DNA Upclose and Personal a. A Molecular Approach e. DNA Forensics 10. Taxonomy a. Levels of Classification b. Dichotomous Keys c. This energy must be in a usable form.
Most factories have power plants in which generators burn fuel to produce heat.
This heat energy is used to make steam, which is then used to make electricity. But for this to occur, a cell must have an energy source, and that energy must be in a form that the cell can use. Like our factory's power plant, mitochondria and chloroplasts transform one form of energy to another. Remember that nearly all the energy used by living things on Earth comes from the Sun. This section discusses how energy is made available for cell processes.