|
nucleoli are present during which stage of mitosis? |
interphase |
|
cytokinesis often, but not always, accompanies which stage of mitosis? |
telophase |
|
during which stage of mitosis do chromosomes become visible? |
prophase |
|
centromeres divide and sister chromatids become full-fledged chromosomes during which stage of mitosis? |
anaphase |
|
spindle fibers attach to kinetochores during which stage of mitosis? |
prometaphase |
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during prophase, a homologous pair of chromosomes consists of what? |
two chromosomes and four chromatids |
|
dna replication produces two identical DNA molecules, called __________, which separate during mitosis. |
sister chromatids |
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after chromosomes condense, the __________ is the region where the identical DNA molecules are most tightly attached to each other. |
centromeres |
|
during mitosis, microtubules attach to chromosomes at the __________. |
kinetochores |
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in dividing cells, most of the cell’s growth occurs during __________. |
interphase |
|
the __________ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell division. |
mitotic spindles |
|
during interphase, most of the nucleus is filled with a complex of DNA and protein in a dispersed form called __________. |
chromatin |
|
in most eukaryotes, division of the nucleus is followed by __________, when the rest of the cell divides. |
cytokinesis |
|
the __________ are the organizing centers for microtubules involved in separating chromosomes during mitosis. |
centrosomes |
|
S phase of mitosis |
the cell is preparing for division and replicating DNA |
|
the G₂phase of mitosis |
the centrosome replicates |
|
early M phase of mitosis |
the centrosomes move away from each other toward the poles of the cell, in the process of organizing the formation of the mitotic spindle |
|
late M phase of mitosis |
the cell divides (cytokinesis), forming two genetically identical daughter cells |
|
are sister chromatids present in all or part of the G₁ phase of mitosis? |
no |
|
are sister chromatids present in all or part of the S phase of mitosis? |
yes |
|
are sister chromatids present in all or part of the G₂ phase of mitosis? |
yes |
|
are sister chromatids present in all or part of the early M phase of mitosis? |
yes |
|
are sister chromatids present in all or part of the late M phase of mitosis? |
no |
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is DNA condensed in all or part of the G₁ phase of mitosis? |
no |
|
is DNA condensed in all or part of the S phase of mitosis? |
no |
|
is DNA condensed in all or part of the G₂ phase of mitosis? |
no |
|
is DNA condensed in all or part of the early M phase of mitosis? |
yes |
|
is DNA condensed in all or part of the late M phase of mitosis? |
yes |
|
does the cell contain twice as much DNA in the S phase as it did in the G₁ phase of mitosis? |
yes |
|
does the cell contain twice as much DNA in the G₂ phase as it did in the G₁ phase of mitosis? |
yes |
|
does the cell contain twice as much DNA in the early M phase as it did in the G₁ phase of mitosis? |
yes |
|
does the cell contain twice as much DNA in the late M phase as it did in the G₁ phase of mitosis? |
yes |
|
mechanisms of prophase |
-cohesins join sister chromatids of duplicated chromosome -tubulins assemble into spindle microtubules |
|
mechanisms of prometaphase |
microtubules attach to kinetochores |
|
mechanisms of metaphase |
kinetochores are motionless in relation to poles of cell |
|
mechanisms of anaphase |
-cohesins break down -kinetochores move toward poles of cell |
|
mechanisms of telophase |
spindle microtubules disassemble |
|
during anaphase, the nonkinetochore microtubules __________ and move past each other, and the kinetochore microtubules __________. |
lengthen…shorten |
|
during prophase, the microtubules of the mitotic spindle __________. |
lengthen |
|
during telophase, the nonkinetochore microtubules __________. |
disassemble |
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