Nucleoli are present during
Cytokinesis often, but not always, accompanies
Chromosomes become visible during
Centromeres divide and sister chromatids become full-fledged chromosomes during
Spindle fibers attach to kinetochores during
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
A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?
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
During anaphase, the nonkinetochore microtubules BLANK and move past each other, and the kinetochore microtubules BLANK
During telophase, the nonkinetochore microtubules BLANK
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?
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
controlled cell suicide