Transcript Chapter 2 The Cell in Action

2.3 Section Review
1. In your own words, write a definition for each
of the following terms: cell cycle and cytokinesis.
The cell cycle is the process where a cell
grows, copies itself and divides into two
new cells.
 Cytokinesis is the part of the cell cycle
where the cell divides into two new cells.

2.3 Section Review
2. Eukaryotic cells...
A. Do not divide.
 B. Undergo binary fission.
 C. Undergo mitosis.
 D. Have cell walls.

2.3 Section Review
3. Why is it important for chromosomes to be
copied before cell division?

If chromosomes weren’t copied then the
new cells would not be a copy of the
original parent cell.
2.3 Section Review
4. How are binary fission and mitosis similar?
How do they differ?
Both binary fission and mitosis are how
new cells are made.
 They are different because binary fission
is cell division in prokaryotes (bacteria)
and mitosis occurs in the more complex
eukaryotic cells.

2.3 Section Review
4. Describe mitosis.
During prophase, the nuclear membrane
dissolves and the DNA condenses into
chromosomes.
 During metaphase, the homologous
chromosomes pair up at the middle or
equator of the cell.

2.3 Section Review
4. Describe mitosis.
During anaphase, the sister chromatids
separate and move to separate sides of
the cell.
 During telophase, nuclear membranes
forma around each group of
chromosomes.

2.3 Section Review
5. Math Skills: Cell A takes 6h to complete
mitosis. Cell B takes 8h to complete mitosis.
After 24h, how many more copies of Cell A are
there than Cell B?
Cell A will make 24h/6h = 4 copies in 24h
 Cell B will make 24h/8h = 3 copies in 24h
 This means that there will be one more
copy of Cell A than Cell B in 24h.

2.3 Section Review
6. Predicting Consequences: What would happen
if cytokinesis occurred without mitosis?
Each of the cells created would not be a
copy of the original cell. Each cell would
only have half as much DNA as the
original cell.
 Cells would die.

2.3 Section Review
7. Applying concepts: How does mitosis ensure
that a new cell is just like its parent cell?

The DNA of the parent cell is copied
during mitosis to make sure that each of
the new daughter cells is identical to the
parent cell.
2.3 Section Review
8. Making Comparisons: Compare the process
that animal cells and plant cells use to make new
cells. How are the processes different?

The process that plant cells and animal
cells use to make new cells is nearly
identical. The only difference is that
during cytokinesis, plant cells make a cell
plate that becomes a cell wall. Animal
cells do not do this!