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What is Biology? Study the Characteristics of Life and Cell Theory

Learn about the study of life and the characteristics that define living organisms, including the cell theory. Find out if viruses are considered living organisms.

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What is Biology? Study the Characteristics of Life and Cell Theory

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  1. LIFE

  2. Biology…What is it? Biology is the study of life. SO….What does it mean to be living?

  3. Characteristics of Life To be considered living, an organism must….. • Be based on a universal genetic code. • DNA 2.Grow and develop

  4. 3. Be able to Reproduce -Asexually -Sexually 4. Use materials and energy -Metabolism Characteristics of Life

  5. 5. Be able to respond to their environment-stimulus response Characteristics of Life • Humans: • Plants:

  6. 6. Maintain stable internal environment-Homeostasis Characteristics of Life

  7. Made of units called Cells-Unicellular-Multicellular Characteristics of Life 7. Change over time, as a group.-Evolution

  8. Cell Theory Matthias Schleiden concluded that all plants are made of cells (1838) Theodore Schwann concluded that all animals are made of cells (1839) Rudolf Virchow concluded that all cells came from pre-existing cells (1855) Cell Theory • all living things are made up of cells • cells are the basic units of structure and function in an organism • new cells are produced from existing cells

  9. Nervous System Brain Nervous Tissue Nerve Cell Levels of Organization Human Protein Carbon

  10. Viruses…Living or not? Viruses come in many different shapes and they cause many different diseases but, they all have something in common…. • Now that we know what makes something living, let’s look at a virus.

  11. Viruses and Living Cells

  12. Verdict? • No, Viruses are not considered a living thing because they do not meet all of the living characteristics.

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