Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Microbiology > Test 1 - Myxococcus xanthus > Flashcards

Test 1 - Myxococcus xanthus Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

Myxococcus xanthus’ walls are Gram +/-

A

Gram -

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is its organization in terms of flagella? Is it immobile?

A

No flagella, BUT can move with “gliding motility”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is Gliding Motility?

A

Smooth movement of cell on a surface without need for flagella, which creates a slime trail to aid movement.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What two different types of motility are there for Myxococcus xanthus?

A
  1. A-Motility (Adventurous)

2. S-Motility (Social)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When does Myxococcus xanthus perform A-Motility?

A

By single cell, on firm surface.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What protein aids A-Motility? How does it aid motility?

A

CGLB, which may release surfactants at back of cell. Surfactant disrupts H-bond and hence surface tension of water. Surfactant allows Myxococcus xanthus to move in the opposite direction of the surfactant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

When does Myxococcus xanthus perform S-Motility? What does it require? What does this body part do?

A

In group. It requires a pillus, which allows the bacteria to grab onto other cells.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

T/F: In a colony of Myxococcus xanthus, all cells are performing S-Motility

A

F. The edges are performing A-motility.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Is it an aerobe or an anaerobe? What metabolism does it perform?

A

Aerobe. No fermentation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

It is a (chemo/photo)(heterotroph/autotroph)

A

Chemoheterotroph.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Where do Myxococcus xanthus get their food from?

A

Microorganism/fungi and dead organisms.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How is Myxococcus xanthus like Bacillus anthracis?

A

They both secrete digestive protein, which lyse cells in contact. It also take up peptides from organisms to use for energy and source of molecules.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What do Myxococcus xanthus secrete to hunt? Why? (2)

A
  1. Digestive proteins to lyse cells

2. Antibiotics to disturb enzyme

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does Myxococcus xanthus’ hunting habit fit into its behavior? (2)

A

Because it hunts in packs, it

  1. Uses S-Motility to swarm prey, and
  2. Constantly secrete digestive enzymes for more effective killig.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Does Myxoccocus xanthus grow? How?

A

Yes, by elongation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Does Myxoccocus xanthus develop? How?

A

Forms spores (NOT ENDOSPORES) when triggered by stress (- nutrient)

17
Q

What are the 3 steps of Myxococcus xanthus development into spores?

A
  1. Sense starvation
  2. Form aggregate
  3. Differentiate
18
Q

What happens in step 1 of Myxococcus xanthus development into spores? What is the step called?

A

Sense Starvation: - metabolic rate/energy –> development

19
Q

What happens in step 2 of Myxococcus xanthus development into spores? How does it work? (Give specific chemical) What is the step called?

A

Form Aggregate: Starving cells secrete Phosphatidylethanolamine (PE), and the cells chemotax toward ++ [PE]

20
Q

What happens in step 3 of Myxococcus xanthus development into spores? (5 Steps) What is the step called?

A

Differentiation: After cells form a mound…

  1. Some cells sacrifice themselves for food for others
  2. 15 new genes get transcribed for spore formation.
  3. Myxospores form.
  4. Stalk made of slime lifts spore up off surface.
  5. Germination.
21
Q

What is the name of the spore?

A

Myxospore.

22
Q

What causes germination? What happens then?

A

Food presence. Spore bursts open.

23
Q

What are advantages of forming Myxospores? (List 3) Give explanation if needed.

A
    • Metabolism
  2. Heat and UV resistance, due to carotenoids, which is a spore-specific protein that absorbs UV rather than letting it damage DNA
  3. Spores release at once many bacteria, creating a pack ready-made.
24
Q

How does Myxococus xanthus reproduce?

A

Binary fission.

25
Q

What is Myxococcus xanthus’ environment?

A

Soil.

26
Q

What are 2 adaptations to environment?

A
  1. Richness in µorganisms –> constantly releasing digestive enzymes.
  2. No need for flagellum because no water.
27
Q

Myxococcus xanthus can chemotax. What can it chemotax toward?

A

Phosphatidylethanolamine (PE).

28
Q

Myxoccocus xanthus has 2 component system. Its receptor is…, specifically named…

A

MCP, specifically named FrzCD

29
Q

Myxoccocus xanthus has 2 component system. Its Sensor Kinase is…

A

FrzE

30
Q

Myxoccocus xanthus has 2 component system. Its Response Regulator is…

A

FrzZ and FrzS

31
Q

What is dissimilar to chemotaxis of Myxococcus xanthus compared to that of Escheria coli?

A

No flagella– exact mechanism of movement unknown.

Microbiology (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions