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The Characteristics of Life
Cells and Organization
• Organisms are highly organized, both inter-cellular
and intra-cellular, Unicellular AND Multicellular
• Both Molecular and Cellular Organization
• Result of DNA
• Cells are the basic unit of
organization, organs follow
• Cells – tissues – organs – organ systems – organism
• Life is made of same molecules
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Why do the characteristics of life
matter?
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Biology is the study of living things
Provides organization to learn about Biology
A living thing is called an organism
ALL organisms have ALL the COL’s
You have these things in common with…
Diversity (
)
vs.
Unity (
)
The Characteristics of Life
all life…
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Cells and Organization
Metabolism
Reproduction
Stimulus and response
Growth and development
Homeostasis
Evolution
DNA and Heredity
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Elemental Organization
Most Common Elements
• 4 basic molecules are mostly made of same
elements.
• C – Carbon
• H – Hydrogen
• N – Nitrogen
• O – Oxygen
• P – Phosphorus
• S - Sulfur
Metabolism
• Organisms receive or obtain energy
from its surroundings
• Use this energy to maintain, grow, and
reproduce (photosynthesis and
respiration)
Stimulus & Response
• Living things respond to their environment
– Stimulus
• Change in their environment
– Response
• What it does OR how it reacts (photoperiods, hibernation, migration)
• Organisms sense changes in their surroundings
– Sensory Systems and Receptors
• How they sense the change in their environment
• The nervous system
• Our 5 senses
Reproduction
• ALL organisms came from other organisms
• Cells come from other cells
• Inheritance of the organization for that
species (from DNA)
• Can be sexual or asexual
• Does every organism need to reproduce?
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Survival of the species not dependent on each
organism
Growth and Development
• Growth
– Size change
– Increase in number and or size of cells
• Development
– Structural changes
– Specialization of cells
– Stem Cells
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Homeostasis
• Latin = “Same State”
• “Ability to maintain a suitable internal
physical and chemical environment for life
processes”
• All the reactions bodies perform to make
and use energy
– Eating, digestion, execretion
Analyzing Data Pg. 20
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