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Chapter 41: Answers Explained
Choices A and C are related to meiosis and the production of gametes.
The question asks for the statement that is only a characteristic of the disease, but Choice D is something that occurs in both.
The amount of DNA is decreasing, not doubling, as it does in the S phase.
There is no increase in the number of genes in G 1 and G 2.
Although stage III shows no change in the amount of DNA, interphase includes the S phase of cell division, where the amount of DNA doubles.
Maturation promoting factor (MPF) is a complex of genes that cause a cell to die.
Choice A isn't the most relevant scientific question because it doesn't relate to the cell cycle.
Microtubules, not microfilaments, make up spindle fibers, so choice B is not the most relevant scientific question.
This would have been a relevant scientific question if the question had used the term microtubules.
ribosomes don't have anything to do with the cell cycle, so choice C isn't the most relevant scientific question.
Condensed chromosomes pair up and homologous chromosomes exchange.
During meiosis, there is an event that shuffles genes.
Under a light microscope, chromosomes are invisible.
There is a phase of interphase called the S phase.
The haploid number is not contained in the cell.
Interphase should be the largest slice of the pie chart.
It doesn't matter that G 1, S, and G 2 aren't labeled as part of interphase in choice C. Interphase is shown as a small slice of the pie by Choices A and D.
The M phase occurs after G 2.
There is a significant feature of meiotic cell division.
Each daughter cell will contain half the number after meiosis I.
Plant cells don't have centrioles.
Normal cells grow in culture.
Cancer cells don't show this characteristic.
Cancer cells do not stop dividing.
synapsis is the process when chromosomes pair up.
They prepare for crossing-over, not the other way around.
Cells in the gut are not arrested.
Cells that have been damaged during digestion are replaced every day.
The cell's passage from G 2 into the M phase is triggered by MPF.
Normal cells don't divide because they spend most of their time and energy in interphase.
Interphase consists of G 1, S and G 2 so Choice B is incorrect.
Cancer cells can travel throughout the body, which is why Choice D is incorrect.
I or II could be the other choices.
The cells have half the number of chromosomes.
Before the crossing-over event, each homologue had two identical sister chromatids.
The A, d, and G genes must have been in the sister chromatid.
There are a, D, and g genes in both sister chromatids.
The left side's inner chromatid becomes A, d, and g.
A cell will divide if it passes G 1.
The cell will stop dividing if it does not pass this point.
Cancer cells have one nucleus, which is less than the number of chromosomes.
Cancer cells are not taken into custody.
They duplicate their genes and divide them.
Human cells don't undergo meiosis, so there are choices A, B, and C. Gametes are only produced by the emiotic cell division.
This is what happens in human muscle cells.
The cells are multinucleated and large.
Microtubules are what connect chromosomes from the metaphase plate to centrioles.
Microfilaments are not involved in DNA synthesis.
Microfilaments are not required for the condensing of chromosomes.
There are no microtubules in the center of the configuration.
The progression of those phases of the cell cycle is controlled by the presence of molecules in the cytoplasm.
The researchers' hypothesis that the cell in the S phase goes backward into G 1 is not confirmed by Choice B.
It doesn't make sense that Choice C shows both cells changing into the other's phase.
Choice D doesn't confirm the researchers' hypothesis because it doesn't show any change from the original sketch.
A cell in G 1 would move into S and G 2.
The end of the chromosomes is shorter than the beginning.
The attachment site for the spindle fiber is on the kinetochore.
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