Nucleoli are present during |
interphase |
Cytokinesis often, but not always, accompanies |
telophase |
Chromosomes become visible during |
prophase |
Centromeres divide and sister chromatids become full-fledged chromosomes during |
anaphase |
Spindle fibers attach to kinetochores during |
prometaphase |
Events of anaphase |
centromeres come apart, and sister chromatids become full-fledged chromosomes, which migrate to opposite poles of the cell |
Events of prophase include |
the condensation of chromatin and the dispersal of nucleoli |
Events of metaphase |
chromosomes align along the metaphase plate |
Events of prometaphase |
attachment of spindle fibers to kinetochores |
Events of telophase |
both nuclear envelope and nucleoli re-form |
During prophase a homologous pair of chromosomes consists of |
two chromosomes and four chromatids |
During BLANK both the contents of the nucleus and the cytoplasm are divided |
the mitotic phase |
During BLANK the cell grows and replicates both its organelles and its chromosomes |
interphase |
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain? |
92 |
Why is it difficult to observe individual chromosomes with a light microscope during interphase? |
They have uncoiled to form long, thin strands |
Which of the following is true of kinetochores? |
They are sites at which microtubules attach to chromosomes |
During prophase, the microtubules of the mitotic spindle BLANK |
lengthen |
During anaphase, the nonkinetochore microtubules BLANK and move past each other, and the kinetochore microtubules BLANK |
lengthen; shorten |
During telophase, the nonkinetochore microtubules BLANK |
disassemble |
If a eukaryotic cell is in the G1 phase of the cell cycle, which statement about the cell's chromosomes must be correct? |
Each chromosomes is made of a complex of DNA and associated proteins |
Which statement provides the best description of the interphase portion of the cell cycle? |
During interphase, a cell is metabolically alive |
What is true of all cancers? |
They have escaped normal cell cycle controls |
If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis? |
10 |
The beginning of anaphase is indicated by which of the following? |
Cohesion is cleaved enzymatically |
Which of the following is NOT true concerning cancer cells? |
When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they exhibit density-dependent inhibition when growing in culture |
Apoptosis |
controlled cell suicide |