Download MITOSIS HW

MITOSIS HW
BIO H
DR WEINER
Multiple choice ( 3 pts)
1. Chromatids are held together by a(n)
a. centriole
c. centromere
2. Each chromosome strand is called a(n)
a. centriole
c. centromere
b. spindle
d. aster
b. chromatid
d. aster
3. A cell has 12 chromosomes. How many chromosomes will each daughter cell have?
a. 12
b. 24
c. 6
d. 4
4. The phase of mitosis that is characterized by the lining up of chromosomes in the center
of the cells is called
a. anaphase
b. telophase
c. prophase
d. metaphase
5. Which of the following is NOT a phase of mitosis?
a. Anaphase
b. Metaphase
c. Telophase
d. Interphase
e. Prophase
6. Which of the following phases of mitosis is essentially the opposite of prophase in terms
of nuclear changes?
a. Telophase
b. S phase
c. Metaphase
d. Interphase
e. Anaphase
7. The difference between a cell in the G1 and G2 phases of the cell cycle is that
a.
the cell contains more DNA in G2 than in G1.
b.
by G2, the spindle has begun to form.
c.
chromosomes are visible in G1.
d.
mitosis follows G1.
e.
the S phase comes after G2.
8. The amount of DNA in the nucleus of a cell is doubled during ____________________.
a.
interphase.
b.
prophase.
c.
metaphase.
d.
anaphase.
e.
telophase.
9. How does cytokinesis differ in animal cells and plant cells?
a.
In animal cells, cytokinesis occurs in telophase; in plant cells, cytokinesis occurs
in interphase.
b.
In animal cells, the plasma membrane pinches inward; in plant cells, a disk of cell
wall material grows outward.
c.
In animals, the result is two diploid cells; in plants, two haploid cells result.
d.
Cytokinesis completes cell division in animals but not in plants.
e.
all of the above
True/False (3 pts)
1. As a cell increases in size, its volume increases at a faster rate than its surface area._____
2. As a result of mitosis, a cell having 10 chromosomes will give rise to two cells each that
have 20 chromosomes _____.
3. DNA replication occurs during prophase _____.
4. Anaphase is the first phase of mitosis _____.
5. During prophase, the centrioles separate from each other and take up positions on the
opposite poles of the cell _____.
6. During cytokinesis in animal cells, a plate forms midway between the two nuclei _____.
Short Answer ( 10 pts)
1. Explain why cells are so small.
2. Compare and contrast chromatin and chromosomes.
3. Why is it important that DNA is copied during the process of cell division?
4. Cell division by mitosis results in the production of 2 identical daughter cells and
involves 3 stages: interphase, mitosis, and cytokinesis
a. Discuss what is going on in all 3 stages. Be sure to include each part of mitosis
b. There are 3 main events that must occur in order for a cell to successfully divide
and produce 2 new daughter cells. What are they and in what stage of the cell
cycle do they occur?
5. A cell is 4 m long, 4 m high, and 4 m wide. SHOW ALL WORK TO RECEIVE
CREDIT
a. What is its surface area?
b. What is its volume?
c. What is the surface area –to-volume ratio?