Biology Chapter 9 Mastering

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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

lengthen; shorten

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

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