Unicellular organisms

Prokaryotes (no nuclear membrane)

 Can appear in different shapes

Cell walls made of peptidoglycan

Reproduce by binary fission

Many swim by using flagella

Bacillus

-Coccus

How does bacteria reproduce?

Eukaryotes (have a nucleus/nuclear membrane)

Unicellular and Multicellular

Cell walls composed of chitin

Unicellular are larger than bacteria

Typically molds

Obtain nurishment by absorbing organic material from environment

What makes up the cell walls of fungi?

Yeasts

The unicellular forms of fungi;

Oval microorganisms that are larger than bacteria.

Some can make their own by photosynthesis;

Some can derive nutritions from organic substances.

Unicellular

Eukaryotic

Move by pseudopods, flagella, or cilia.

Live as free entities or parasites

Reproduce sexually or asexually

Extensions of their cytoplasm called pseudopods

(false feet)

Parasites absorb or ingest organic compounds from their environment.

Free entities?

long and short appendages

(respectively)

Extremely small

Contains a core made of only one nucleic acid (DNA or RNA)

Reproduce only by using the cellular machinery of other organisms.

Are they living or dead?

Yes: when they multiply within host cells they infect.

No: because outside of living hosts they are inert.