A centromere is
1.another name for kinetochore
2.the structure to which microtubules attach
3.a constriction on a chromosome bound to a disk
4.all of the above
A nuclear envelope forms around each set of sister chromatids in
1.anaphase
2.metaphase
3.prophase
4.telophase
At the center of the cell cycle control system is Cdk, a protein that
1.is phosphorylated to become active
2.binds to different cyclins
3.is only active during mitosis
4.manufactures growth factors
At the __________ checkpoint, cell growth is controlled.
1.C
2.G1
3.G2
4.S
At which of the following check point, mitosis is controlled?
1.G1
2.G2
3.M
4.S
Cdks bind with __________ , enabling the Cdks to function as enzymes.
1.MPF
2.cyclins
3.histones
4.p53
Cells which no longer divide (such as certain specialized cells found in the human brain) remain in which phase of the cell cycle?
1.Prophase
2.S phase
3.G0 Phase
4.Gl Phase
DNA replication is controlled at which of the following checkpoint?
1.G1
2.G2
3.M
4.S
During which phase, a cleavage furrow is formed in animal cells?
1.C
2.G1
3.G2
4.M
Each chromosome contains two chromatids by the end of the __________ phase in the life cycle of a human cell.
1.C
2.G2
3.M
4.S
How many chromatids are there in a duplicated chromosome?
1.One
2.Two
3.Three
4.Four
How many chromatids does a diploid body cell contain just prior to cell division?
1.23
2.46
3.62
4.92
In prokaryotes, just before the cell divides, the two daughter genomes are attached side by side to the
1.cell membrane
2.replication origin
3.centromeres
4.equatorial plate
In the cell cycle replication of the genome occurs in the
1.G1Â phase
2.G2Â phase
3.M phase
4.S phase
In which of the following phase preparations for genome separation are made?
1.C
2.G1
3.G2
4.M
In which phase, each chromosome replicates to produce two sister chromatids?
1.Anaphase
2.Interphase
3.Metaphase
4.Prophase
Which of the following from a blood clot stimulates the growth of cells in the healing process?
1.EGF
2.PDGF
3.MPF
4.NGF
Microtubules grow from the poles to kinetochores of each chromatid during
1.prophase
2.metaphase
3.anaphase
4.telophase
Sequences that correctly describes the cell cycle is
1.-> G1-> G2 -> S -> mitosis -> cytokinesis ->
2.-> S -> G2 -> mitosis -> cytokinesis -> G1 ->
3.-> G1 ->S -> G2 -> cytokinesis -> mitosis ->
4.->cytokinesis-> mitosis -> G1 -> S -> G2 ->
The cell cycle is controlled in most cells by
1.time (after a certain length of time the cell divides)
2.a series of checkpoints
3.cell size (when the cell reaches a certain size, it divides)
4.different cells exhibit different control strategies
The centromeres move toward the poles in __________ .
1.anaphase
2.interphase
3.metaphase
4.prophase
The event(s) which does not occur during interphase, is/are
1.Chromatin condenses
2.Protein Synthesis
3.Organelles replication
4.DNA replication
The G0 phase is
1.a permanent state of all body cells
2.the state of most cells in an animal body
3.another name for interphase
4.all of the above
The phase of mitosis which is associated with the formation of the nuclear envelope, is
1.prophase
2.metaphase
3.anaphase
4.telophase
The spindle forms in the
1.G1Â phase
2.G2Â phase
3.M phase
4.S phase
The term homologous chromosomes
1.refers to replications of the same chromosome
2.is another name for sister chromatids
3.must be haploid
4.means a pair of chromosomes of the same kind, such as sex chromosomes
The term, not related to mitosis is
1.gametes
2.chromosomes
3.DNA replication
4.somatic cells
What structure forms as a network of protein cables during cell division?
1.Spindle
2.Aster
3.Kinetochore
4.Chromatid
Which of the following begins when pairs of sister chromatids align in the center of the cell?
1.Anaphase
2.Interphase
3.Metaphase
4.Prophase
Which of the following is not a part of a human chromosome in any phase?
1.Centriole
2.Histone
3.Nucleosome
4.Centromere
Which of the following is the normal cell cycle, primarily regulated at checkpoints?
1.Metaphase in mitosis
2.Anaphase, G1 boundary
3.G1-S boundary
4.S-G2 boundary
Which of the following is the primary growth phase of a cell?
1.G1
2.G2
3.M
4.G0
Which of the following statements about mitosis is incorrect?
1.The daughter nuclei are genetically identical to the parent nucleus
2.Chromosomes separate during anaphase due to the interaction of polar microtubules from opposite poles pushing against each other
3.Chromosomes separate during anaphase when the kinetochore microtubules shorten as they depolymerize
4.Chromosomes move to the metaphase plate using motor proteins, a kind of kinesin, attached to spindle fibers
Which of the following triggers the division of activated T lymphocytes?
1.FGF
2.Interlukin 2
3.PDGF
4.Erythroprotein
Which phase of mitosis is associated with chromosomes aligned at the center of the cell and centromeres divide?
1.anaphase
2.interphase
3.metaphase
4.prophase
Which phase of mitosis is associated with separation of chromatids?
1.Prophase
2.Metaphase
3.Anaphase
4.Telophase