What's the correct order of bacterial cell division?
1- Invagination of the plasma membrane
2- Z ring is anchored to the plasma membrane
3- Cell wall-synthesizing machinery is assembled
4- Formation of the Z ring
5- Constriction of the Z ring - Answer-4- Formation of the Z ring
2- Z ring is...
MCB 3020 Exam 2 Questions with
Correct Answers
What's the correct order of bacterial cell division?
1- Invagination of the plasma membrane
2- Z ring is anchored to the plasma membrane
3- Cell wall-synthesizing machinery is assembled
4- Formation of the Z ring
5- Constriction of the Z ring - Answer-4- Formation of the Z ring
2- Z ring is anchored to the plasma membrane
3- Cell wall-synthesizing machinery is assembled
5- Constriction of the Z ring
1- Invagination of the plasma membrane
In the Caulobacter crescentus chromosome partitioning system, the ParB/parS complex
is present on the chromosome _____. - Answer-Near the origin of replication
The MinCDE complex directs _____ to the middle of the cell to position septation
properly. - Answer-Z ring formation
In general, which of the following microbes types tends to have a single circular
chromosome composed of DNA? - Answer-Bacteria
In rapidly growing E. coli cells, DNA replication takes about _____. - Answer-40 minutes
Increasing the size of peptidoglycan during cell division is a challenge because _____. -
Answer-Its strength must be maintained when new subunits are added
In the example of interdomain communication between Rhizobium species and
leguminous plants, the advantage of the successful interaction for the plant is _____. -
Answer-secretion of amino acids by the Rhizobium
The cytoskeletal protein _________ is needed for vibrioid cells to develop and maintain
the curvature that characterizes their shape. - Answer-Crescentin/CreS
Which two of the following proteins are components of the E. coli divisome?
FtsA
FtsZ
SlmA
ParB
MinCDE - Answer-FtsA
FtsZ
,Where does peptidoglycan synthesis start in bacteria? - Answer-Cytoplasm
The Z ring is positioned in the center of the cell by which protein complex? - Answer-
MinCDE
Which two of the following terms describe peptidoglycan? - Answer-Rigid & Elastic
Which protein is not important in maintaining the cell shape of vibrios? - Answer-MinC
Vibrioid-shaped cells derive their cell shape from _____. - Answer-asymmetric cell wall
growth
When fresh growth medium is inoculated with a microbial culture there is typically a
period of adaptation called the ________ phase. - Answer-Lag
Biologists express the degree to which water is available to microbes in solution as
______. - Answer-Water Activity
To maintain a neutral internal pH, which type of organism might use a proton transporter
to pump protons out of the cell? - Answer-Acidophile
Which of the following best describes the movement of AHL (N-acylhomoserine lactone)
across the plasma membrane of a bacterial cell? - Answer-It is freely diffusible.
Bacteria and archaea mainly reproduce by ________ _________ - Answer-Binary
Fission
The cell cycle is ______. - Answer-the events from formation of a new cell through the
next division
Crescentin, the shape-determining protein of vibrioid cells, localizes to _____. - Answer-
one side of the cell
How many origins of replication are found on most bacterial chromosomes? - Answer-
One
The ParA protein of Caulobacter crescentus _____ to orient the positioning of the newly
replicated chromosome. - Answer-localizes near the opposite pole
Which process forms cross walls between daughter cells during cytokinesis? - Answer-
Septation
What is the correct description of the process known as cytokinesis? - Answer-division
of the cytoplasm into the daughter cells
, The cytoskeletal protein FtsZ polymerizes to form the ________ _________ that marks
the site of septum formation in bacteria and archaea. - Answer-Z Ring
The Z ring is inhibited from forming at any location other than at midcell by the
movement of the _____ proteins. - Answer-MinCDE
A mechanism called ________ ________ ensures that the Z ring forms only after most
of the daughter chromosomes have segregated. - Answer-Nucleoid Occlusion
The component of the bacterial cell envelope that protects the cell from swelling and
bursting from turgor pressure is ____________. - Answer-Peptidoglycan
The group of enzymes responsible for peptidoglycan synthesis are notable for their
binding to ______. - Answer-Penicillin
Which group of enzymes is required for limited peptidoglycan degradation, so that new
units can be inserted during cell growth? - Answer-Autolysins
Which two of the following statements are evidence in support of the importance of
MreB in determining cell shape in rod-shaped bacteria?
1- Coccoid-shaped cells lack proteins in the MreB family.
2- MreB proteins polymerize to form filaments that act at the plasma membrane.
3- MreB proteins interact directly with the FtsZ ring at midcell.
4- Rod-shaped cells in which MreB has been depleted assume a spherical shape. -
Answer-1- Coccoid-shaped cells lack proteins in the MreB family.
4- Rod-shaped cells in which MreB has been depleted assume a spherical shape.
The part of the microbial growth curve when cells are growing and dividing at their
maximal rate is called the ________________ phase. -
Answer-Exponential/Log/Logarithmic
The part of the microbial growth curve when cells reach their maximum density is called
the _________ phase. - Answer-Stationary
The part of the microbial growth curve when cell density decreases is called the
______. - Answer-Death phase
The length of time that it takes a culture to double in cell number is called the _______
_______. - Answer-Doubling time
The growth rate constant, k, is expressed in units of ______. - Answer-Generations per
hour
he ParA protein of Caulobacter crescentus ________ to orient the positioning of the
newly replicated chromosome. - Answer-localizes near the opposite pole
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