Quiz 2

Question 1

What happens when a bacterium detects an attractant?

Answer 1

CheA kinase activity decreases, CheY is dephosphorylated, and the flagella rotate counterclockwise (CCW)

Question 2

What is rrn operon copy number

Answer 2

gene copy variation that allows rapid response to nutrient availability

Question 3

What is Phosphotransferase system

Answer 3

System that inhibits lactose uptake when glucose is present

Question 4

What is µ

Answer 4

Correct match:
measures how fast a bacterial population is growing independent of time

Question 5

What is Diauxic growth

Answer 5

Correct match:
Condition with two distinct phases of growth due to use of preferred carbon sources

Question 6

What is Shift down

Answer 6

Condition where RNA and protein synthesis stop immediately but DNA synthesis briefly continues

Question 7

What is Catabolite repression

Answer 7

Regulatory system where glucose prevents expression of genes for metabolism of alternative sugars

Question 8

What are the three lipid-based structures in bacteria that can be glycosylated?

Answer 8

LPS LOS Teichoic acids

Question 9

True or False
FtsZ is required for the localization of other Fts proteins to the bacterial cell division site

Answer 9

Correct match:
True

Question 10

True or False
FtsZ is a tubulin-like protein that forms a ring at the future site of septum formation

Answer 10

Correct match:
True

Question 11

True or False
Binary fission typically produces daughter cells that are unequal in size and metabolic potential

Answer 11

Correct match:
False

Question 12

True or False
Filamentous temperature-sensitive (fts) mutants divide normally at restrictive temperatures

Answer 12

Correct match:
False

Question 13

True or False
In the absence of FtsZ, bacterial cells show normal septation at the cell midpoint

Answer 13

Correct match:
False

Question 14

True or False
Individual bacterial cell growth involves an increase in both cell length and volume before division

Answer 14

True

Question 15

What is the Divisome

Answer 15

Correct match:
Protein complex responsible for bacterial cell division

Question 16

What is the MinE protein

Answer 16

Correct match:
Protein that guides FtsZ ring formation at the cell midpoint

Question 17

What is the FtsZ protein

Answer 17

Cytoskeletal protein that forms a ring at the septation site

Question 18

What is the Generation time (g)

Answer 18

Correct match:
Time elapsed for a bacterial cell to complete one division

Question 19

What is the ZipA protein

Answer 19

Anchors and stabilizes FtsZ polymers to the membrane

Question 20

What is the Autolysins

Answer 20

Enzyme that creates openings in the bacterial cell wall

Question 21

What is the MinD protein

Answer 21

Protein that inhibits septation and oscillates from pole to pole

Question 22

True or false?
CheY must be phosphorylated in order to promote counterclockwise (CCW) flagellar rotation

Answer 22

Correct match:
False

Question 23

True or false?
Chemotaxis allows bacteria to respond to environmental signals such as nutrients, pH, and oxygen levels

Answer 23

Correct match:
True

Question 24

True or false?
Dephosphorylation of CheY by CheZ results in smooth swimming behavior

Answer 24

Correct match:
True

Question 25

True or false? Attractants cause bacteria to swim smoothly by increasing CheA kinase activity

Answer 25

Correct match: False

Question 26

True or false? Receptor adaptation involves both methylation and demethylation of chemoreceptors

Answer 26

Correct match: True

Question 27

True or false? In the absence of an attractant, bacterial cells move randomly by tumbling due to clockwise (CW) flagellar rotation

Answer 27

Correct match: True

Question 28

True or false? CheR methylates chemoreceptors to help reset the signaling system after exposure to an attractant

Answer 28

Correct match: True

Question 29

True or false? Biofilm formation is unrelated to a bacterium’s ability to sense and respond to its environment

Answer 29

Correct match: False