Extra 7 - Single celled organisms

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

2.7 - Single-celled organisms

Single-celled organisms

Organisms that consist of 1 cell -> very small

All life characteristics:

Breathing; To feed; Excrete; Observe; To move; Reproduction; To grow.

Examples: amoeba and paramecium (pantoffeldiertje)

Amoeba

a=no/none, moebe=form

Movement of the amoeba

by means of pseudopod 

(schijnvoetjes)

Amoeba

Pseudopod  moves towards food (bacterium).

Bacteria are enclosed and absorbed into the cell in a vesicle: food vacuole.

Bacterial digestion takes place here -> digested substances move to cytoplasm.

Undigested substances -> Away via cell membrane.

Paramecium 

Het Pantoffeldiertje

Paramecium

Cilia on cell membrane make wavy movement in water -> movement

Cilia move food towards the cell mouth pore. 

From there into food vacuole

undigested remains are removed via anal pore. 

Begrippen:

Single-celled organism

amoeba

pseudopod

paramecium

food vacuole

cilia

mouth pore

anal pore

Questions?

Read 2.7 - Single-celled organisms

Do Qs 1 and 2