Protozoans

ANS 389C

Traditionally, how many Phyla were in Kingdom Protozoa? How many are there now?

traditionally 4 phyla, now 13 phyla

List the phyla of Kingdom Protozoa

• - Euglenzoa

• - Metamonada

• - Apicomplexa

what does it mean when an organism is unicellular?

no matter how complex their bodies may be, all different structures are contained in a single cell

(true/false) protozoa are eukaryotes

true

what does it mean if Protozoa are eukaryotes?

• - they’re DNA is compartmentalized within a nucleus

• - different from bacteria (which are prokaryotic)

what internal structures do Protozoa have?

• - nucleus

• - endoplasmic reticulum

• - mitochondria

• - golgi body

• - lysosomes

what structures do Protozoans have that allow them to move?

• - flagellum (single or multiple)

  • — whip-like tail for propulsion attached to basal body

  • — also, may propel and undulating membrane

• - cilia

  • — fine short hairs, each arising from a basal body that beat in unison

• - pseudopodia

  • — prolongation of cytoplasm

endocytosis

the cell membrane gradually enveloping the droplet or object which has become adherent to its outer surface

penocytosis

cell drinking; liquids or dissolved substances

phagocytosis

cell eating; large particles like bacteria or debris

particles are carried into the cell and digested by ________

lysosomes

undigested material is _________ from the cell

extruded

what do some Protozoa have to take in food?

“cell mouth” (Cytosome)

list the two stages of development in protozoa

• - sporozoite

• - trophozoite

sporozoite

• - the infective stage of some protozoa

• - this is the stage where it enters the host

trophozoite

• - stage of protozoa while in host

• - active feeding and growth until protozoal cell division commences

most protozoa go through asexual reproduction. list the different types of asexual reproduction.

• - binary fission

• - budding

• - merogony

binary fission

one cell splits into 2 identical cells

budding

small new cell beds off parent

Merogony (Schizogony)

• - Trophozoite grows to large size while nucleus divides repeatedly resulting in a Meront (Schizont)

• - the Meront contains many separate organisms called Merozoites

• - the Meront eventually ruptures, liberating individual Merozoites