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7 Characteristics of Living Things

An introduction to the characteristics of life!
by

Ryan Sullivan

on 6 August 2011

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Transcript of 7 Characteristics of Living Things

characteristics of
Cell structure
Growth and development
Responsiveness
Heredity
Reproduction
Metabolism
all living things are made of cells
a human body is made up of about 50 trillion cells
90% of the cells that make up "you" are bacteria!
Cells work together to perform
all of the functions in your body
unicellular
multicellular
all living things grow (get larger) and develop (change)
zygote
embryo
how does the fertilized egg (zygote) "know" how to make an entire person?
Homeostasis
7
all living things must respond to their environment
finding food, shelter, mates...
avoiding predators...
even a single-celled organism like a bacterium
responds to its environment by
moving towards light or a food source
or deciding when to divide.
Metabolism is the sum of all of the chemical reactions that take place inside a living thing.
These include reactions that large molecules from small ones
Build Up
and reactions that large molecules into smaller pieces.
Break down
When you hear someone say, "she's skinny because she has a fast metabolism",
which type of reactions (buildup or breakdown) are they talking about?
When you eat a turkey sandwich, your body breaks apart the turkey and plant proteins
and builds them back up into the human proteins that make up you
(while also extracting some energy).
That's metabolism!
All living things must maintain homeostasis -
that means,
maintainig stable internal conditions
even when the environment changes.
For example these members of the "polar bear club"
will maintain a stable core body temperature by
shifting their blood flow away from their skin,
and shivering and increasing their metabolic rate to
increase their internal heat production.
and even though oranges are acidic,
your body maintains a constant pH
even if you eat only acidic foods.
living things
All living things reproduce...
from bacteria which divide in the simplest way
(called binary fission)
to more advanced sexual reproduction like
these adorable (?) mice pups.
a couple questions to consider:
Must an individual organism reproduce to be considered alive?
What would happen to a species that stopped reproducing?
When organisms reproduce, they pass down
genetic (hereditary information).
In this class we will learn about how DNA
stores information, and how offspring result
from a combination of two parents' DNA.
(do you see what's going on with the shirts?)

LOL?
A good way to make sense of biology is by asking, "how are all living things alike?"
This "Prezi" presentation takes you through the 7 characteristics that all living things share. Make sure you understand in general terms what each characteristic of life means.
In conclusion, the
are
(all of the chemical reactions)
(maintaining a stable internal environment)
The
and
Full transcript