Transcript Living Things

Studying Life
Characteristics of Living Things
 Many
characteristics constitute
living
 Are
cars living because the
move?
 Is a fire alive because it is
giving off energy?
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8 Characteristics
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Made up of cells
Reproduce
Universal genetic code
Grow and develop
Obtain and use materials and energy
Respond to environment
Maintain a stable internal environment
Change over time (as a group) - evolution
True/False
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Living Things have at least one cell.
Made Up of Cells
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Smallest living unit
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Can grow, respond, and reproduce
Highly complex
Unicellular – one cell
 Multicellular- many-celled
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Different types of cells
Reproduction
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Asexual – single parent
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Cell divides into two
Portion splits off to form new
organism
Sexual – two different
parents
Unite to produce first cell
of new organism
True/False
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Living Things contain genetic information.
Universal Genetic Code
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Based on DNA
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Determines the traits of every
organism
True/False
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Living Things grow.
Living Things grow and develop.
Growth and Development
All organisms grow during at least
part of their lives
 Eggs –> maggots –> flies =
development
 Cells become different from one
another
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Skin, WBC, RBC
True/False
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Living Things eat.
Living Things require an energy source.
Obtain and Use Materials and Energy
 Need materials to stay alive
 Metabolism
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Combination of chemical reactions
through which a organism builds up or
breaks down materials as it carries on
with life
Energy sources
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Light, chemicals, animals, plants
True/False
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Living things move.
Living things respond to the environment.
Response to the Environment
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Organisms make changes to adjust to
environment
 Too cold? What does your body do?
 What does a cold-blooded animal do?
 Light comes from one direction –
What does a plant do?
• Living Things breath
• Living Things exchange gases and produce
waste.
Maintaining Internal Balance
Homeostasis
 Process by which organisms keep
stable internal conditions
 What do you do when you are
thirsty?
 What happens when you have a
fever?
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True/False
• Living Things change over time (a very long
time).
Evolution
 Basic
traits inherited from
parents usually do not change
• As a group, over time, any kind
of organism can change
 Takes Hundreds or thousands of
years
Are Viruses Alive?
Viruses:
 Has genetic material
 Can evolve in response to immune system.
 Need a host cell to reproduce.
 Acquire energy from their host cell.
Homework due 8/30
Explain the main differences between living cells
and viruses. Are Viruses alive? Give three
supporting details. (see chapter 1 and p. 544)