PROTISTSPROTISTS

Last Section of MicroorganismsLast Section of Microorganisms

Lesson Outline:Lesson Outline:

3 Types of Protists3 Types of Protists Classification:Classification:

LocomotionLocomotion FeedingFeeding ReproductionReproduction

3 Types of Protists3 Types of Protists

AmoebaAmoeba EuglenaEuglena ParameciumParamecium

LocomotionLocomotion

1.1. AMOEBAAMOEBA- It rolls slowly on a It rolls slowly on a surfacesurface (i.e. ground, (i.e. ground,

leaf, etc). Must live in leaf, etc). Must live in waterwater. It looks like . It looks like the tracks on a bulldozer.the tracks on a bulldozer.

- It changes its shape by extending It changes its shape by extending pseudopodspseudopods (“false feet”). Pseudopods (“false feet”). Pseudopods are created by are created by cytoplasmcytoplasm pushing on the pushing on the cell membrane. This is called cell membrane. This is called amoeboid amoeboid actionaction..

LocomotionLocomotion

2.2. EUGLENAEUGLENA > > FlagellatesFlagellates

- Must live in Must live in waterwater- Uses its Uses its flagellumflagellum to to

move. Whips it in move. Whips it in front/behindfront/behind its body to its body to propel itself through the propel itself through the water.water.

- If there is If there is too little watertoo little water for this type of for this type of locomotion, the euglena locomotion, the euglena can use can use amoeboid amoeboid actionaction to move. to move.

LocomotionLocomotion

3.3. PARAMECIUMPARAMECIUM > > CiliatesCiliates

- Must live in Must live in waterwater- Uses its cilia to Uses its cilia to

move.move.- CiliaCilia move in move in waveswaves

and act as oars to and act as oars to propelpropel the the paramecium through paramecium through the the waterwater

FEEDINGFEEDING

AMOEBAAMOEBA The amoeba extends its The amoeba extends its pseudopodspseudopods around around

its preyits prey Where the pseudopods meet, a Where the pseudopods meet, a food vacuolefood vacuole

is formedis formed A A lysosomelysosome joins/fuses with the food vacuole joins/fuses with the food vacuole

Feeding in Amoeba continuedFeeding in Amoeba continued

The enzymes within the The enzymes within the lysosomelysosome start to start to digestdigest the food the food

The The nutrientsnutrients released from the food released from the food diffusediffuse into the cytoplasm of the amoeba into the cytoplasm of the amoeba

These nutrients are used in These nutrients are used in cellular cellular respirationrespiration to produce to produce ATPATP (energy) (energy)

Waste is Waste is removedremoved when the vacuole fuses when the vacuole fuses with the with the cell membranecell membrane and and ejectsejects the the wastewaste

ReproductionReproduction

Protist reproduction is Protist reproduction is asexualasexual The The nucleusnucleus is replicated through the is replicated through the

process of process of mitosismitosis. All the DNA is copied . All the DNA is copied exactlyexactly. Both the . Both the macronucleusmacronucleus and the and the micronucleusmicronucleus are replicated. are replicated.

The cell is then split into The cell is then split into two daughter two daughter cellscells through the process of through the process of fissionfission..

The daughter cells are The daughter cells are smallersmaller than the than the original parent, but otherwise are original parent, but otherwise are identicalidentical..