DNA replication produces two identical DNA molecules, called ________, which separate during mitosis.
After chromosomes condense, the _______ is the region where the identical DNA molecules are most tightly attached to each other.
The ____ ______ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell division.
During interphase, most of the nucleus is filled wit ha complex of DNA and protein in a dispersed form called _____.
In most eukaryotes, division of the nucleus is followed by _______, when the rest of the cell divides.
The _____ are the organizing centers for microtubules involved in separating chromosomes during mitosis.
What main processes occur within prophase?
Tubulins assemble into spindle microtubules and the cohesins join sister chromatids of duplicated chromosome.
What main processes occur within metaphase?
Kinetochores are motionless in relation to poles of cell.
What main processes occur within anaphase?
Cohesins break down and kinetochores move toward poles of cell.
During anaphase, the nonkinetochore microtubules _______ and move past each other, and the kinetochore microtubules _______
What happens during anaphase?
During anaphase centromeres come apart, and sister chromatids become full-fledged chromosomes, which migrate to opposite poles of the cell.
True or false? Mitosis takes place during M phase, which is the longest phase of the cell cycle.
Which term describes two recently replicated DNA strands that are joined together just before cell division?
Which stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?
During which substage of mitosis do sister chromatids break apart and start moving to opposite poles of the cell?
Which of the following is a function of the S phase in the cell cycle?
The synthesis of sister chromatids
For the first several divisions of early frog embryos, cells proceed directly from the M phase to the S phase and back to M without gaps. Which of the following is likely to be true about dividing cells in early frog embryos?
The cells get smaller with each generation
True or false? The M phase is characterized by the replication and division of a cell's chromosomes.
If an organism normally has 34 chromosomes, how many molecules of DNA should there be in the G1 phase of the cell cycle?
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely
A plant cell in the process of cytokinesis
Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of micro-tubules, its effectiveness must be related to
Disruption of mitotic spindle formation
In the cells of some organisms, mitosis occurs without cytoki-nesis. This will result in
cells with more than one nucleus
A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in
Which statement provides the best description of the interphase portion of the cell cycle?
During interphase, a cell is metabolically active