Question 1

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. Which of the following statements explains why this occurs?

Accepted Answer

The cells continued to grow as long as there was empty space. When cells come into contact with other cells they would stop growing, or be turned off. Cell division can be inhibited by the proximity of other cells of the same type, a process called contact inhibition.

Question 2

All of the following occur during the latter stages of mitotic prophase except the

Accepted Answer

DNA replication occurs during interphase, not during prophase.

Question 3

Proteins that are involved in the regulation of the cell cycle, and that show fluctuation in concentration during the cell cycle, are called

Accepted Answer

The fluctuation in levels of cyclins is one of the main regulators of the cell cycle.

Question 4

The drug chloral hydrate prevents elongation of microtubules by preventing the addition of new subunits to the growing end. During which stage of mitosis would chloral hydrate be most harmful?

Accepted Answer

During prophase, spindle fibers attach to the centromeres and pull chromosomes to the midline of the cell. If chloral hydrate prevents elongation, then the chromosome would not be able to be relocated to the center of the cell.

Question 5

The figure below shows a cell in which stage of the cell cycle?

Accepted Answer

During interphase, the eukaryotic cell duplicates the contents of the cytoplasm, and DNA replicates in the nucleus. The duplicated chromosomes are not yet visible. A pair of chromosomes is outside the nucleus, and the nuclear envelope has not broken down.

Question 6

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA in the nucleus. Those cells would have ________ picograms at the end of the S phase and ________ picograms at the end of G₂.

Accepted Answer

During the S phase, DNA is doubled. Therefore any stage after the S stage would have twice the amount of DNA information until two new cells are formed, each with the proper amount of DNA.

Question 7

Rebecca found out that she has a mass of dividing cells called a tumor in her ovaries. She has had tests and is returning to the doctor. Which of the following would be the best news that Rebecca could receive from her doctor?

Accepted Answer

During metastasis, a malignant tumor invades neighboring tissues and spreads through the body, while a benign tumor does not invade neighboring tissue.

Question 8

How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G₁ of the cell cycle?

Accepted Answer

The chromosomal information in each daughter cell is identical to the parent cell. The DNA has not yet been copied. It will be doubled in the S phase of interphase.

Question 9

What would occur in a cell if the production of cyclins halted during the cell cycle?

Accepted Answer

Cyclins and kinases control the transition of the cell cycle from G₂ to mitosis.

Question 10

Cancer is a disorder in which some cells have lost the ability to control their

Accepted Answer

Cancer is caused by cells with uncontrollable cell division.

Question 11

The term metastasis refers to the fact that cancer cells tend to

Accepted Answer

Traveling to other body sites from point of production is a characteristic of cancer cells. This traveling seeds other body regions with the rapidly dividing cells, thus spreading cancer.

Question 12

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?

Accepted Answer

The cells continued to grow as long as there was empty space. When cells come into contact with other cells they would stop growing, or be turned off.

Question 13

Some of the drugs used in chemotherapy work by

Accepted Answer

Spindles are used by the cell to pull chromosomes to opposite sides of the cell during the cell cycle. If the function of the spindle has been compromised, the cells will not be able to divide.

Question 14

If there are 20 centromeres in a cell, how many chromosomes are there?

Accepted Answer

There is one centromere for every replicated chromosome that holds two sister chromatids together. In other words, two sister chromatids are considered one replicated chromosome. Once sister chromatids separate, they are each considered to be a full-fledged chromosome, which is now unreplicated.

Question 15

Which of the following is not a characteristic of cancer cells?

Accepted Answer

Cancer is a disease of the cell cycle. When cells have abnormal nuclei, lose contact inhibition, lack differentiation, and have uncontrolled growth, these are all signs of cancerous cells.

Question 16

If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of

Accepted Answer

During anaphase, the duplicated chromosome separates and its chromatids move toward opposite poles of the cell. At this point, each chromatid is now considered a chromosome, since it consists of a complete DNA molecule. If 46 duplicated chromosomes pulled apart in anaphase, there would now be 92 chromosomes present in the cell until telophase and cytokinesis completes the chromosome reduction

Question 17

Apoptosis

Accepted Answer

Apoptosis is the intentional, programmed death of a cell. The control of cell division and apoptosis keeps the number of somatic cells in multicellular organisms in check. Apoptosis can also be used to remove damaged or malfunctioning cells.

Question 18

Cancer occurs when

Accepted Answer

Cancer is a disease of the cell cycle. The regulation of the cell cycle is lost and uncontrolled cell division occurs.

Question 19

Susan went to an oncologist because some cancerous cells had been detected within her breast tissue. Which of the following is not a warning signal for cancer?

Accepted Answer

Cancer cells share some common abnormalities that occur when cell division is not properly regulated. These cells display signs of abnormal cell division, such as multiple nuclei in a single cell.

Question 20

Cytokinesis usually, but not always, follows mitosis. If a cell undergoes mitosis and not cytokinesis, this would result in

Accepted Answer

If a cell goes through mitosis but not cytokinesis, it will have two nuclei within one cell.

Quiz 8: Cellular Reproduction

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. Which of the following statements explains why this occurs?

All of the following occur during the latter stages of mitotic prophase except the

Proteins that are involved in the regulation of the cell cycle, and that show fluctuation in concentration during the cell cycle, are called

The drug chloral hydrate prevents elongation of microtubules by preventing the addition of new subunits to the growing end. During which stage of mitosis would chloral hydrate be most harmful?

The figure below shows a cell in which stage of the cell cycle?

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA in the nucleus. Those cells would have picograms at the end of the S phase and picograms at the end of G₂.

Rebecca found out that she has a mass of dividing cells called a tumor in her ovaries. She has had tests and is returning to the doctor. Which of the following would be the best news that Rebecca could receive from her doctor?

How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G₁ of the cell cycle?

What would occur in a cell if the production of cyclins halted during the cell cycle?

Cancer is a disorder in which some cells have lost the ability to control their

The term metastasis refers to the fact that cancer cells tend to

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?

Some of the drugs used in chemotherapy work by

If there are 20 centromeres in a cell, how many chromosomes are there?

Which of the following is not a characteristic of cancer cells?

If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of

Apoptosis

Cancer occurs when

Susan went to an oncologist because some cancerous cells had been detected within her breast tissue. Which of the following is not a warning signal for cancer?

Cytokinesis usually, but not always, follows mitosis. If a cell undergoes mitosis and not cytokinesis, this would result in

Quiz 8: Cellular Reproduction

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. Which of the following statements explains why this occurs?

All of the following occur during the latter stages of mitotic prophase except the

Proteins that are involved in the regulation of the cell cycle, and that show fluctuation in concentration during the cell cycle, are called

The drug chloral hydrate prevents elongation of microtubules by preventing the addition of new subunits to the growing end. During which stage of mitosis would chloral hydrate be most harmful?

The figure below shows a cell in which stage of the cell cycle?

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA in the nucleus. Those cells would have ________ picograms at the end of the S phase and ________ picograms at the end of G2.

Rebecca found out that she has a mass of dividing cells called a tumor in her ovaries. She has had tests and is returning to the doctor. Which of the following would be the best news that Rebecca could receive from her doctor?

How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G1 of the cell cycle?

What would occur in a cell if the production of cyclins halted during the cell cycle?

Cancer is a disorder in which some cells have lost the ability to control their

The term metastasis refers to the fact that cancer cells tend to

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?

Some of the drugs used in chemotherapy work by

If there are 20 centromeres in a cell, how many chromosomes are there?

Which of the following is not a characteristic of cancer cells?

If a cell has 46 chromosomes at the beginning of mitosis, then at the end of anaphase there would be a total of

Apoptosis

Cancer occurs when

Susan went to an oncologist because some cancerous cells had been detected within her breast tissue. Which of the following is not a warning signal for cancer?

Cytokinesis usually, but not always, follows mitosis. If a cell undergoes mitosis and not cytokinesis, this would result in

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA in the nucleus. Those cells would have picograms at the end of the S phase and picograms at the end of G₂.

How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G₁ of the cell cycle?