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BACTERIA & PROTISTS HAVE CHARACTERISTICS OF LIVING THINGS, WHILE VIRUSES ARE NOT ALIVE

BACTERIA & PROTISTS HAVE CHARACTERISTICS OF LIVING THINGS, WHILE VIRUSES ARE NOT ALIVE. SINGLE –CELLED ORGANISMS AND VIRUSES. SINGLE-CELLED ORGANISMS & VIRUSES. SINGLE-CELLED ORGANISMS HAVE ALL THE CHARACTERISTICS OF LIVING THINGS BACTERIA ARE SINGLE-CELLED ORGANISMS WITHOUT NUCLEI

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BACTERIA & PROTISTS HAVE CHARACTERISTICS OF LIVING THINGS, WHILE VIRUSES ARE NOT ALIVE

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  1. BACTERIA & PROTISTS HAVE CHARACTERISTICS OF LIVING THINGS, WHILE VIRUSES ARE NOT ALIVE SINGLE –CELLED ORGANISMS AND VIRUSES

  2. SINGLE-CELLED ORGANISMS & VIRUSES • SINGLE-CELLED ORGANISMS HAVE ALL THE CHARACTERISTICS OF LIVING THINGS • BACTERIA ARE SINGLE-CELLED ORGANISMS WITHOUT NUCLEI • VIRUSES ARE NOT ALIVE BUT AFFECT LIVING THINGS • PROTISTS ARE A DIVERSE GROUP OF ORGANISMS

  3. SINGLE-CELLED ORGANISM • Living things come in many shapes & sizes • Living things share common characteristics • Living things need energy, materials, & living space • Viruses are not alive

  4. Living things come in many shapes & sizes • One of the largest living organisms is the honey mushroom fungus living mostly underground (about 3 miles or over 1600 football fields) • Any living thing is called an organism • Microorganisms are very small organisms, and made of just one cell. (need microscope to see) • Scientists divide the organisms they identify into groups called KINGDOMS.

  5. Common Characteristics • ORGANIZATION: cells are the basic unit of all living things. Cells are able to get energy from and sense their environment and move. • GROWTH: living things increase in size. All living things need energy & materials to build or repair its structures. • REPRODUCTION: reproduce to form other organisms like themselves. Binary fission = material from 1 cell, splits in 2. Some single celled organisms use this to reproduce. • RESPONSE: respond to changes in environment (light, temperature, touch, etc. lets them find food or do other tasks needed for survival).

  6. NEEDS • Living things need ENERGY, MATERIALS & LIVING SPACE • FOOD: supplies you with energy (to move, grow & develop). Animals break down food to usable forms, plants transform sunlight to usable energy. • WATER: most activities of living things take place in water (all of cell’s reactions) • AIR: CO2 & O2 (oxygen) are some things in air that most organisms use to capture & release energy through. Some organism (in hydrothermal vents) use other chemicals to capture & release energy.

  7. VIRUSES ARE NOT ALIVE • VIRUS has genetic material enclosed in a protein shell. • Viruses have many of the characteristics of living things but not as complex as a cell and not considered a living thing. • Animal cells have structures that let them get materials or energy from environment, while viruses do not. They do not grow once formed. • Viruses can’t reproduce on own, but must “take over” a cell to use it to make more viruses.

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