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Terms in this set (51)
chromosomes become visible during
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
One difference between cancer cells and normal cells is that cancer cells
continue to divide even when they are tightly packed together
Which of the following does not occur during mitosis?
replication of the DNA
Which of the following defines a somatic cell?
all body cells except reproductive cells
Which of the following defines the centrosome?
subcellular region involved in the organization of microtubules
Which of the following defines interphase?
all phases of the cell cycle not including M phase
phase that includes separation of the sister chromatid
the ability to produce oneself
one definition of life
reproduce themselves by cell division
produce 2 genetically identical diploid daighter cells
mediate the growth of an organim from the fertilized egg up to an adult
produces haploid gametes
central to sexual reproduction
important mechanism for maintaining genetic variation in a population
the nuclear membrane is present and chromosomes are relaxed
chromosomes condense. each chromosome possesses 2 chromaitds. the mitotic spindke forms
the nuclear membrane disenetegrates. spindle microtubules attach to chromatids
chromosomes line up on the metaphase plate
sister chromatids seperate and move toward opposite poles.
chromosomes arrive at spindle poles. the nuclear membrane reforms and the chromosomes relax
Which of the following functions is not properly matched with the stage of mitosis where the function occurs?
DNA synthesis- prophase
division of the chromosomes and division of the cell and cytoplasm
G1 and G2 gap phases(checkpoints) and S phase(DNA replication)
complex of DNA and protein
first level of chromatin packing
2nd level of chromatin packing
single DNA molecule; paired with its sister in duplicated chromosome
site on DNA molecule where the 2 sister chromatid tightly attach
From prophase through metaphase of mitosis, each chromosome has _____ DNA molecules, while from anaphase through telophase of mitosis, each chromosome has _____ DNA molecule(s).
formed by the duplication of the centromere
protein complex assembled at the centromere of the chromosome
true or false: spindle microtubules pull chromosomes in
forms a cleavage furrow
cytokinesis in animals
formation of a cell plate
cytokinesis in plants
a structure composed of several proteins that associate with the centromere region of a chromosome and that can bind to spindle microtubules
Which of the following does NOT need to happen during a successful mitotic cell division?
Exchange of DNA between homologous chromosomes must happen before metaphase
what 2 things must occur in order for the cell to divide?
1. duplicate the cell contents
division of the chromosomes
division of the cytoplasm and the cell
make up the M Phase
mitosis and cytokinesis
when cell growth and replication occur
are there enough nutrients available to support cell division?
are there growth factors telling the cell to divide?
restriction point/critical checkpoint
Have the chromosomes been duplicated? Are there any errors in the duplicated DNA?
Have all the chromosomes properly attached to spindle microtubules at metaphase?
leads to cell division signal on
excess cell division that remains defined to a single tumor
cancerous cells invade neighboring tissues
cancerous cells migrate through blood vessels or lymph vessels to other organs and tissues
gene that normally is a switch to turn on cell division (proto-oncogene), becomes always on
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