Lecture 8 Flashcards
Describe Protozoans
- Unicellular
- Component of plankton
- Cause many diseases
Protozoan disadvantages of being unicellular
Size is limited
- Less things to eat
- More things that can eat them
Shorter Lifespan
- Any damage can be fatal
- Means less time for reproduction
No division of labor
- No differentiated cells
Explain size limitation of cells
Due to SA/V ratio, inside of cell becomes too big for the cytoplasmic membrane to support it
Protozoan advantages of being unicellular
Rapid reproduction
- Both sexual and asexual are quick
Minimal resources required
Describe unicellular Eukaryotes
Complete organisms
Mostly motile
Require moisture
Cause many diseases
What are the modes of locomotion
- Flagella
- Cilia
- Pseudopodia
Describe flagella
- Whip-like organelle
- Used to move
Cilia
- Hair-like organelle
- Found on many animal cells
- Used to move particles along cell surace
- Unicellular organisms can use this for motion
Peudopodia
- Temporary cytoplasmic protrusion
- used to move or phagocytosis
- Usually in amoebas
What is an Undulipodium
- A 9+2 (microtubule) organelle
- FOund in cilia and flagella
- makes them morphologically the same
Water propulsion by cilia/flagella
- Cilia: propel water parallel to cell surface
- Flagella: propel water parallel to flagellum axis
Pseudopodia cytoplasm
- Not homogenous
- Consists of:
- Ectoplasm semi solid outer layer
- Endoplasm inner fluid
- Endoplasm flows forward to pseudopod
- Solidifies into ectoplasm
Protozoan Taxonomy:
- Classified by body type
- Not necessarily monophyletic
- Can be:
- Flagellates
- Ciliates
- Amoebas
What are foraminifera
- Amoeboid protozoans
- Have shell called test
Types of feeding in Umicellular eukaryotes:
- Autotrophs
- Heterotrophs
- Both (ex: euglena)
- THis course will cover heterotrophs
