Cell Cycle and Mitosis
What is a chromatid?
A replicated chromosome
Chromatin is considered
Histones and DNA
Which of the following patterns is shown by the data?
In mutant 3 cells, more time is spent in prophase/prometaphase than in the later stages of mitosis
All of the following occur during prophase of mitosis in animal cells?
The centrioles more toward opposite poles the nucleolus can no longer be seen the nuclear envelope disappears the spindle is organized
Which of the following statements about genes is incorrect?
Under normal circumstances, each chromosome contains precisely one gene
What is the expected percent change in the DNA content of a typical eukaryotic cell as it progresses through the cell cycle from he start of the G1 phase to the G2 phase?
+100%
Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?
1 >> 2 >> 4 >> 8 >> 16 >> 32 32
If there are 20 centromeres in a cell at anaphase, how man chromosomes are there in each daughter cell following cytokinesis?
10
If there are 20 chromatids in a cell, how many centromeres are there?
10
If there ate 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cells following cytokinesis?
10
If a cell has 8 chromosomes at metaphase of mitosis, how many chromosome will it have during anaphase?
16
A group of researchers cultured yeast cells in a nutrient-rich environment and a nutrient-poor and observed the duration of the stages of their cell cycles. The results of their study are summarized in Table 1 The cell cycle of yeast cells gown in the nutrient-poor environment is approximately what percent of the cell cycle of yeast cells gown in the nutrient-rich environment?
168
A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes?
46
Based on Figure 1, what percent of the time is required to compete interphase?
95%
Which of the following presents a correct interpretation of the changes in chromosome number depicted in Figure 1?
Chromosomes enter metaphase containing two chromatids attached by a centromere. During anaphase, the chromatids are separated, each becoming a chromosome. Cytokinesis distributes the chromosome into two separate cells.
The longest part of the cell cycle is:
Interphase
How do the daughter cells at the end of mitosis and cytokinesis compadre with their parent cell when it was in G1 of the cell cycle?
The daughter cells have the same number of chromosomes and the same amount of DNA
Regarding mitosis and cytokinesis, one difference between higher plants and animals is that palnts
a cell plate begins to form at telophase, whereas animals a cleavage furrow in initiated at that stage
The formation fo a cell plate is beginning across the middle of a cell and nuclei are re-forming at opposite ends of the cell. What kind of cell is this?
a plant a cell undergoing cytokinesis
What is a chromatid?
a replicated chromosome
Centromeres uncouples, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell
anaphase
Which of the following organisms does not reproduce cells by mitosis and cytokinesis?
bacterium
Where do the microtubules of the spindle originate during mitosis in both plant and animal cells
centriole
What is the name for the special region on a duplicated chromosome that holds the sister chromatids together?
centromere
A centromere is a region in which
chromatids are attached to one another
The centromere is a region in which
chromatids are attached to one another
All of the following occur during prophase of mitosis in animal cells except?
chromosomes are duplicated - interphase (S)
Which of the following organisms does reproduce cells by mitosis and cytokinesis
cow mushroom cockroach banana tree
How is the S phase of the cell cycle measured?
determining the length of time during which DNA synthesis occurred in the cells
During which phases of mitosis are chromosomes composed of two chromatids?
from G2 of interphase through metaphase
Which of the following are primarily responsible for cytokinesis in plant cells
golgi-derived vesicles
If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis?
metaphase
This is the longest of the mitotic stages
metaphase
The somatic cells derived from a single celled zygote divide by which process?
mitosis
Movement of the chromosomes during anaphase would by most affected by a drug that
prevents shortening of microtubules
Two centrosomes are arranged poles of the cell
prometaphase
Centrioles begin to move apart in animal cells
prophase
Chromosomes first become visible during __________ of mitosis
prophase
DNA Replication can be best described as
semiconservative
All of the following occur during mitosis expect the
synthesis of DNA
Which of the following best describes how the amount of DNA in the cell changes during M phase?
the amount of DNA is halved as the cell divides into two daughter cells
All of the following occur during mitosis
the condensing of chromosomes uncoupling of chromatids at the centromere formation of a spindle disappearance fo the nucleolus
Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubular. Surprisingly, this stops mitosis. Specifically taxol must affect
the fibers fo the mitotic spindle
