Lesson 26 - Life Functions in Protists

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protozoans

Animal-like protists. They are heterotrophic-they hunt and gather food.

flagellum

a long projection that looks much like a whip. as the flagellum whips back and forth, the organism is propelled through the water

pseudopod

sarcodines move using projections from the cyto plasm called...

cilia

Short, hairlike projections. This beats back and forth like oars to propel a cell through water.

conjugation

Two organisms join together and exchange some of their genetic material. New individuals are not formed, but new combinatins of genetic material created

spore

A tiny cell that can grow into an organism. They have complex life cycles that involve two or more diferent hosts.

algae

Plant-like protists. Contain chlorophyll and are able to conduct photosynthesis

protists

Diverse group of organisms. They are eukaryotic organisms found everywhere there is water.

Four groups of protozoans

zooflagellates, sarcodines, ciliates, and sporozoans

amoebas

an exampleof sarcodines. Can extend a thick ppseudopod from the center of the cell.

2 types of nucei of ciliates

Larger nucleus-known as the macronucleus, stores

Plasmodium vivax

A protozoan that causes malaria

Characteristics of six groups of plant-like protists

diatoms, dinoflagellates, euglenoids, red algae, brown algae, and green algae

Diatoms

Unicellular organisms found in both fresh water and salt water. Produce thin cell walss rich in slicon. Used in products such as toothpaste, filters, and scouring products

dinoflagellates

Half are autotrophs, the other heterotrophs. Have 2 flagella causing the protists to spin. Reproduce asexually through binary fission.

euglenoids

These protists are unicellular and live mainly in fresh water. Have chloroplasts needed for photosynthesis and no cell wall. Has a pigment known as the eyespot that helps them find sunlight for photosynthesis. Reproduce asexually through binary fission.

red algae

are multicellular. Less than 1 meter length. Live at great depths because they are very efficient at gathering light energy.

brown algae

Found in cool climates. Multicellular. In cool, shallow ocean waters. Largest and most complex algae. Can grow up to 100 meters long.

green algae

Have photosynthetic pigments and cell walls that are the same as those in plants. Found in fresh and salt water and in some moist land area. Some are single cells, some live in colonies, few are multicellular. Reproduce through a cycle of alternation of generations.

fungus-like protists

Similar to fungi in that they are heterotrophs, have cell walls, and use spores to reporduce. Include slime molds and water molds.

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