4/14/15 Objective: How are protists classified? Do Now: What do you put/find in a junk drawer?

4/14/15

Objective: How are protists classified?

Do Now:

What do you put/find in a junk drawer?

What’s in a junk drawer?

Kingdom Protista is very diverse and where scientists place eukaryotes that are not animals, plants, or fungus.

Basic Characteristics of Protists

• Have eukaryotic cells (has a nucleus and organelles)

• Most are unicellular, algae is multicellular

• Very diverse kingdom

Protist Complexity

• The protist’s one cell must carry out many processes, so considered to be the most complex of eukaryotic cells

Protists are grouped by how they get nutrition

1. Animal-like protists (protozoans) - heterotrophs

2. Fungus-like protists are heterotrophs that decompose

3. Plant-like protists (algae) are autotrophs

Protozoans (Protozoa = “little animal”)

1. Heterotrophs

2. Can move like most animals• Different because they are unicellular

• Animal-like protists, resemble animals in 2 ways

1. Protozoans With FlagellaZooflagellates:

• Move by flagella• Reproduce asexually by binary fission

Specific Zooflagelletes 1. Trichonympha: live in the gut of termites,

enzymes digest cellulose in wood

2. Trypanosoma: parasitic, causes African Sleeping sickness spread by tsetse fly

3. Giardia: parasitic, lives in intestines, found in contaminated drinking water

2. Protozoans With Pseudopodia

Protozoans that move by extending lobes of cytoplasm

PseudopodPseudopod:

• Extensions of cytoplasm • Pseudopod = “false foot”

http://www.youtube.com/watch?v=7pR7TNzJ_pA

• Ex: Amoeba

3. Protozoans With CiliaCiliates:

• Found free-living in freshwater envts.

• Short hair-like projections called cilia to move and feed

3. Protozoans With CiliaParamecium :

• A ciliate with many rows of cilia for movement

http://www.youtube.com/watch?v=fmwN_mD7TvY

Paramecium

3. Protozoans With Cilia

Some ciliates have just clusters of cilia in tufts like Stentor who uses its cilia “tuft” to capture food

http://www.youtube.com/watch?v=pds8w7C9FEw

4. Protozoans Lacking Motility (Apicomplexans)

• Spore-forming parasites (Sporozoans)• No structure for movement, need host to

reproduce• Spore = reproductive cell

4. Protozoans Lacking Motility (Apicomplexans)

Plasmodium• The organism that causes malaria in humans,

spread by infected mosquitoes http://www.youtube.com/watch?v=JwsoK8O0lXE&list=PL0BFC02A301F673F3&index=3&feature=plpp_video

http://www.youtube.com/watch?v=RxZ7pdKqwZw&feature=bf_next&list=PL0BFC02A301F673F3&lf=plpp_video

http://www.youtube.com/watch?v=4aVUrGO97Zg&feature=bf_next&list=PL0BFC02A301F673F3&lf=plpp_video

http://www.youtube.com/watch?v=DPv0VstforY\