.
BiologyWise
Biology Wise: Information About Nitrifying and Denitrifying Bacteria
Learn about the important role that nitrifying and denitrifying bacteria play in the nitrogen cycle.