ProtistsDo Now:1. Please complete the following chart2. When finished, find the mass of dry soil from the plant lab.
Plant-like protists
Animal-like protists
Fungi-like protists
Group name algae protozoa myxomycota
Examples Many groups Amoeboids, cilliates, and others
Slime molds
niche producers predators decomposers
Bioenergetics ConnectionUnit 2 is about bioenergetics and
covers the following:◦Photosynthesis◦Respiration◦Protists (Earliest eukaryotes with
chloroplasts & mitochondria)◦Human energy use & issues
Quick Review of Key PointsPhotosynthesis
◦Formula:◦Chloroplasts
Respiration◦Reverse of photosynthesis◦Mitochondria
Part 3, ProtistsOxygenation of the atmosphere
by photosynthesis 2.5 – 2.0 BYA allows aerobic respiration
Organisms diversify and become more complex
Eukaryotes evolve through endosymbiosis of chloroplasts and mitochondria
Protist GroupsThese groups are convenient
classifications, not phylogenetic ones.Plant-like protists
Animal-like protists
Fungi-like protists
Group name
algae protozoa myxomycota
Examples Many groups
Amoeboids, cilliates, and others
Slime molds
niche producers predators decomposers
AlgaeContain chloroplasts & other
plastids; do photosynthesis.Also contain mitochondria; do
aerobic respirationMost are unicellular, some are colonial or even multicellular.
Contains tens of thousands of species, in several groups.
Protozoa“proto” = first, “zoa” = animalThink of the protists as
unicellular animals.They are heterotrophs, and
almost all are predators on prokaryotes or smaller eukaryotes.
For convenience, they are classified by locomotion.
FlagellatesCharacterized by 1
or more flagella
Example: TrypanosomaCauses African sleeping sickness
CilliatesMove by beating tiny
ciliaExample:
paramecium
AmoeboidsMove with pseudopodia in a blob-like
mannerPseudo = false; podia = feetExample: Amoeba proteus
Sporozoa – “Spore Animals”
No motility (except for some gametes)
Obligate pathogens
Example: Plasmodium (causes malaria)
Four Groups of ProtozoaFlagellates
Ciliates Amoeboids
Sporozoa
Locomotion
Flagella Cilia Pseudopodia
N/A
Important examples
Trypanosoma / sleeping sickness
Paramecium N/A Plasmodium / malaria
