Chapter 10 Questions

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1. DNA "overlaod" and the ratio of surface area to volume are two reasons why cells divide.

2.The cells DNA is like the books in a library because the replication of DNA copies the genetic information and tranfers it to the two daughter cells that resemble books; the two daughter cells then have their very own information just like books. Therefore the daughter cells have information similiar to a book in a library.

3. Cell division is the solution to the problems caused by cell growth.

4. As a cell increases in size its volume increases more rapidly than its surface area.

5. A cubic cell with a length of 4 cm, would have a surface area of 96cm squared, a volume of 64cm squared, and a ratio of 2:3.

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1. The main events of the cell cycle is prophase, metaphase, anaphase, and telophase.

2. During prophase the nuclear membrane breaks down, the centrioles separates to opposite sides of the cell, a spindle starts to form, and chromatin condenses into chromosomes. During metaphase the chromosomes line up in the center of the cell and the spindle fibers connect to them from the centromere. The sister chromatids separate into individual chromosomes and move apart during anaphase. During the final stage, telophase, the chromosomes at opposite ends of the cell form two new nuclear membranes.

3. During interphase the cell grows and replicates its DNA and centrioles.

4. Chromosomes are made up of DNA and protien.

5. Cell division of eukaryotic and prokaryotic cells are for the most part very alike, expect in prokaryotes, after each daughter cell gets a comlete copy of their own genetic information, the rest of the procces is separating the contents of the cell into two parts.

6. Ckytokinesis in plant and animal cells are similar becuase a cell membrane is used to separate the cytoplasm. They are different because animal cells are pinched into two parts where as plant cells gradually develops into separating parts.

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1. Chemicals that regulate the cell cylce are cyclins as well as internal and external regulators. They regulate the cell cycle by triggering cell division and controlling the timing of the process.

2. When cells do not respond to the signals that normally regulate cancer developes and creates tumors that can damage the surrounding tissues.

3. Cells respond to contact with other cells by not increasing in size.

4. Cancer can be considered a disease of the cell cycle because it causes a loss of control over the cell cylce.

5. If cyclin were injected into a cell that was in mitosis, then there would be less of a chance for something to go wrong and cell division would happen faster because cyclins controll the timing of cell division.

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1. A: volume

2. C:two daughter cells

3. B:centromere

4. B: six

5. C: chromatids

6: A: Prophase

7: B

8: B:cyclins

9. A: speed up or slow down cell cycle

10. A: cancer