Protists & Endosymbiotic Theory

Question 1

How did Eukaryotes develop?

Answer 1

• endosymbiotic theory suggests that eukaryotic cells are the result of the symbiotic relationship between two or more prokaryotic cells.

Question 2

Pieces of evidence (protists)

Answer 2

• it is believed that membrane - bound organelles - are ancestors of once free - living prokaryotes
• two organelles present the strongest evidence (chloroplasts and mitochondrion)

Question 3

Comparing these organelles to prokaryotes (protists)

Answer 3

• similar membranes
• similar ribosomes
• reproduce by binary fission
• contain their own circular DNA with similar genes

Question 4

What is the cell type of Protists?

Answer 4

Eukaryotic

Question 5

How many cells does protists have? (Multicellular or unicellular?)

Answer 5

• mostly unicellular but some are multicellular

Question 6

What is the metabolism of protists?

Answer 6

Autotrophs or heterotrophs

Question 7

Protist Reproduction

Answer 7

• some protists can use sexual reproduction = conjugation
• all protists can use asexual reproduction = binary fission

Question 8

What are the types of protists?

Answer 8

1. Animal - like
2. Plant - like
3. Fungus - like

Question 9

Protist Motility

Answer 9

• they are motile due to the following : flagella, pseudopods, cilia.

Question 10

Uses of protists

Answer 10

• seaweed (algae)
• carrageenan
• diatoms
• algae
• trichomonas hominis

Question 11

Identify 2 uses of protists:

Answer 11

• they serve as the foundation of the food chain
• they decompose

Question 12

What is the endosymbiotic theory? (Show evidence)

Answer 12

• one cell engulfed another cell, it survived then became the internal part of the host cell.

Evidence:
- mitochondria (powerhouse of the cell)
- chloroplast (photosynthesis)