103 Review Questions
3. A diploid cell has_______ the number of chromosomes as a haploid cell.
- one-fourth
- half
- twice
- four times
4. An organism’s traits are determined by the specific combination of inherited _____.
- cells.
- genes.
- proteins.
- chromatids.
5. The first level of DNA organization in a eukaryotic cell is maintained by which molecule?
- cohesin
- condensin
- chromatin
- histone
6. Identical copies of chromatin held together by cohesin at the centromere are called _____.
- histones.
- nucleosomes.
- chromatin.
- sister chromatids.
7. Chromosomes are duplicated during what stage of the cell cycle?
- G1 phase
- S phase
- prophase
- prometaphase
8. Which of the following events does not occur during some stages of interphase?
- DNA duplication
- organelle duplication
- increase in cell size
- separation of sister chromatids
9. The mitotic spindles arise from which cell structure?
- centromere
- centrosome
- kinetochore
- cleavage furrow
10. Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which stage of mitosis?
- prophase
- prometaphase
- metaphase
- anaphase
11. Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of which stage of mitosis?
- prometaphase
- metaphase
- anaphase
- telophase
12. Separation of the sister chromatids is a characteristic of which stage of mitosis?
- prometaphase
- metaphase
- anaphase
- telophase
13. The chromosomes become visible under a light microscope during which stage of mitosis?
- prophase
- prometaphase
- metaphase
- anaphase
14. The fusing of Golgi vesicles at the metaphase plate of dividing plant cells forms what structure?
- cell plate
- actin ring
- cleavage furrow
- mitotic spindle
15. Figure 10.6 Which of the following is the correct order of events in mitosis?
- Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus reforms and the cell divides. Cohesin proteins break down and the sister chromatids separate.
- The kinetochore becomes attached to the mitotic spindle. Cohesin proteins break down and the sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus reforms and the cell divides.
- The kinetochore becomes attached to the cohesin proteins. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus reforms and the cell divides.
- The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the cell divides.
16. At which of the cell-cycle checkpoints do external forces have the greatest influence?
- G1 checkpoint
- G2 checkpoint
- M checkpoint
- G0 checkpoint
17. What is the main prerequisite for clearance at the G2 checkpoint?
- cell has reached a sufficient size
- an adequate stockpile of nucleotides
- accurate and