LAB: Protists

Question 1

Protists

Answer 1

• Belong to Domain Eukarya
• Algae and Protozoa

Question 2

​Algae

Answer 2

• Autotrophic organisms that photosynthesize
• Unicellular, multicellular, or colonial
• Important in aquatic and marine food chains

Question 3

Protozoa

Answer 3

• Heterotrophic single-celled eukaryotes
• Free-living or form symbiotic interactions
• Obtain nutrients through ingestion

Question 4

Euglena (algae)

Answer 4

• Are single-celled and have a long whip-like flagellum
• Have star-shaped contractile vacuoles to ride the cell of excess water
• Possess an eyespot to detect light intensity
• if light is not available, chloroplasts cease to function and collects food through its gullet
• Food is then digested by food vacuoles

Question 5

Green Algae, Spirogyra

Answer 5

• Green algae are thought to be the evolutionary precursors to plants
• Spirogyra: a filamentous green algae with cylindrical veg. cells that contain spiral shaped chloroplasts
• Sexual reproduction by conjugation
• Conjugation tube is formed
• Zygote is formed from the fusion of genetic material

Question 6

Red Algae

Answer 6

• mostly multicellular
• responsible for coral reefs

Question 7

Brown Algae (Sargassum)

also Fucus and Laminaria

Answer 7

• Multicellular (macroalgae)
• often called kelp
• important for marine life
• leaf-like blades
• stem-like stipes
• root-like holdfasts
• gas-filled floats
  *

Question 8

Paramecium

Answer 8

• covered with cilia used for locomotion
• uses oral groove to catch food
• food enters food vacuole and is digested
• leaves via anal pore
• contractile vacuoles to remove water
• reproduces by mitosis or conjugation
• Macronucleus (most cell process)
• micronucleus (sexual)

Question 9

Amoeba

Answer 9

• shapeless
• feed and use locomotion by pseudopodia
• ingest food by phagocytosis
  *

Question 10

Trypanosoma

Answer 10

• Use flagellum for locomotion
• Deadly pathogen
• Causes African Sleeping Sickness
• transmitted by tse tse flies (vectors)
• Undulating membrane