Question 1

The elongation of the cells of the neural plate occurs when ___________ become oriented with their long axes parallel to that of the cells.

Accepted Answer

The answer of The elongation of the cells of the...

Question 2

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

Accepted Answer

The answer of An element of the cytoskeleton is treated...

Question 3

A scientist observes the motion of a certain type of vesicle around the cell.She notices that vesicle movement ceases when colchicine is added to the culture medium.What conclusion can she draw?

Accepted Answer

The answer of A scientist observes the motion of a...

Question 4

The deletion of the creS gene in Caulobacter crescentus results in __________.

Accepted Answer

The creS gene in Caulobacter crescentus is responsible for the formation of the crescent shape of the cells. Deletion of this gene would result in cells that are no longer curved or crescent-shaped, but instead would look like straight rods.

Question 5

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 6

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

Accepted Answer

The answer of What would happen if you cultured a...

Question 7

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 __________.

Accepted Answer

Crescentin (CreS) forms bundled filaments that help to regulate the shape of some bacterial cells, giving them a highly curved shape similar to intermediate filaments in eukaryotic cells. Microfilaments and microtubules have different functions in eukaryotic cells, while titin and ParM are not involved in bacterial cell shape regulation.

Question 8

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 the bacterial cell analogous to the tubulin cytoskeleton during eukaryotic cytokinesis and is a homolog of tubulin that is found in nearly all prokaryotic cells.

Question 9

Toward the end of gastrulation in vertebrates,the ectodermal cells situated along the embryo's dorsal surface elongate and form a tall epithelial layer that is called the _________.

Accepted Answer

The neural plate is formed from ectodermal cells along the dorsal surface of the embryo during the process of neurulation, which follows gastrulation.

Question 10

How can the rate of movement generated by molecular motors be measured?

Accepted Answer

The answer of How can the rate of movement generated...

Question 11

What would happen if you cultured a frog embryo just after gastrulation in the presence of colchicine?

Accepted Answer

Colchicine disrupts microtubule function, which is necessary for cell division and cell elongation. In the neural plate, cells normally elongate and become constricted to form the neural groove and ultimately the neural tube, but without functional microtubules, these processes would be impaired or nonexistent.

Question 12

Why would the addition of an irreversibly binding ATP analog to an in vitro system for monitoring dynein molecular motors stop motor function?

Accepted Answer

The answer of Why would the addition of an irreversibly...

Question 13

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 14

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

Accepted Answer

In prokaryotes, FtsZ is the protein responsible for building the cytokinetic ring during cell division. It functions similarly to actin and tubulin in eukaryotic cells but is unique to prokaryotes. ParM and Crescentin are also proteins found in prokaryotes but they are involved in other cellular processes and not in cytokinesis.

Question 15

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 constriction is most likely caused by the contraction of a band of microfilaments that assemble in the cortical region of the cells just beneath the apical cell membrane. This type of contraction is known as apical constriction and is a common mechanism during embryonic development for shaping tissues and organs.

Question 16

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

The answer of The protein ParM has been shown to...

Quiz 9: The Cytoskeleton and Cell Motility

The elongation of the cells of the neural plate occurs when ___________ become oriented with their long axes parallel to that of the cells.

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

A scientist observes the motion of a certain type of vesicle around the cell.She notices that vesicle movement ceases when colchicine is added to the culture medium.What conclusion can she draw?

The deletion of the creS gene in Caulobacter crescentus results in __________.

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.

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

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 __________.

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.

Toward the end of gastrulation in vertebrates,the ectodermal cells situated along the embryo's dorsal surface elongate and form a tall epithelial layer that is called the _________.

How can the rate of movement generated by molecular motors be measured?

What would happen if you cultured a frog embryo just after gastrulation in the presence of colchicine?

Why would the addition of an irreversibly binding ATP analog to an in vitro system for monitoring dynein molecular motors stop motor function?

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

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

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 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 .

Quiz 9: The Cytoskeleton and Cell Motility

The elongation of the cells of the neural plate occurs when ___________ become oriented with their long axes parallel to that of the cells.

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

A scientist observes the motion of a certain type of vesicle around the cell.She notices that vesicle movement ceases when colchicine is added to the culture medium.What conclusion can she draw?

The deletion of the creS gene in Caulobacter crescentus results in __________.

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.

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

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 __________.

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.

Toward the end of gastrulation in vertebrates,the ectodermal cells situated along the embryo's dorsal surface elongate and form a tall epithelial layer that is called the _________.

How can the rate of movement generated by molecular motors be measured?

What would happen if you cultured a frog embryo just after gastrulation in the presence of colchicine?

Why would the addition of an irreversibly binding ATP analog to an in vitro system for monitoring dynein molecular motors stop motor function?

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

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

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 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.

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 .