Question 1

The deletion of the mreB gene in Escherichia coli results in __________.

Accepted Answer

The mreB gene in Escherichia coli is responsible for maintaining the rod shape of the cells. When this gene is deleted, the cells lose their rod shape and become spherical.

Question 2

The protein Crescentin (CreS)has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

Accepted Answer

Crescentin (CreS) forms bundled filaments which are intermediate filaments, that resemble those in eukaryotic cells.

Question 3

The protein ParM has been shown to play a role in plasmid segregation during bacterial cell division analogous to the action of ___________during mitosis and is structurally similar to __________.

Accepted Answer

ParM plays a role similar to microtubules during mitosis and is structurally similar to actin.

Question 4

After they have elongated, the cells of the neural epithelium become constricted at one end, causing them to become wedge shaped and leading the entire layer of cells to curve inward. What causes this constriction?

Accepted Answer

The wedge-shaped constriction of elongated neural epithelial cells is caused by the contraction of a band of actin filaments that assemble in the cortical region of the cells just beneath the apical cell membrane. This leads to the entire layer of cells curving inward, which is an important step in the formation of the neural tube during embryonic development.

Question 5

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

Accepted Answer

The cytokinetic ring is formed by the FtsZ protein in prokaryotes, which plays a similar role to tubulin in eukaryotic cells. Actin, ParM, and Crescentin are not involved in cytokinesis in prokaryotes.

Question 6

The protein _________ has been implicated in regulating the shape of some bacterial cells; it is expressed in rod-shaped and helical bacteria. It resembles __________in structure.

Accepted Answer

MreB has been implicated in regulating the shape of some bacterial cells and resembles actin in structure.

Question 7

The protein FtsZ acts in the bacterial cell analogously to the ______ cytoskeleton during eukaryotic cytokinesis and is a(n)_________ homolog that is found in nearly all prokaryotic cells.

Accepted Answer

FtsZ acts in bacterial cell division similarly to the cytoskeletal protein tubulin in eukaryotic cytokinesis, and is considered a homolog of tubulin that is present in nearly all prokaryotic cells.

Quiz 9: The Cytoskeleton and Cell Motility

The deletion of the mreB gene in Escherichia coli results in __________.

The protein Crescentin (CreS) has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

The protein ParM has been shown to play a role in plasmid segregation during bacterial cell division analogous to the action of _during mitosis and is structurally similar to .

After they have elongated, the cells of the neural epithelium become constricted at one end, causing them to become wedge shaped and leading the entire layer of cells to curve inward. What causes this constriction?

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

The protein _ has been implicated in regulating the shape of some bacterial cells; it is expressed in rod-shaped and helical bacteria. It resembles __in structure.

The protein FtsZ acts in the bacterial cell analogously to the cytoskeleton during eukaryotic cytokinesis and is a(n) ___ homolog that is found in nearly all prokaryotic cells.

Quiz 9: The Cytoskeleton and Cell Motility

The deletion of the mreB gene in Escherichia coli results in __________.

The protein Crescentin (CreS) has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

The protein ParM has been shown to play a role in plasmid segregation during bacterial cell division analogous to the action of ___________during mitosis and is structurally similar to __________.

After they have elongated, the cells of the neural epithelium become constricted at one end, causing them to become wedge shaped and leading the entire layer of cells to curve inward. What causes this constriction?

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

The protein _________ has been implicated in regulating the shape of some bacterial cells; it is expressed in rod-shaped and helical bacteria. It resembles __________in structure.

The protein FtsZ acts in the bacterial cell analogously to the ______ cytoskeleton during eukaryotic cytokinesis and is a(n) _________ homolog that is found in nearly all prokaryotic cells.

The protein ParM has been shown to play a role in plasmid segregation during bacterial cell division analogous to the action of _during mitosis and is structurally similar to .

The protein _ has been implicated in regulating the shape of some bacterial cells; it is expressed in rod-shaped and helical bacteria. It resembles __in structure.

The protein FtsZ acts in the bacterial cell analogously to the cytoskeleton during eukaryotic cytokinesis and is a(n) ___ homolog that is found in nearly all prokaryotic cells.