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

Copyright Pearson Prentice Hall

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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


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What Is a Protist?

What Is a Protist?

What are protists?

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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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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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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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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

.

Classification of Protists

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20-1

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20-1

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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20-1

Animal-like protists are

a. autotrophs.

b. heterotrophs.

c. decomposers.

d. producers.

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20-1

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.

Slide 1 of 13 ARE YOU SMARTER THAN A MICROBE? cle/dn17390-why-microbes-are- smarter-than-you-...

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