Protists

Chapter 21

P 459-474

Characteristics of ProtistsVariety in types of movementVariety in types of nutritionVariety of environments needed for lifeVariety of reproduction methodsDo not have specialized features

Diversity of ProtistsAmoebas and forams are protists that

move using cytoplasmic extensions called pseudopodia

Diatoms are unicellular protists with glasslike double shells

Flagellates move with the use of flagella

AlgaeAre strictly photosynthetic protists that

can be multicellular or unicellular.Are classified according to the type of

phototsynthetic pigment they contain

Protist DiversityCiliates are unicellular protists that use

cilia to moveCellular slime molds normally live as

individual cells They can aggregate during times of

stress

Protist DiversityPlasmodial slime molds live as colonial

organisms and form sexual reproductive structures that form and spread spores.

Oomycetes are molds that live as saprophytes or parasites

All sporozoans are parasitic and have complex life cycles.

Protista PhylaSee Table 1 (page 461)

Ameboid MovementOrganisms include Amoebas and

ForaminiferaUse pseudopodia to moveHave unicellular bodies and are

heterotrophs

AlgaeStrict phototrophsTypes:A. Green AlgaeB. Red AlgaeC. Brown Algae

DiatomsPhotosynthetic unicellular protistsMove by glidingDiatoms get smaller as they reproduceNeed to get a new shell

FlagellatesTypes:A. DinoflagellatesB. EuglenoidsC. Kinetoplastids

CiliatesMost complex and unusual protistsHave large numbers of cilia which

enables movementTwo types of nuclei a micronuclei and a

macronuclei

Protista MoldsTypes:A. Cellular Slime MoldsB. Plasmodial slime moldsC. Water moldsD. White RustsE. Downy Mildews

Sporozoans4, 500 species in the Apicomplexa

phylumHas both a sexual and an asexual

reproductive life cycleTable 2 page 471

Protist DiseasesTable 3 page 472

Life cycle of Plasmodium page 473