CK-12 Foundation
Ck 12: Life Science: Producers
[Free Registration/Login may be required to access all resource tools.] Energy is the ability to do work. In organisms, this can be physical work, like walking or jumping, or it can be the work used to carry out the chemical processes in...
CK-12 Foundation
Ck 12: Life Science: Cellular Respiration
[Free Registration/Login may be required to access all resource tools.] How does the food you eat provide energy? Through the process of cellular respiration, the energy in food is changed into energy that can be used by the body's...
CK-12 Foundation
Ck 12: Life Science: Fermentation
[Free Registration/Login may be required to access all resource tools.] Sometimes cells need to obtain energy from sugar, but there is no oxygen present to complete cellular respiration. In this situation, cellular respiration can be...
CK-12 Foundation
Ck 12: Physical Science: Cellular Respiration Reactions
[Free Registration/Login may be required to access all resource tools.] Definition of cellular respiration and its overall chemical equation. The energy changes that occur during cellular respiration, including in photosynthesis.
CK-12 Foundation
Ck 12: Life Science: Process of Cellular Respiration
[Free Registration/Login may be required to access all resource tools.] Why do you need air to live? Of course if you didn't breathe, you couldn't survive. You need the gas oxygen to perform cellular respiration to get energy from your...
CK-12 Foundation
Ck 12: Life Science: Passive Transport
[Free Registration/Login may be required to access all resource tools.] The cell membrane is semi-permeable. Sometimes molecules need the help of special transport proteins or an input of energy to help them move across it. When an input...
CK-12 Foundation
Ck 12: Physical Science: Biochemical Reaction Chemistry
[Free Registration/Login may be required to access all resource tools.] Definition of a biochemical reaction, the different types and the importance of enzymes in biochemical reactions.
Morning Earth
How Life Works: Biosphere Is Process: Photosynthesis
Learners examine the biology topic of cell energy. The tutorial consists of definitions, pictures, and the basic sequence of photosynthesis.
PBS
Pbs Teachers: Scientific American: Forever Wild? Input and Output
Investigate the scientific principles of biospheres, and observe the effects of biological processes on closed systems.
Other
New Mexico Tech: The 7 Characteristics of Life
Describes the seven characteristics that define what life is for biological purposes.
Sophia Learning
Sophia: Enzymes Proteins That Pack a Punch!
Through a combination of slide show tutorials and a video demonstration, learn how enzymes work. [3:00]
CK-12 Foundation
Ck 12: Life Science: Protists Nutrition
[Free Registration/Login may be required to access all resource tools.] The cells of protists need to perform all of the functions that other cells do, such as grow and reproduce, maintain homeostasis, and obtain energy. They also need...