Question

use with textbook pages 153-158.
getting to know the cell cycle
vocabulary
anaphase
mitosis
cell cycle
nucleolus
cytokinesis
nucleus
dna
prophase
duplicated chromosomes
telophase
four
three
interphase
two
metaphase
use the terms in the vocabulary box to fill in the blanks. you can use each term more than once. you will not need to use every term.

1. there are stages in the life of a cell.
2. the stage that makes up most of the cells life is . during this stage, cells grow and carry out their life functions. in cells that will divide, the nucleus makes a copy of its .
3. during , the nucleus of the cell divides into two equal and identical parts. each part has a copy of the dna.
4. during , the two equal, identical parts of the cell separate. this stage forms identical cells with a nucleus and dna.
5. there are phases of mitosis.
6. in , the duplicated chromosomes contract into an x shape and the disappears.
7. in , the line up across the middle of the cell.
8. in , the move apart to opposite ends of the cell.
9. in , a forms around the chromosomes at the opposite ends of the dividing cell.

70 mhr • section 5.1 the cell cycle and mitosis © 2007 mcgraw-hill ryerson limited

Explanation:

1. The cell cycle has three main stages (interphase, mitosis, cytokinesis), so we use "three" from the vocabulary.
2. Interphase is the longest stage of the cell's life, where the cell grows and the nucleus copies its DNA. So we use "interphase" and "DNA".
3. Mitosis is the stage where the nucleus divides into two equal and identical parts, each with a copy of DNA.
4. Cytokinesis is when the two parts of the cell separate, forming two identical cells.
5. Mitosis has four phases (prophase, metaphase, anaphase, telophase).
6. In prophase, duplicated chromosomes contract into an X - shape and the nucleolus disappears.
7. In metaphase, the duplicated chromosomes line up across the middle of the cell.
8. In anaphase, the duplicated chromosomes (sister chromatids) move apart to opposite ends of the cell.
9. In telophase, a nucleus forms around the chromosomes at the opposite ends of the dividing cell.

Answer:

1. three
2. interphase; DNA
3. mitosis
4. cytokinesis; two
5. four
6. prophase; nucleolus
7. metaphase; duplicated chromosomes
8. anaphase; duplicated chromosomes
9. telophase; nucleus