unit 1: characteristics of life powerpoint
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Notes for Characteristics of LifeTRANSCRIPT
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Characteristics of Life
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All living organisms share
_______ characteristics of
life. Many things in the
world show one or more
of these characteristics,
but only living things
share all eight!
8
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1. ________• Organisms are made of cells.
They might be _________________ (one cell) or ____________________ and very complex. The cell is the _________ _________ of life.
Cells
unicellularmulticellular
basic unit
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2. _____________
• All organisms need to produce new
organisms. They may reproduce
________________ or ______________.
Reproduction
sexually asexually
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3. ___________
• All of life is based on the same
_______________ code—a
molecule called DNA. All inherited
______________are passed down
through generations in the DNA.
DNA
genetic
traits
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4. __________ and Development
• Organisms all grow and develop in
some way. Even single-celled
organisms get bigger before they
__________ into two.
Growth
divide
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5. Use of ____________
• All living things must store
and use energy, and expel
waste. This process is called
__________________________. It
might involve eating,
photosynthesizing like plants do, or
engulfing nutrients as a single cell.
energy
metabolism
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6. ___________ to Stimuli• A __________________ can be light, a temperature
or pH change, a touch, an electric charge, or
anything in the environment that causes a response
from a living organism.
Responsestimulus
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7. ___________________ Homeostasis is the ability of an organism to
maintain its internal _____________ of factors
like temperature, pH, and salt content.
Homeostasis
balance
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• Just like a thermostat constantly monitors the
temperature of the house and turns on and off
when necessary, the body has many
mechanisms in place to keep internal
conditions within a narrow _______________.range
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8. Adaptation and _____________• Over long periods of __________________ time,
all living things change in order to better fit their
environment. It is important to remember that
populations as a whole evolve; _______________
do not.
Evolutiongeologic
individuals
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Disproving Spontaneous Generation: Where does life come from?• Before the 1600s, many people believe that life
could pop out of thin air—this theory is called _________________________________. spontaneous generation
Several scientists conducted
experiments from the mid-1600s
to the mid-1800s to disprove
spontaneous generation and show
that life can only come from other
living organisms.
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RediFrancisco _________ conducted an experiment in 1658 in
which he put meat into jars. In a jar that was open to the air, ______________ would form after a time. In a jar that was covered with gauze, no maggots would form. This showed that the maggots were not forming from thin air.
Redimaggots
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Pasteur
• Louis ______________ was famous for many scientific discoveries. One of them involved the disproval of spontaneous generation.
Pasteur
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• He sterilized broth in a __________________ flask. Because of the shape of the neck, the _____________________ that could grow in the broth would settle in the bend and not reach the flask. So, even though it was open to the air, no life would grow in the flask. When the neck was broken, microorganisms would start growing again.
swan-necked
microorganisms