Mastering Bio for Cell Division
At the end of the mitotic (M) phase, the cytoplasm divides in a process called _________________.
cytokinesis
Spindle fibers attach to kinetochores during _____.
prometaphase
Chromosomes become visible during _____.
prophase
Cytokinesis often, but not always, accompanies _____.
telophase
During which phase of mitosis does the nuclear envelope re-form?
telophase
During mitosis, the chromosomes move because _____.
they attach to a dynamic, precisely regulated mitotic spindle
During prophase a homologous pair of chromosomes consists of _____.
two chromosomes and four chromatids
Which of the following statements correctly describes the timing of DNA synthesis?
DNA is synthesized in the S phase of interphase.
The first step of bacterial replication is _____.
DNA replication
True or false. Mitosis takes place during M phase of the cell cycle, which is longer than interphase.
False
The chromosomes line up in the center of the cell during which phase of mitosis?
Metaphase
The centrosomes move away from each other and the nuclear envelope breaks up during which phase of mitosis?
Prophase
The chromosomes arrive at the poles and nuclear envelopes form during which phase of mitosis?
Telophase
What must happen before a cell can begin mitosis?
The chromosomes must be duplicated.
What would be the immediate consequence of destroying a cell's centrosomes?
The mitotic spindle would not form.
Within one chromosome, what is the relationship between the sequence of bases in DNA of one sister chromatid compared to the other?
The sequences are identical.
A certain species of animal has six pairs of chromosomes. How many DNA molecules are present in the nuclei of these animals during G2 phase?
24
Nucleoli are present during _____.
interphase
Which of the following checkpoints does not occur late in G1?
A check that chromosome replication has been successfully completed
The sister chromatids separate and begin moving toward opposite poles of the cell during which phase of mitosis?
Anaphase
Which of the following statements regarding cell division is false?
Cell division is common in eukaryotes but rare in prokaryotes.
What is different concerning the DNA in bacterial cells as opposed to eukaryotic cells?
-the amount of DNA present - whether the DNA is housed in a nucleus or not - whether the DNA is linear or circular
A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes.
16
Normal human gametes carry _____ chromosomes.
23
Centromeres divide and sister chromosomes become full-fledged chromosomes during _____.
anaphase
Strictly speaking, the phrase "like begets like" refers to
asexual reproduction only.
Which of the following is a feature of plant cell division that distinguishes it from animal cell division?
formation of a cell plate
Bacteria divide by:
binary fission
Gametes are produced by _____.
meiosis
During which phase of mitosis do the chromosomes line up on a plane equidistant from the two spindle poles?
metaphase
Consider the process by which bacterial populations grow. What process performs a similar function in humans?
mitosis
