Biology Practice Test Ch. 12
Terms in this set (40)
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 mitotic cell cycle is to produce daughter cells that __________.
are genetically identical to the parent cell (assuming no mutation has occurred)
Which of the following is FALSE regarding sister chromatids?
Both of the sister chromatids end up in the same daughter cell after cytokinesis has occurred.
The complex of DNA and protein that makes up a eukaryotic chromosome is properly called __________.
The DNA-protein complex called chromatin is organized into a long, thin fiber.
The region of a chromosome in which the two double strands of replicated DNA are held together is called __________.
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 __________.
none of the above. Cells with 16 chromosomes would be produced by meiosis.
"Cytokinesis" refers to __________.
the division of the cytoplasm
Chromatids are __________. (see
identical copies of each other if they are part of the same duplicated 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
If a human somatic cell is just about to divide, it has __________
Down syndrome is characterized by cells having three copies of chromosome 21. As a cell in an individual with Down syndrome prepares to enter mitosis, how many chromatids would be present?
Which 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?
In a human skin cell that is going through the cell cycle, when do the centrosomes separate?
Following cytokinesis in an animal cell, how many centrioles does each new daughter cell possess?
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
Which event or events occur during anaphase?
All of the listed responses are correct.
Cohesins joining sister chromatids at the centromeres are cleaved during anaphase.
A spindle made of microtubules is present during anaphase.
Genetically identical chromosomes (previously sister chromatids) move to opposite poles during anaphase.
The centrioles are at opposite poles during anaphase.
Which of the following represents a mismatch or incorrect description?
metaphase: the nuclear envelope disappears
During which stage of the cell cycle do sister chromatids separate?
In animal cell mitosis, the cleavage furrow forms during which stage of the cell cycle?
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 that a dividing cell was a plant cell rather than an animal cell if you saw that __________.
it had formed a cell plate
Which of the following processes does NOT occur in dividing bacteria?
During binary fission in a bacterium, __________.
the origins of replication move apart
Which of the following is involved in the binary fission of most bacteria?
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?
Which of the following hypotheses is best supported by observing cancer cells in a culture?(
The 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.
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