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 Protozoa

Flagellates

Ciliates Amoeboids

Sporozoa

Locomotion

Flagella Cilia Pseudopodia

N/A

Important examples

Trypanosoma / sleeping sickness

Paramecium N/A Plasmodium / malaria