27.
The Origin and Diversification of the Eukaryotes 582
27.1
How Do Microbial Eukaryotes Affect
the World Around Them? 583
The phylogeny and morphology of the
microbial eukaryotes both illustrate
their diversity 583
Phytoplankton are the primary producers
of the marine food web 584
Some microbial eukaryotes are endo¬sym¬bionts
585
Some microbial eukaryotes are deadly
585
We continue to rely on the products
of ancient marine microbial eukaryotes
586
27.2
How Did the Eukaryotic Cell Arise?
588
The modern eukaryotic cell arose in
several steps 588
Chloroplasts are a study in endosymbiosis
589
We cannot yet account for the presence
of some prokaryotic genes in eukaryotes
590
27.3
How Did the Microbial Eukaryotes Diversify?
591
Microbial eukaryotes have different
lifestyles 591
Microbial eukaryotes have diverse
means of locomotion 591
Microbial eukaryotes employ vacuoles
in several ways 591
The cell surfaces of microbial eukaryotes
are diverse 592 27.4
How Do Microbial Eukaryotes Reproduce?
593
Some microbial eukaryotes have reproduction
without sex, and sex without reproduction
593
Many microbial eukaryote life cycles
feature alternation of generations
593
Chlorophytes provide examples of several
life cycles 594
The life cycles of some microbial
eukaryotes require more than one host
species 595
27.5
What Are the Major Groups of Eukaryotes?
596
Alveolates have sacs under their plasma
membrane 596
Stramenopiles have two unequal flagella,
one with hairs 598
Red algae have a distinctive accessory
photosynthetic pigment 601
Chlorophytes, charophytes, and land
plants contain chlorophylls a and
b 602
Diplomonads and parabasalids are excavates
that lack mitochondria 603
Heteroloboseans alternate between
amoeboid forms and forms with flagella
603
Euglenids and kinetoplastids have
distinctive mitochondria and flagella
603
Foraminiferans have created vast limestone
deposits 604
Radiolarians have thin, stiff pseudo¬-
pods 605
Amoebozoans use lobe-shaped pseudopods
for locomotion 605
