Cell Theory

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What is
LIFE??
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Living Non-Living? (biotic)
(abiotic)
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Organize the following into your table..

• Toenail
• Sun
• Hair
• Nerve Cell
• Leaf

• Fire
• Tree bark
• Water
• Algae
• Bacteria

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What makes something alive?

• Ideas?

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Characteristics of Living Organisms

1. Cells
2. Organization
3. Energy Use
4. Growth/Development
5. Reproduction
6. Homeostasis

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Cells

• All living things have at least one cell the
  cell is the basic unit of all life.
• If an organism has more then one, then cells are
  often grouped together for a specific function
  (i.e. nervous system, digestive system)

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Organization

• All life functions are carried out in an orderly
  fashion
• One cell has many structures inside it which have
  specific functions
• Cells may group together to perform certain
  functions (e.g. nervous system)
• All have a definite form, limited size, limited
  life span

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Energy Use

• All organisms use energy.
• This is called metabolism. This energy is used to
  carry out everything they do.
• Autotrophs (plants) use energy from the sun for
  photosynthesis, to make their own food
  (glucose).
• Heterotrophs must ingest food to gain energy

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Growth/Development

• Growth is an increase in the amount of living
  material in the organism. It is accomplished by
  increasing the number or size of the cells
• example a small goldfish gets larger

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Development is the changes that occur as the
organism matures to adult form example is the
metamorphosis of a ladybug ?egg ? larva ? pupa?
adult
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Reproduction

• all reproduce either one parent (asexual) or two
  parents (sexual), characteristics are passed from
  one generation to another by genetic code (DNA)
• asexual clone

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sexual combination of both parents
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Homeostasis

• All organisms have the ability to maintain stable
  internal conditions regardless of external
  conditions (in order to remain alive.)
• Examples
• if too hot, your body sweats to cool down
• if too cold, your body shivers to produce heat
• your body tries to stay the same temperature
  (37C ) regardless of the temperature outside it

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