ch 9 &10
Which of the steps take place in both mitosis and meiosis?
3
Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?
32
From the description above, which of the following is the order that most logically illustrates a sequence of meiosis?
5,2,4,3,1
One daughter nucleus at the end of telophase II of Meiosis
A
Which of the following is an example of alteration of generations?
A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte)
At prophase of mitosis
B
Independent assortment of chromosomes is a result of
the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I
Chiasmata are what we see under a microscope that let us know which of the following has occurred
Crossing over
What is a genome?
The complete complement of an organism's genes
Which of the following are primarily responsible for cytokinesis in animal cells but not in plant cells?
actin or microfilaments
This is the shortest part of the cell cycle:
anaphase
Which term describes centromeres uncoupling, sister chromatids separating, and the two new chromosomes moving to opposite poles of the cell?
anaphase
The best conclusion concerning delta is that the cells
are actually in the G0 phase
Bacterial cells divide by which process?
binary fission
Which of the following does not occur during mitosis?
replication of the DNA
Chromosomes first become visible during which phase of mitosis?
prophase
If cells in the process of dividing are subjected to colchicine, a drug the interferes with the functioning of the spindle apparatus, at which stage will mitosis be arrested?
prophase
Which is the longest of the mitotic stages?
prophase
Which term describes centrioles beginning to move apart in animal cells?
prophase
At the M phase checkpoint, the complex allows for what to occur?
Kinetochores are able to bind to spindle microtubules
Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?
MPF
For species with haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?
About 8 million
Density-dependent inhibition is explained by which of the following?
As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing
Which of these statements is false?
At sexual maturity, ovaries and testes produce diploid gametes by meiosis
How does the sexual life cycle increase the genetic variation in a species?
By allowing independent assortment of chromosomes
One daughter nucleus at telophase of mitosis
E
What is the correct chromosomal condition for one daughter nucleus at telophase of mitosis?
E
Which of the following is true of a species that has a chromosome number of 2n=16?
Each cell had eight homologous pairs
Verve and muscle cells are in this phase
G0
The somatic cells of a privet shrub each contain 46 chromosomes. To be as different as they are from human cells, which have the same number of chromosomes, which of the following must be true?
Genes on a particular privet chromosome, such as the X, must be on a different human chromosome, such as number 18
Which of the following are primarily responsible for cytokinesis in plant cells?
Golgi-derived vesicles
Which of the following happens at the conclusion of meiosis I?
Homologous chromosomes are separated
Synapsis of homologous pain occurs; crossing over may occur
I-Prophase
Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common?
II, III, and IV
Which of the following happen at the conclusion of meiosis I?
II- Metaphase I
Which diagram represents prophase I of meiosis?
IV
Which of the following is released by platelets in the vicinity of an injury?
PDGF
Homologous chromosomes synapse and crossing over occurs
The statement is true for meiosis I only
Independent assortment of chromosomes occurs
The statement is true for meiosis I only
Chromatids are separated from each other
The statement is true for mitosis and meiosis II
Chromatids are separated from each other.
The statement is true for mitosis and meiosis II
Which of the following is true concerning career cells?
They do not exhibit density-dependent inhibition when growing in culture
Centromere of sister chromatids disjoin and chromatids separate.
VII- Anaphase II
Regarding mitosis and cytokinesis, one difference between higher plants and animals is that in plants
a cell plate begins to form at telophase, whereas in animal cells a cleavage furrow is initiated at the stage
What is a chromatid?
a replicate chromosome
Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?
centrosome
The centromere is a region in which
chromatids remain attached to one another until anaphase
Proteins that are involved in the regulation of the cell cycle, and that show fluctuation in concentration during the cell cycle, are called
cyclins
Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that
gamma contains more DNA than beta
The human X and Y chromosomes
include genes that determine an individual's sex
Compared to most prokaryotic cells, eukaryotic cells typically have
more DNA molecules and longer genomes
Which of these is a karyotype?
organized images of a cell's chromosomes
Why does chromatin coil into chromosomes during mitosis?
to allow the chromosomes to move without becoming entangled and breaking
Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mitosis will have
twice as much DNA as the nuclei of gametes produced by meiosis
Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis the result would be a cell with
two nuclei