OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 2: The Cell
Chapter 10: Cell Reproduction
Visual Connection Questions
1. Rb and other proteins that negatively regulate the cell cycle are sometimes called tumor
suppressors. Why do you think the name tumor suppressor might be appropriate for these
proteins?
Rb and other negative regulatory proteins control cell division and therefore prevent the
formation of tumors. Mutations that prevent these proteins from carrying out their function
can result in cancer.
2. Human papillomavirus can cause cervical cancer. The virus encodes E6, a protein that binds
p53. Based on this fact and what you know about p53, what effect do you think E6 binding has
on p53 activity?
, OpenStax Biology 2e Instructor Answer Guide
d. E6 binding marks p53 for degradation.
Review Questions
3. A diploid cell has_______ the number of chromosomes as a haploid cell.
c. twice
4. An organism’s traits are determined by the specific combination of inherited _____.
b. genes.
5. The first level of DNA organization in a eukaryotic cell is maintained by which molecule?
d. histone
6. Identical copies of chromatin held together by cohesin at the centromere are called _____.
d. sister chromatids
7. Chromosomes are duplicated during what stage of the cell cycle?
b. S phase
8. Which of the following events does not occur during some stages of interphase?
d. separation of sister chromatids
9. The mitotic spindles arise from which cell structure?
b. centrosome
10. Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which
stage of mitosis?
b. prometaphase
11. Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic
of which stage of mitosis?
d. telophase
12. Separation of the sister chromatids is a characteristic of which stage of mitosis?
c. anaphase
13. The chromosomes become visible under a light microscope during which stage of mitosis?
a. prophase
14. The fusing of Golgi vesicles at the metaphase plate of dividing plant cells forms what
structure?
a. cell plate
Biology 2e
Unit 2: The Cell
Chapter 10: Cell Reproduction
Visual Connection Questions
1. Rb and other proteins that negatively regulate the cell cycle are sometimes called tumor
suppressors. Why do you think the name tumor suppressor might be appropriate for these
proteins?
Rb and other negative regulatory proteins control cell division and therefore prevent the
formation of tumors. Mutations that prevent these proteins from carrying out their function
can result in cancer.
2. Human papillomavirus can cause cervical cancer. The virus encodes E6, a protein that binds
p53. Based on this fact and what you know about p53, what effect do you think E6 binding has
on p53 activity?
, OpenStax Biology 2e Instructor Answer Guide
d. E6 binding marks p53 for degradation.
Review Questions
3. A diploid cell has_______ the number of chromosomes as a haploid cell.
c. twice
4. An organism’s traits are determined by the specific combination of inherited _____.
b. genes.
5. The first level of DNA organization in a eukaryotic cell is maintained by which molecule?
d. histone
6. Identical copies of chromatin held together by cohesin at the centromere are called _____.
d. sister chromatids
7. Chromosomes are duplicated during what stage of the cell cycle?
b. S phase
8. Which of the following events does not occur during some stages of interphase?
d. separation of sister chromatids
9. The mitotic spindles arise from which cell structure?
b. centrosome
10. Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which
stage of mitosis?
b. prometaphase
11. Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic
of which stage of mitosis?
d. telophase
12. Separation of the sister chromatids is a characteristic of which stage of mitosis?
c. anaphase
13. The chromosomes become visible under a light microscope during which stage of mitosis?
a. prophase
14. The fusing of Golgi vesicles at the metaphase plate of dividing plant cells forms what
structure?
a. cell plate
