Ch. 5 - Microbial Diversity: Eukaryotic Microbes

Question 1

Diatoms

Answer 1

single-celled algae that live in houses made of glass

Only known organism to have transparent cell walls made of opaline silica

Question 2

Medical significance of algae

Answer 2

Algae rarely leads to disease, but it can cause a variety of microbial intoxications

Question 3

Dinoflagellets

Answer 3

cause red tides which lead to paralytic shellfish poisoning

Question 4

2 Life stages of protozoa

Answer 4

1) Trophozoite: motile, feeding, dividing

2) Cyst: nonmotile, dormant, survival

Question 5

Medical significance of protozoa

Answer 5

Parasytic, can lead to malaria

Question 6

Locomotion of :
Amebae
Ciliates
Flagellates
Sporozoa

Answer 6

Amebae - false feet
Ciliates - hairlike projections
Flagellates - whiplike flagella
Sporozoa - no visible means of locomotion

Question 7

Cell walls of fungi contain ___

Answer 7

Chitin

Question 8

Hyphae

Answer 8

long, branching, filamentous structure that form a mass called mycelium

Question 9

Septate hyphae

Answer 9

“dividers” between hyphae cells

Question 10

How do we classifiy fungi?

Answer 10

Based on mode of reproduction and type of sexual spore produced

Question 11

Fungi reproduction (3)

Answer 11

1) Budding
2) Hyphal extension
3) Spore formation

Question 12

2 factors to distinguish yeast vs bacteria

Answer 12

Yeast are larger and oval

Yeast are often seen budding; whereas, bacteria don’t bud

Question 13

Mould:
Aerial hyphae
Vegetative hyphae

Answer 13

Aerial - Reproductive. Extends above the surface of whatever the mould grows on.

Vegetative - grows beneath the surface

Question 14

Medical significance of moulds

Answer 14

produce antibiotics (penicillin) and enzymes

Question 15

Dimorphic fungi

Answer 15

Live as yeast (>37 degrees in vivo) or mould (25 degrees) depending on conditions

Question 16

What are lichens

Answer 16

algae + fungus in a mutualistic relationship