Bio 211 Chapter 12 Review
Are sister chromatids present in all or part of G1
no
Are sister chromatids present in all or part of end of M (late anaphase -------> telophase)
no
Does the cell contain twice as much DNA in this place as it did in the G1 phase? G1
no
Is the DNA condensed in all or part of G1
no
Is the DNA condensed in all or part of G2
no
Is the DNA condensed in all or part of S
no
microtubules attach to kinetochores
prometaphase
cohesions join sister chromatids of duplicated chromosome
prophase
tubulins assemble into spindle microtubules
prophase
DNA replication produces two identical DNA molecules, called _________ which separate during mitosis.
sister chromatids
spindle microtubules disassemble
telophase
During interphase, most of the nucleus is filled with a complex of DNA and protein in a dispersed form called _________
chromatin
True or False In animals: tubular or tubulin-like molecules function in binary fission (in bacteria) or cytokinesis (in animals and plants)
false
True or False In bacteria: the presence of a cell wall prevents the cell from dividing by constriction
false
True or False In plants: cells divide by constriction of a ring protein.
false
The ____________ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell division.
mitotic spindle
Cells will usually divide if they receive the proper signal at a checkpoint in which phase of the cell cycle?
G1
Which of the following statements are true of cytokinesis in plant cells? Select all that apply -The cell plate consists of the plasma membrane and cell wall that will eventually separate the two daughter cells. -The plasma membrane of the parent cell grows inward, eventually joining with the cell plate. -Vesicles from the Golgi apparatus move along microtubules, coalesce at the plane of cell division, and form a cell plate. -After chromosome separation is complete, a network of microfilaments forms near the plane of cell division that will separate the two new cells.
The cell plate consists of the plasma membrane and cell wall that will eventually separate the two daughter cells. Vesicles from the Golgi apparatus move along microtubules, coalesce at the plane of cell division, and form a cell plate.
True or False In animals: the presence of a cell wall prevents the cell from dividing by constriction
false
Why do some species employ both mitosis and meiosis, whereas other species use only mitosis? -They need both if they are producing plant gametes. -They need only meiosis if they produce egg cells. -They need only mitosis to make large numbers of cells such as sperm. -A single-celled organism only needs mitosis. -They need meiosis if the cells are producing organs such as ovaries.
They need both if they are producing plant gametes
True or False In bacteria: cells divide by constriction of a ring protein.
True
cohesions break down
anaphase
kinetochores move toward poles of cell
anaphase
Does the following happen in bacteria only, eukaryotes only, or both? Chromosome separation begin at the origin of replication of DNA
bacteria
Does the following happen in bacteria only, eukaryotes only, or both? chromosomes replicate before cell division
both
Does the following happen in bacteria only, eukaryotes only, or both? replicated chromosomes separate by attaching to some other structural feature of the cell
both
After chromosomes condense, the _________ is the region where the identical DNA molecules are most tightly attached to each other.
centromere
The __________ are the organizing centers for microtubules involved in separating chromosomes during mitosis.
centrosome
Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere with cell division? -formation of the cell plate -formation of the mitotic spindle -DNA replication -cleavage -binary
cleavage
In most eukaryotes, division of the nucleus is followed by ___________, when the rest of the cell divides.
cytokinesis
During telophase, the nonkinetochore microtubules _______.
disassemble
Does the following happen in bacteria only, eukaryotes only, or both? before separation, duplicated chromosomes condense
eukaryotes
Does the following happen in bacteria only, eukaryotes only, or both? nuclear envelope fragments, permitting chromosome separation.
eukaryotes
Does the following happen in bacteria only, eukaryotes only, or both? two copies of the duplicated chromosome are attached at their centromeres before separating
eukaryotes
In dividing cells, most of the cell's growth occurs during __________
interphase
During mitosis, microtubules attach to chromosomes at the ___________
kinetochore
During prophase, the microtubules of the mitotic spindle __________.
lengthen
During anaphase, the nonkinetochore microtubules _______ and move past each other, and the kinetochore microtubules _________.
lengthen shorten
kinetochores are motionless in relation to poles of cell
metaphase
True or False In animals: cells divide by constriction of a ring protein.
true
True or False In bacteria: tubular or tubulin-like molecules function in binary fission (in bacteria) or cytokinesis (in animals and plants)
true
True or False In plants: the presence of a cell wall prevents the cell from dividing by constriction
true
True or False In plants: tubular or tubulin-like molecules function in binary fission (in bacteria) or cytokinesis (in animals and plants)
true
Are sister chromatids present in all or part of G2
yes
Are sister chromatids present in all or part of S
yes
Are sister chromatids present in all or part of beginning of M (prophase ----> early anaphase)
yes
Does the cell contain twice as much DNA in this place as it did in the G1 phase? G2
yes
Does the cell contain twice as much DNA in this place as it did in the G1 phase? S
yes
Does the cell contain twice as much DNA in this place as it did in the G1 phase? beginning of M (prophase ----> early anaphase)
yes
Does the cell contain twice as much DNA in this place as it did in the G1 phase? end of M (late anaphase -------> telophase)
yes
Is the DNA condensed in all or part of beginning of M (prophase ----> early anaphase)
yes
Is the DNA condensed in all or part of in all or part of end of M (late anaphase -------> telophase)
yes