A diploid cell has_______ the number of
chromosomes as a haploid cell.
a. one-fourth
b. half
c. twice
d. four times
c. twice
An organism's traits are determined by the specific
combination of inherited _____.
a. cells.
b. genes.
c. proteins.
d. chromatids.
b. genes.
The first level of DNA organization in a eukaryotic
cell is maintained by which molecule?
a. cohesin
b. condensin
c. chromatin
d. histone
d. histone
Identical copies of chromatin held together by
cohesin at the centromere are called _____.
a. histones.
b. nucleosomes.
c. chromatin.
d. sister chromatids.
d. sister chromatids.
Chromosomes are duplicated during what stage of
the cell cycle?
a. G1 phase
b. S phase
c. prophase
d. prometaphase
b. S phase
Which of the following events does not occur
during some stages of interphase?
a. DNA duplication
b. organelle duplication
c. increase in cell size
d. separation of sister chromatids
d. separation of sister chromatids
The mitotic spindles arise from which cell
structure?
a. centromere
b. centrosome
c. kinetochore
d. cleavage furrow
b. centrosome
Attachment of the mitotic spindle fibers to the
kinetochores is a characteristic of which stage of
mitosis?
a. prophase
b. prometaphase
c. metaphase
d. anaphase
b. prometaphase
Unpacking of chromosomes and the formation of
a new nuclear envelope is a characteristic of which
stage of mitosis?
a. prometaphase
b. metaphase
c. anaphase
d. telophase
d. telophase
Separation of the sister chromatids is a
characteristic of which stage of mitosis?
a. prometaphase
b. metaphase
c. anaphase
d. telophase
c. anaphase
The chromosomes become visible under a light
microscope during which stage of mitosis?
a. prophase
b. prometaphase
c. metaphase
d. anaphase
a. prophase
The fusing of Golgi vesicles at the metaphase
plate of dividing plant cells forms what structure?
a. cell plate
b. actin ring
c. cleavage furrow
d. mitotic spindle
a. cell plate
At which of the cell-cycle checkpoints do external
forces have the greatest influence?
a. G1 checkpoint
b. G2 checkpoint
c. M checkpoint
d. G0 checkpoint
a. G1 checkpoint
What is the main prerequisite for clearance at the
G2 checkpoint?
a. cell has reached a sufficient size
b. an adequate stockpile of nucleotides
c. accurate and complete DNA replication
d. proper attachment of mitotic spindle fibers to
kinetochores
c. accurate and complete DNA replication
If the M checkpoint is not cleared, what stage of
mitosis will be blocked?
a. prophase
b. prometaphase
c. metaphase
d. anaphase
d. anaphase