What is the correct chromosomal condition for one daughter nucleus at
telophase of mitosis?
A) A
B) B
C) C
D) D
E) E
E
What is the correct chromosomal condition for one daughter nucleus at
telophase of mitosis?
A) A
B) B
C) C
D) D
E) E
E
If the cell whose nuclear material is shown in Figure 9.2 continues
toward completion of mitosis, which of the following events would
occur next?
A) cell membrane synthesis
B) spindle fiber
formation
C) nuclear envelope breakdown
D) formation of
telophase nuclei
E) synthesis of chromatids
formation of telophase nuclei
Of the following, the best conclusion concerning the difference
between the S phases for beta
and gamma is that
A) gamma
contains more DNA than beta.
B) beta and gamma contain the same
amount of DNA.
C) beta cells reproduce asexually.
D) gamma
contains 48 times more DNA and RNA than beta.
E) beta is a plant
cell and gamma is an animal cell.
gamma contains more DNA than beta.
The best conclusion concerning delta is that the cells
A)
contain no DNA.
B) contain no RNA.
C) contain only one
chromosome that is very short.
D) are actually in the G0
phase.
E) divide in the G1 phase.
are actually in the G0 phase.
These protists are intermediate in what sense?
A) They reproduce
by binary fission in their early stages of development and by mitosis
when
they are mature.
B) They never coil up their
chromosomes when they are dividing.
C) They use mitotic division
but only have circular chromosomes.
D) They maintain a nuclear
envelope during division.
E) None of them form spindles.
They maintain a nuclear envelope during division.
What is the most probable hypothesis about these intermediate forms
of cell division?
A) They represent a form of cell reproduction
that must have evolved completely separately from
those of other
organisms.
B) They demonstrate that these species are not closely
related to any of the other protists and
may well be a different
kingdom.
C) They rely on totally different proteins for the
processes they undergo.
D) They may be more closely related to
plant forms that also have unusual mitosis.
E) They show some but
not all of the evolutionary steps toward complete mitosis.
They show some but not all of the evolutionary steps toward complete mitosis.
Which of the following questions might be answered by such a
method?
A) How many cells are produced by the culture per
hour?
B) What is the length of the S phase of the cell
cycle?
C) When is the S chromosome synthesized?
D) How many
picograms of DNA are made per cell cycle?
E) When do spindle
fibers attach to chromosomes?
What is the length of the S phase of the cell cycle?
The research team used the setup to study the incorporation of
labeled nucleotides into a
culture of lymphocytes and found that
the lymphocytes incorporated the labeled nucleotide at
a
significantly higher level after a pathogen was introduced into
the culture. They concluded that
A) the presence of the pathogen
made the experiment too contaminated to trust the results.
B)
their tissue culture methods needed to be relearned.
C) infection
causes lymphocytes to divide more rapidly.
D) infection causes
cell cultures in general to reproduce more rapidly.
E) infection
causes lymphocyte cultures to skip some parts of the cell cycle.
infection causes lymphocytes to divide more rapidly.
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) an animal cell in the
process of cytokinesis.
B) a plant cell in the process of
cytokinesis.
C) an animal cell in the S phase of the cell
cycle.
D) a bacterial cell dividing.
E) a plant cell in metaphase.
a plant cell in the process of cytokinesis.
In the cells of some organisms, mitosis occurs without cytokinesis.
This will result in
A) cells with more than one nucleus.
B)
cells that are unusually small.
C) cells lacking nuclei.
D)
destruction of chromosomes.
E) cell cycles lacking an S phase.
cells with more than one nucleus.
Which of the following does not occur during mitosis?
A)
condensation of the chromosomes
B) replication of the DNA
C)
separation of sister chromatids
D) spindle formation
E)
separation of the spindle poles
replication of the DNA
A particular cell has half as much DNA as some other cells in a
mitotically active tissue. The
cell in question is most likely
in
A) G1.
B) G2.
C) prophase.
D)
metaphase.
E) anaphase.
G1
The drug cytochalasin B blocks the function of actin. Which of the
following aspects of the
animal cell cycle would be most
disrupted by cytochalasin B?
A) spindle formation
B) spindle
attachment to kinetochores
C) DNA synthesis
D) cell
elongation during anaphase
E) cleavage furrow formation and cytokinesis
cleavage furrow formation and cytokinesis