Download Chapter 10 Homework Answers (p. 257) 1. D 2. C 3. B 4. C 5. C 6. A

Chapter 10 Homework Answers (p. 257)
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During cell division, a cell divides into two daughter cells
When a cell is small, the information stored in the DNA is able to meet all of the cell’s needs. If a
cell were to grow without limit an information crisis would occur.
Cell volume is the amount of material inside the cell. Surface area is the total area of the cell’s
membrane. Surface-area-to-volume ratio is the surface area divided by the volume.
A cell’s surface-area-to-volume ratio decreases as a cell grows larger. This means the area
available for diffusion decreases as well. Thus, if a cell grows too large, it would be unable to
take in all needed materials and expel all its wastes. These problems impose limits on the
growth of a cell.
Well before cell division, each chromosome is duplicated. At the beginning of cell division, each
chromosome consists of two identical sister chromatids.
Together, interphase and cell division make up the cell cycle.
During interphase, a cell increases in size, synthesizes new proteins and organelles, duplicates its
chromosomes, and prepares for cell division by producing needed organelles and molecules.
The genetic information that is passed on from one generation of cells to the next is carried by
chromosomes, which are made up of DNA. Before cell division, chromosomes are duplicated, so
that each chromosome consists of two identical sister chromatids. Each pair of chromatids are
attached at an area called the centromere.
Prophase—chromatin condenses into chromosomes, centrioles migrate to opposite ends of the
cell, spindle fibers begin to form, nuclear envelope disappears.
Metaphase—chromosomes line up in the middle of the cell (@ the metaphase plate), spindle
fibers are attached to the chromosomes at the centromere.
Anaphase—chromatids move apart or away from one another
Telophase—The cell splits. Nuclear envelope reappears, spindle fibers disappear.
The number of chromosomes is the same (after mitosis).
A cell grows, prepares for division, and divides to form two daughter cells, each of which then
begins the cycle again.
Yes, new cells will replace the removed cells because of the process of cell division, which will
continue until the new cells come in contact with other cells. When that occurs, cell division will
stop.
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23. Cyclins regulate the timing of the cell cycle in eukaryotic cells.
24. The consequence of uncontrolled cell growth are sever, as, for example, in cancer.
25. Cancer cells do not respond to the signals that regulate the growth of most cells. As a result,
they form masses of cells called tumors that can damage the surrounding tissues.
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