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Characteristics of Life

Characteristics of Life. 1. All Life is Made of Cells. Cells are very small, very organized and covered by a membrane. Cells are the smallest unit of life. 2. All living things reproduce. 3. Metabolism. What do scientists mean by metabolism?.

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Characteristics of Life

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  1. Characteristics of Life

  2. 1. All Life is Made of Cells

  3. Cells are very small, very organized and covered by a membrane Cells are the smallest unit of life.

  4. 2. All living things reproduce

  5. 3. Metabolism

  6. What do scientists mean by metabolism? • Metabolism is the sum of all chemical reactions carried out in an organism • Living organisms carry out reactions to obtain and use energy.

  7. 4. Homeostasis

  8. What is homeostasis? • Homeostasis is the ability to maintain stable internal conditions. What are some examples of this ability in humans?

  9. Examples of Homeostasis • In humans: • Shivering, sweating, feeling thirst or hunger • Other animals that live in the cold have fur or a layer of fat to keep warm • Bacteria that live in toxic environments like high acid lakes can neutralize the acid in their cells

  10. Heredity

  11. All living things pass on traits to their offspring • The passing of traits from parents to offspring is called heredity • A gene is a short section of DNA • A gene is the basic unit of heredity • A mutation is a change in the DNA of a gene

  12. All living species evolve

  13. Evolution occurs in populations not individuals • Evolution is a change in the inherited characters of a species over time. • Natural Selection – the process in which organisms with the most favorable traits are more likely to survive and reproduce

  14. Interdependence

  15. All life depends on other living things • All living things are connected • Ecology is the branch of biology that studies the interactions of organisms with each other and with the nonliving part of their environment.

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