PRACTICE QUIZ - Chapter 12
Terms in this set (48)
The person credited with first recognizing (in the 1860s) that living cells cannot arise spontaneously, but arise only from previously existing cells, is _____.
The function of the cell cycle is to produce daughter cells that _____.
are genetically identical to the parent cell (assuming no mutation has occurred)
Sister chromatids _____.
1) are created when DNA is replicated
2) are attached at the centromere prior to division
3) are separated during mitosis
4) have matching copies of the chromosome's DNA
5) all of the above
all of the above
The complex of DNA and protein that makes up a eukaryotic chromosome is properly called _____.
The region of a chromosome holding the two double strands of replicated DNA together is called _____.
If an intestinal cell in a grasshopper contains 24 chromosomes, a grasshopper sperm cell would contain _____ chromosomes.
The centromere is a region in which _____.
sister chromatids are attached to one another in prophase
How many maternal chromosomes are present in a somatic human cell not engaged in cell division?
A cell entering the cell cycle with 32 chromosomes will produce two daughter cells, each with _____.
"Cytokinesis" refers to _____.
division of the cytoplasm
Chromatids are _____.
identical copies of each other if they are part of the same chromosome
If a cell contains 60 chromatids at the start of mitosis, how many chromosomes will be found in each daughter cell at the completion of the cell cycle?
A biochemist measured the amount of DNA in cells growing in the laboratory and found that the quantity of DNA in the cells doubled _____.
between the G1 and G2 phases
A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA at G1 of the cell cycle in one of the grasshopper daughter cells?
During interphase, the genetic material of a typical eukaryotic cell is _____.
dispersed in the nucleus as long strands of chromatin
DNA replication occurs in _____.
the S phase of interphase in both somatic and reproductive cells
Chromatids form _____.
during the S phase
If a somatic human cell is just about to divide, it has _____ chromatids.
Which one of the following does not occur during mitosis?
replication of chromosomes
During what phase in the cell cycle, would you find the most DNA per cell?
In telophase of mitosis, the mitotic spindle breaks down and the chromatin uncoils. This is essentially the opposite of what happens in _____.
Which of the following phases of mitosis is essentially the opposite of prometaphase in terms of the nuclear envelope?
Assume that you are dealing with a species in which the number of chromosomes in each somatic cell is 14. How many sister chromatids are present in the early telophase of mitosis?
At which point in the cell cycle do centrosomes begin to move apart to two poles of the cell in a dividing human skin cell?
The phase of mitosis during which the chromosomes move toward separate poles of the cell is _____.
One event occurring during prophase is _____.
the beginning of the formation of a spindle apparatus
During anaphase of mitosis _____.
1) the centromeres divide
2) the centrioles are at opposite poles
3) a spindle made of microtubules is present
4) identical chromatids move to opposite poles
5) all of the above
all of the above
Which one of the following represents a mismatch or incorrect description?
1) prophase: chromosomes become more tightly coiled
2) metaphase: chromosomes line up on the equatorial plane
3) metaphase: the nuclear envelope disappears
4) anaphase: there is movement of the chromosomes to the poles
5) telophase: chromosomes become more extended
metaphase: the nuclear envelope disappears
Sister chromatids separate during _____.
In animal cell mitosis, the cleavage furrow forms during _____.
At which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?
You would know a dividing cell was a plant cell rather than an animal cell if you saw that _____.
it had formed a cell plate
Which one of the following processes does not occur in dividing bacteria?
During binary fission in a bacterium _____.
the origins of replication move apart
Binary fission in bacterial cells involves _____.
distribution of a copy of the single parental chromosome to each daughter cell
When a cell in S phase is fused with a cell in G1, _____.
DNA synthesis begins immediately in the original G1 nucleus
Tissue culture experiments with PDGF demonstrate that without this substance _____.
fibroblasts fail to divide
You would be unlikely to see which of the following human cells dividing?
Observations of cancer cells in culture support the hypothesis that cancer cells _____.
do not exhibit density-dependent inhibition
What is the difference between a benign tumor and a malignant tumor?
Cells of benign tumors do not metastasize; those of malignant tumors do.
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 plant cell in the process of cytokinesis.
Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of micro-tubules, its effectiveness must be related to
disruption of mitotic spindle formation.
One difference between cancer cells and normal cells is that cancer cells
continue to divide even when they are tightly packed together.
The decline of MPF activity at the end of mitosis is due to
the degradation of cyclin.
In the cells of some organisms, mitosis occurs without cytoki-nesis. This will result in
cells with more than one nucleus.
Which of the following does not occur during mitosis?
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
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?
cleavage furrow formation and cytokinesis
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