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What makes something alive?

Learn about the four characteristics of life: cells, energy use, response to environment, and reproduction. Understand the importance of cells, metabolism, homeostasis, and DNA in biology. Discover how organisms are able to survive and pass on genetic information.

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What makes something alive?

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  1. What makes something alive?

  2. Characteristics of Life Cells, Energy Use, Response to Environment, Reproduction.

  3. Learner Outcome: • I can describe the four characteristics of life. • I can define the following words: • Cell • Metabolism • Homeostasis • DNA

  4. What is Biology? • Biology is the study of all living things, from cells to ecosystems. • Organism: any living thing.

  5. All Organisms are made of Cells • All living things are composed of cells. • In multicellular organisms, cells are specialized to play a specific role. • What types of cells are these?

  6. All Organisms Need and Use Energy • All living things use energy through metabolism: sum of all the chemical processes that occur in an organism. • Some organisms produce their own energy while others must consume it.

  7. All Organisms Respond to their Environment • All living things must maintain stable internal conditions. • This is called homeostasis.

  8. All Organisms Pass on DNA from Parent to Offspring • All living reproduce in order to pass on DNA. • DNA: stores genetic information in all organisms. • Development: process by which an adult organism arises.

  9. Reproduction • All species of an organism have the ability to reproduce. • Reproduction is not essential to survival, but ensures continuation of a species.

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