Amoeba Power Pt.
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Transcript of Amoeba Power Pt.
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The Shape ShifterThe Amoeba
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Facts:
• The amoeba is a tiny, one-celled
organism. You need a microscope to see
most amoebas - the largest are only about
1 mm across.
• Amoebas live in fresh ater, salt ater, in
et soil, and in animals !including people".
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Anatomy
• An amoeba consists of a single cell surrounded
by a porous cell membrane. The amoeba
#breathes# using this membrane - o$ygen gas
from the ater passes in to the amoeba throughthe cell membrane and carbon dio$ide gas
leaves through it.
• %elly-li&e cytoplasm fills most of the cell. A large
nucleus ithin the amoeba controls its groth
and reproduction.
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Diet
• Amoebas eat algae, bacteria, plant cells,
and microscopic proto'oa. (ome
amoebas are parasites.
• They eat by surrounding tiny particles of
food ith pseudopods, forming a bubble-
li&e food vacuole. The food vacuole
digests the food.
http://www.enchantedlearning.com/subjects/bacterium/http://www.enchantedlearning.com/subjects/bacterium/
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Locomotion
• Amoebas move by changing the
shape of their body, and oo'ing in
random directions. The oo'eforms a pseudopod. The ord
pseudopod means #false foot.#
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• Pelomyxa proteus is the largest
amoeba you can find in pondater. )t inhabits the often o$ygen
poor mud on the bottom of ponds.They can become truly huge for a
single celled organism. (ome of
them can be * millimeters.
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) e$amined
the sample
under the
microscope itloo&ed li&e
nothing more
than dirt but
beteen itere some
big
gelatinous
spheres.
Then )noticed that
they ere
sloly
moving+
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Amoeba roteus, the largest amoeba of them all.
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Feeding Strategies
• These to images of Amoeba proteus shos ho a ciliate is surrounded by uic&developing pseudopods. The ama'ing
thing is that the amoeba doesnt touch theciliate until it can/t escape. 0sually thepseudopods form a &ind of /dome/ thatma&es escaping impossible. They have tohave some sort of chemical detectionsince they notice a prey ithout having totouch it.
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These pictures sho
an amoeba eating.
2otice the pseudopods
that are used to
enclose a small ciliate.
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1.Nucleus
2.Contractile
vacuole
3.Food
vacuole
4. Pseudopod
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An Amoeba
is seen here
splitting by
cell division.3hen
complete
division is
complete,there ill be
to ne
amoebas.
This is hat a typical amoeba could loo& li&e under your
microscope. They appear as dirt until you notice they 4567+
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Things to identify on your amoeba:
• 2ucleus
• Food vacuole
• 8ontractile vacuole• 9escribe pseudopod
• 8ytoplasm
• 8ell 4embrane• 9escribe cytoplasmic streaming