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Microbial Physiology > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

Our model organism, E. coli, is which of the following:

A

Chemoorganotroph

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2
Q

Peptidoglycan synthesis occurs where within the cell?

  • cytoplasm
  • cell membrane
  • cell wall
  • cytoplasm and cell membrane
  • cytoplasm and cell wall
  • all of the above
A

ALL of the above

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3
Q

How does penicillin inhibit cell division?

A

Penicillin mimics the pentapeptide and covalently binds transpeptidase preventing the addition of peptidoglycan

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4
Q

What is the structure of peptidoglycan monomers?

A

N-acteylglucosamine -> N-acteylmuramic acid -> pentapeptide crosslinker

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5
Q

What is the condensed chromosome of a bacterium called?

A

Nucleoid

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6
Q

Which of the following is an accumulation of extracellular material visible by microscopy?

A

capsule

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7
Q

The rfa genes are involved in the synthesis of what molecule?

A

Lipopolysaccharide

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8
Q

What microbial product is important for biofilm formation?

A

Slime Layer

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9
Q

Which of the following best describes a bacterium’s movement?

A

Zig-Zag or circular random walk

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10
Q

What type of export pathway is used to form the flagella filament?

A

Type III

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11
Q

Which of the following is NOT a component of the bacterial flagella/chemotaxis?

A

Axoneme

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12
Q

In E. coli, smooth directional swimming is associated with…

A

CCW flagellar rotation

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13
Q

How do bacteria know when to change direction?

A

Stimulus of MCPs

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14
Q

Superoxide dismutase are enzymes that dissipates superoxide to hydrogen peroxide and oxygen and are present in aerobic organisms.

A

True

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15
Q

Which of the following secretion systems autotransport their cargo.

A

Type V

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16
Q

Which of the following statement is true for Aerobic bacteria:

A

oxygen serves as the terminal electron acceptor

17
Q

Following is NOT true for Mesophilic bacteria

A

Maximum temperature at which bacterial can grow is >80 °C

18
Q

Which of the following transport mechanisms does not utilize energy?

A

Facilitated Diffusion

19
Q

Which of the following transport mechanisms modifies the transported material?

A

Group Transport

20
Q

The F0-F1 ATPase is an example of what type of transporter?

A

Ion driven

21
Q

Catalase are the enzymes:

A

All the statements are true

22
Q

How do Gram-positive bacteria secrete material?

A

Sec Pathway

23
Q

Clostridium tetani and botulism neurotoxin (BoNT) of Clostridium botulinum both are A-B toxin composed of heavy chain (B subunit) and light chain (A-subunit). Both TeNT and BoNT inhibit neuroexocytosis.

A

True

24
Q

Which of the following is not an example of Neurotoxin

A

Cholera toxin

25
Q

A-B toxins act as autotransporters. What class of toxin are these?

A

Exotoxins

26
Q

Which of the following is True about injected Toxins

A

They are secreted directly into the host cytoplasm by Type II and VI systems

27
Q

Which is an incorrect statement about Toxins

A

toxins are beneficial for the host

28
Q

Which of the below-mentioned statements are not correct about Cholera Toxin.

A

It increases absorption of Na+

29
Q

Bacteria use quorom sensing for what purpose?

A

To communicate with other bacteria in the area to work together

30
Q

Pore forming Toxins secreted by bacteria kills the host cell by:

A

by forming pores in the cell membranes

31
Q

Which of the following is NOT true about Anthrax toxin from Bacillus anthracis

A

It is an endotoxin

32
Q

Which of the following statements are true about Gliding Motility

A

All are true (select all)

except Type IV Pilli

33
Q

The growth of aerotolerant organisms is frequently enhanced by culture on media containing blood or other natural materials but contain catalase or peroxidase

A

True

34
Q

Complete LPS molecule is made up of

A 
o-antigen 
core polysaccharide
disaccharide diphosphate
fatty acids 
(a, b, c and d)
35
Q

Select TRUE statements about Gram-Negative Bacteria

A

outer cell membrane
LPS represent one of the most important features of gram-negative cells
presence of LPS causes septic shock
(a, b, c)

36
Q

Teichoic and Lipoteichoic acids are found in Gram-Negative bacteria

A

False

37
Q

Capsule does not have well-defined boundaries and is not visible by Microscopy

A

False

38
Q

Swarming Motility is a

A

rapid and coordinated movement of a bacterial population across a solid or semi-solid surface
Coordinated quorum sensing
Involves periodic morphological changes at 1-2 hr intervals
Swarming motility are produced from relatively short and sparsely flagellated cells
(ALL of the above)

Microbial Physiology (2 decks)

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