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-parasites of animals, and some cause serious
human diseases
-They spread through their host as infectious cells
called sporozoites
-One end, the apex, contains a complex of
organelles specialized for penetrating host cells
and tissues
Gene Flow
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, Movement of alleles among populations
Exoenzymes
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transported outside the cell, where they break down large food molecules
or harmful chemicals
Septate Hyphae
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hyphae whose cells are divided by septa (septum)
Biological Species Concept
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defining a species as a population whose members have the potential to
interbreed in nature and produce viable, fertile offspring
Kinetoplastids
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, -have a single mitochondrion with an organized
mass of DNA called a kinetoplast
-free-living species are consumers of prokaryotes
in freshwater, marine, and moist terrestrial
ecosystems
-in the genus Trypanosoma cause sleeping
sickness in humans
-another pathogenic trypanosome causes Chagas'
disease
-use "bait-and-switch" defense
Diplomonads
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-have reduced mitochondria called mitosomes
-derive energy from anaerobic biochemical
pathways
-have two equal-sized nuclei and multiple flagella
-are often parasites, for example, Giardia
intestinalis
Haustoria
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specialized parasitic hyphae that invade living cells and secrete digestive
enzymes
Chitin