WARM UP 9/15/09 True or False?

1
WARM UP 9/15/09 True or False? answer in
notebook

1. If it moves it is alive
2. If it seems to move by itself, its alive if
   its moved by something else, its not alive.
3. If it makes light or noise it is alive
4. Its not alive unless it is doing something

• To be alive, it must breathe
• Not all living things grow
• Bacteria and fungi are not living things
• Plants have a completely different kind of life
  than animals

2
Characteristics of Living Things

• What is Life?
• Define life?
• Is this a living thing? an organism?
• Origin?...
• Spontaneous generation/abiogensis
• or biogenesis?

3
No one definitive list

• Organized
• Reproduce
• Responds to stimuli
• Requires water and energy
• Adaptation
• Grow and Develop
• Maintain homeostasis

4
Organization

• One or more cells unicellular, multicellular
• Cells contain DNA molecules heredity
• Common set of compounds organic molecules
  carbon hydrogen
• Simple to complex at all levels
• Maintain and repair structure

organs
organ systems
tissues
organisms
cells
populations
compounds
communities
molecules
ecosystems
atoms
biosphere
5
Reproduction

• Marks a successful life
• Continues the species
• Group of organisms that can interbreed and
  produce fertile offspring
• Pass on genes / DNA
• Sexual and/or asexual

6
Respond to stimuli

• Possess irritability able to respond
• Stimulus must be strong enough to elicit a
  response
• Must respond to environmental stimuli to survive
  and/or reproduce
• Homeostasis maintain internal conditions or
  environment
• By internal feedback systems communicate

7
ENERGY REQUIRED

• Ultimate source is the sun
• To maintain other characteristics and stay alive
  
• Must be obtained ingested or absorbed
  converted to a usable form
• May be transformed and transferred but never
  created or destroyed
• Respiration exchange gases with environment
• Require water for chemical reactions
• METABOLISM sum of all chemical reactions and
  energy exchange within an organism
• Anabolic reactions build up simple gtgt complex
• Catabolic reactions break down complex gtgt
  simple

8
Change over time

• Growth increase in size
• Develop change in abilities / -
• Die limited lifespans

9
Adaptation

• Inherited structure, behavior or internal process
  that enables organism to respond to environmental
  factors and live successfully
• Only an adaptation if inheritable
• Must match environment
• Gradual accumulation of adaptations result in
  evolution
• Result of mutation not intentional
• Must be able to be passed along
• Able to move in some manner to meet needs

10
All living things

• Have every characteristic at some time in their
  life
• Similar in the variety of processes they carry
  out
• May be in a state of dormancy
• Individual does not have to reproduce to survive
  but species must!