Transcript It`s Alive! ...Or Not!

It’s Alive!...Or not!
Characteristics of Living Things
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Living Things Have Cells
Living Things Sense and Respond to
Change
Living Things Reproduce
Living Things Have DNA
Living Things Use Energy
Living Things Grow and Develop
Living things have CELLS
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Every living thing is composed of one or
more cells.
Organism- name given to any living
thing.
Living Things Use Energy
• All energy used by living things comes
directly or indirectly from the sun.
Living Things Sense and
Respond to Change
• Stimulus- anything that causes a change
in an organism
• Response- reaction to a stimulus.
• Homeostasis- an organisms ability to
keep the proper conditions inside no
matter what is going on outside the
organism.
OUCH!!!!
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Person
(Organism)
=
Touch Stove when hot
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(stimulus)
OUCH!!!!
=
(response)
Living Things Reproduce
• Asexual reproduction- reproduction in
which a new organism is produced from
one organism and has DNA identical to the
parent.
• Sexual reproduction- reproduction in
which two cells join in order to form a new
cell which will have DNA similar to the
parents.
Vs.
Paramecium Dividing
Sperm fertilizing an Egg
(Asexual Reproduction)
(Sexual Reproduction)
Living Things Have DNA
• DNA- Is like the user manual for a cell.
Living Things Grow and Develop
• Organisms change as they grow.
The “Bear” Necessities of Life
food
water
shelter
space
air
The Chemistry of Life
…and you thought that this was
just life science???
Proteins
• Proteins are made of long chains of amino
acids all twisted up like a knot.
• It makes: hemoglobin - which carries
oxygen around the body in your blood.
antibodies - to fight diseases cuts and
grazes heal up.
Carbohydrates
• Carbohydrates come in two basic forms:
complex and simple.
• Simple carbs are one, two, or at most three units
of sugar linked together in single molecules.
• Complex carbs are hundreds or thousands of
sugar units linked together in single molecules.
• Simple sugars are easily identified by their taste:
sweet.
• Complex carbs, such as potatoes, are pleasant
to the taste buds, but not sweet.
Lipids
• When you think of fats, you should know
that they are lipids.
• Lipids are also used to make steroids and
waxes.
• So your ear wax is a lipid, too!
DNA
• Is like the user
manual for a cell.
• It holds all the codes
for cells.
• DNA = Instruction