After the centromeres separate during mitosis, the chromatids move toward opposite poles of the spindle and after cytokinesis be
come _____________. a. centrosomes
b. kinetochores
c. half spindles
d. daughter chromatids
e. daughter chromosomes
The microtubules of the mitotic spindle attach to a specialized structure in the centromere region of each chromosome called the:
a. kinetochore.
b. nucleosome.
c. equatorial plate.
d. nucleotide.
e. centrosome.
A cell entering mitosis with 48 chromosomes will produce two cells, each with:
a. 24 chromosomes.
b. 48 chromosomes.
c. 12 pairs of chromosomes.
d. 36 pairs of chromosomes.
e. 6 pairs of chromosomes.
When the centromeres divide and chromosomes begin to migrate, the mitotic stage is called:
a. Interphase.
b. Telophase.
c. Metaphase.
d. Anaphase.
e. Profase.
Which of the following is true of daughter cells of meiosis I, but not true of daughter cells of mitosis?
a. Chromosomes have previously migrated to opposite poles.
b. DNA from the original cell has been equally divided.
c. Homologous chromosomes have been separated.
d. The cytoplasm of the original cell has divided.
e. All of the above are true of both processes.
Which of the above does NOT normally happen to homologs during meiosis?
Some gene exchange occurs.
Eventually, the homologs end up in different cells.
The separation of one pair of homologs is independent.
The genes controlling some functions will be absent from some gametes.
There will be no purely paternal and maternal chromosomes in the gametes formed.
After cytoplasmic division the result of meiosis II is:
a. Two diploid cells
b. Four diploid cells
c. Two haploid cells
d. Four haploid cells
e. Four diploid cells and four haploid cells
Regulation of the cell cycle is dependent upon cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
a. cdk1 and cyclin B.
b. cyclin D and p21.
c. cyclin A and Cdk2.
d. phosphorylation of RB by Cdk4 and Cdk2
e. external signals from growth factors.
New gene combinations are created during the process of
mitosis.
spermatogenesis.
fertilization.
asexual reproduction.
both b and c are correct.
A human cell containing 22 autosomes and one Y chromosome is a
a. somatic cell of a male b. zygote c. somatic cell of a female
<span>Regulation of the cell cycle is dependent upon cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
This is nuclear fusion that happens in the core of stars. This is the process of converting hydrogens into helium. It is also converting mass into energy as the starting mass is higher than the finishing one, that missing mass is released as energy.
