Protists

Question 1

Describe Protists flagellum

Answer 1

Contains 20 microtubules
9 & 2 arrangement 
Made of the protein tubulin 
Directed by a basal body 
Undulates

Question 2

Describe Prokaryote flagellum

Answer 2

Made up of the protein flagellin
Located outside the cell membrane
It rotates

Question 3

Describe the 3 forms of nutrition of Protists

Answer 3

Photoautotrophs- photosynthetic

Heterotrophs- parasites

Mixotrophs- phototrophic and heterotrophic

Question 4

Explain what pseudopodia are

Answer 4

Cytoplasm filled projections used for motility and feeding

Question 5

List 6 functions involved in sexual reproduction of Protists

Answer 5

1- chromosomes coil
2- chromosomes with a centromere for attachment of microtubules
3- arrangement of microtubules into a spindle
4- formation of diploid cells
5- meiosis
6- syngamy

Question 6

Endosymbiosis definition

Answer 6

One organism living inside another

Question 7

3 ways endosymbiosis played an important role in evolution

Answer 7

1- mitochondria evolved by endosymbiosis of an aerobic Prokaryote
2- chloroplasts evolved by endosymbiosis of a photosynthetic Cyanobacterium
3- chloroplasts of some Protists evolved by endosymbiosis of algae (secondary endosymbiosis)

Question 8

Describe and name 3 extracellular structures present in Protists

Answer 8

Pellicle= flexible protein sheath

Cell wall composed of cellulose

Exoskeleton= shell, test, or lorica

Question 9

Describe the steps involved, and ploidy of each stage, in alternation of generations

Answer 9

Sporophyte 2n - meiosis: 2n to n+n gametophytes - fertilization/syngamy: n+n =2n - zygote 2n - sporophyte