slide 1 of 13 are you smarter than a microbe? cle/dn17390-why-microbes-are- smarter-than-you-...
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ARE YOU SMARTER THAN A MICROBE?
http://www.newscientist.com/article/dn17390-why-microbes-are-smarter-than-you-thought.html?DCMP=OTC-rss&nsref=online-news
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Navigation
Water-borne Chlamydomonas algae - they swim towards light but only if it is at a wavelength they can use for photosynthesis.
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Memory
Amoebas employ sophisticated strategies to look for food and might travel in a way that
optimises their foraging.
A recent study suggests that the cells have a rudimentary memory, being able to remember the last direction they had just turned in,
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Human sperm have this ability too….
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20-1 The Kingdom Protista
20-1 The Kingdom Protista
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What Is a Protist?
What Is a Protist?
What are protists?
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20-1 The Kingdom Protista
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Protists are eukaryotes that are not members of the Plant, Animal, or Fungi kingdoms.
What Is a Protist?
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20-1 The Kingdom Protista
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The kingdom Protista may include more than 200,000 species.
Most, but not all, protists are unicellular.
Extremely diverse group of organisms
Many are motile
What Is a Protist?
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20-1 The Kingdom Protista
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Evolution of Protists
The first eukaryotic organisms on Earth were protists.
“Protista” is a greek word meaning first
Evolution of Protists
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20-1 The Kingdom Protista
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Classification of Protists
One way protists can be classified is by how they obtain nutrition:
• Heterotrophs are called animal-like protists.
• Photosynthesizers are called plantlike protists.
• Decomposers and parasites are called funguslike protists
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Classification of Protists
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20-1
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A protist is any organism that is not a plant, an animal, a fungus, or a prokaryote.
a. True
b. False
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Animal-like protists are
a. autotrophs.
b. heterotrophs.
c. decomposers.
d. producers.
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Biologists have difficulties classifying protists because
a. their DNA cannot be examined.
b. evidence suggests that they evolved from so many different groups.
c. structural similarities used for classification are difficult to detect.
d. their ancestors may have evolved through symbiosis.