CK-12 Foundation
Ck 12: Life Science: Plant Reproduction and Life Cycle
[Free Registration/Login may be required to access all resource tools.] The life cycle of a plant is very different from the life cycle of an animal. Humans are made entirely of diploid cells (cells with two sets of chromosomes). Our...
CK-12 Foundation
Ck 12: Life Science: Nitrogen Cycle
[Free Registration/Login may be required to access all resource tools.] Like water and carbon, nitrogen is also repeatedly recycled through the biosphere. This process is called the nitrogen cycle. Learn more about the nitrogen cycle in...
BiologyWise
Biology Wise: Nitrogen Cycle Steps
Nitrogen is essential to all living things. This article explains what the nitrogen cycle is and the five steps involved in it.
Khan Academy
Khan Academy: Biogeochemical Cycles Review
Review information on the cycling of matter throughout the spheres of Earth.
CK-12 Foundation
Ck 12: Life Science: Insect Reproduction and Life Cycle
[Free Registration/Login may be required to access all resource tools.] Most insects can reproduce quickly within a short period of time, which means they evolve faster and can adjust to environmental changes. Most reproduce by sexual...
Khan Academy
Khan Academy: The Biology of Zika Virus
Learn about the basic biology, origins, life cycle, and symptoms of Zika virus.
BiologyWise
Biology Wise: Life Cycle of an Amoeba
The amoeba is a unicellular protozoan organism that has existed since prehistoric times. Its physical characteristics, life cycle, and metabolic activities are described in this resource.
Massachusetts Institute of Technology
Mit: Open Course Ware: Courses: Biology: Cell Biology
College-level course highlighting the biology of cells of higher organisms. Course topics include cellular membranes and organelles; cell growth and oncogenic transformation; transport, receptors, and cell signaling; the cytoskeleton,...
CK-12 Foundation
Ck 12: Biology: Reproductive Life Cycles
[Free Registration/Login may be required to access all resource tools.] An overview of three types of sexual life cycles.
BiologyWise
Biology Wise: Carbon Cycle Diagram
Explains what the carbon cycle is and the basic steps in the cycle.
Sumanas
Sumanas Inc: Life: The Science of Biology: The Ovarian and Uterine Cycles
An opportunity for understanding the biology of the female reproductive system through animated presentations and test understanding with a quiz.
McGraw Hill
Glencoe Biology: Cell Cycle Regulation: Self Check Quiz
Try these five multiple-choice questions about cell cycle regulation. After submitting answers, students can review the material.
TeachEngineering
Teach Engineering: Carbon Cycles
Students are introduced to the concept of energy cycles by learning about the carbon cycle. They will learn how carbon atoms travel through the geological (ancient) carbon cycle and the biological/physical carbon cycle. Students will...
Morning Earth
How Life Works: Biosphere Is Process: Rock Cycle: The Marriage of Water and Rock
Students examine the biology topic of ecology. The tutorial includes definitions, questions, and pictures on rock cycles.
Sumanas
Sumanas Inc: Life: The Science of Biology: Life Cycle of a Moss
Studying mosses? Here is a great animation on the reproductive cycle of a moss.
US Geological Survey
Mercury in the Geochemical Cycle
Mercury in the geochemical cycle ultimately affects the food chain. Learn about this and its effect on the Everglades.
Soft Schools
Soft Schools: Biology Quizzes: The Carbon Cycle
Assess your understanding of the carbon cycle with this interactive multiple choice quiz. Immediate feedback is provided.
Open Curriculum
Open Curriculum: Water and Water Cycle
An illustrated article helps learners understand the water cycle and the distribution of Earth's water.
Other
Keratin.com: Hair Biology Index
This site, dedicated to hair information ranging from baldness to excess hair growth, explores the biology of hair. Contents includes a focus on the structure and function of skin and hair, hair follicle structure, ethnic differences in...
Estrella Mountain Community College
Online Biology Book: Cell Division: Binary Fission and Mitosis
Short animations, detailed information, and illustrated diagrams help explain the cell cycle and cellular division, focusing on binary fission and mitosis.
BiologyWise
Biology Wise: Interesting Facts About June Bugs
Describes the physical characteristics of June bugs and their life cycle, and provides many other facts about these beetles.
BiologyWise
Biology Wise: Cellular Respiration Diagram
The equation for cellular respiration is given and a diagram is provided that illustrates the process with glycolysis, the Krebs cycle, and the electron transport chain shown. Each of these steps is explained and a summary of the total...
Biology Pages
Kimball's Biology Pages: Antibacterial Agents
This site lists the different antibiotics, tells how they disrupt the life cycle of the bacteria, and give examples of where in nature the antibiotic is from- i.e., penicillin -> bread mold.
CK-12 Foundation
Ck 12: Cell Cycle, Mitosis and Cytokinesis
[Free Registration/Login may be required to access all resource tools.] A description of the stages of eukaryotic cell division, a summarization of mitosis and the metaphase plate, an explanation of the function of the centrioles and the...