How many phases are in the cell cycle as shown in the diagram in Model 1?
Starting at the starred cell, what is the order of the stages of the cell cycle?
1st
2nd
3rd
4th
During which phase does the size of the cell increase?
During which phase does the number of cells increase?
Considering your answer to Questions 3 and 4, identify a way that the growth of an organism can be accomplished through the events of the cell cycle.
Cancer, the uncontrolled growth of cells, often results in a tumor, or mass of abnormal cells. Some cancerous tumors consist of many cells that are much smaller than normal. According to Model 1, what part(s) of the cell cycle is (are) most likely being affected?
In model 1, if the length of the arrow represents time, then for those cancerous cells, what happens to the time that is necessary for the cell cycle? What implication might this have for doctors who are treating cancer patients?
According to model 2, what to the cell cycle phase abbreviations, from model 1, mean?
G1
S
G2
M
Imagine 100 cells were chosen randomly from a tissue sample and examined under a microscope. In which phase of the cell cycle would you expect to find the largest number of cells?
Looking at the third column of Model 2, compare the time spent in mitosis with the time spent in gap1 in human cells and describe any difference.
You need to make sure that number 10 is correct prior to answering this.
Explain your answer to number 10.
Compare the amount of DNA from G1 to S. What happened to the amount of DNA?
Based upon your observation of the amount of DNA in question 12, what key process likely occurs during synthesis?
Read the "Key Process" that takes place during mitosis (M) in model 2. Cyto = cell; kinesis = cutting. Based upon the key process of M and the breakdown of the word cytokinesis in this question, why do you think takes place during cytokinesis?
Other than cytokinesis, what other process takes place during M of the cell cycle (tip - read the name of the phase on model 2)?
Look back at the cell entering G1 and leaving G1 of model 1. Based upon this, what is the key process of G1?
