bio chap 8
Which of the following occurs during interphase?
cell growth and duplication of the chromosomes
A benign and a malignant tumor differ in that _____.
cells of a benign tumor remain within the tumor, whereas cells of a malignant tumor can spread to other body tissues
At the end of the mitotic (M) phase, the cytoplasm divides in a process called _________________.
cytokinesis
The process by which the cytoplasm of a eukaryotic cell divides to produce two cells is called
cytokinesis.
Independent orientation of chromosomes at metaphase I results in an increase in the number of
possible combinations of characteristics.
The term binary fission is best applied to _____.
prokaryotes
Crossing over occurs during _____.
prophase I
Synapsis occurs during _____.
prophase I
The phase of mitosis during which the mitotic spindle begins to form is
prophase.
Prior to mitosis and after S phase, each chromosome of a eukaryotic cell consists of a pair of identical structures called
sister chromatids.
At the start of mitotic anaphase,
the centromeres of each chromosome come apart.
Looking into your microscope, you spot an unusual cell. Instead of the typical rounded cell shape, the cell has a very narrow middle separating two bulging ends. It sort of looks like the number 8! You realize that this cell is
undergoing cytokinesis.
Which of the following statements regarding the differences between mitosis and meiosis is false?
Crossing over is a phenomenon that creates genetic diversity during mitosis.
The first step of bacterial replication is _____.
DNA replication
The chromosomes line up in the center of the cell during which phase of mitosis?
Metaphase
Which of the following statements regarding mitosis and meiosis is false?
Mitosis produces daughter cells with half the number of chromosomes as the parent cell.
The centrosomes move away from each other and the nuclear envelope breaks up during which phase of mitosis?
Prophase
Which of the following is a key difference between meiosis and mitosis?
Synapsis occurs.
The chromosomes arrive at the poles and nuclear envelopes form during which phase of mitosis?
Telophase
Which of the following statements regarding the cell cycle control system is false?
The cell cycle control system operates independently of the growth factors.
What must happen before a cell can begin mitosis?
The chromosomes must be duplicated.
With the exception of identical twins, siblings who have the same two biological parents are likely to look similar, but not identical, to each other because they have
a similar but not identical combination of genes.
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.
After fertilization, the resulting zygote begins to divide by __________.
mitosis
Bacteria divide by:
binary fission
Both mitosis and meiosis are preceded by
interphase.
Sister chromatids are
joined together at a centromere.
What is different concerning the DNA in bacterial cells as opposed to eukaryotic cells?
all of the above are differences between prokaryotic and eukaryotic DNA
Crossing over is important because it __________.
allows the exchange of different versions of genes between homologous chromosomes
Eukaryotic chromosomes differ from prokaryotic chromosomes in that they
are housed in a membrane-enclosed nucleus.
Which of the following is a feature of plant cell division that distinguishes it from animal cell division?
formation of a cell plate
The function of meiosis is to make __________.
four cells with a haploid number of chromosomes
In anaphase I, __________.
homologous chromosomes move toward opposite poles
Eukaryotic cells spend most of their cell cycle in which phase?
interphase
