University:
Sam Houston State University
Course:
BIOL 1406 | General Biology I
Academic year:

2022
Views:

142

Pages:

2
Author:

Clint W.

Quiz: The Cell Cycle Agricultural Biology 1. 2. 3. 4. 5. 6. 7. 8. 9. The stage of the cell cycle in which a cell’s DNA is copied is called the _________ phase. a. S b. G1 c. G2 d. Mitosis When the cell cycle is not controlled, _________ may result. a. Down syndrome b. Binary fission c. Cancer d. Spindle As a result of mitosis, each resulting cell a. Receives an exact copy of all of the chromosomes present in the original cell. b. Receives most of the chromosomes from the original cell. c. Donates a chromosome to the original cell d. Receives exactly half the chromosomes from the original cell. During the metaphase stage of mitosis, a. The cell membrane folds inward. b. Chromosomes line up at the cell’s equator c. Spindle fibers shorten, pulling chromosomes to the pole of the cell d. Chromosomes are at opposite ends of the cell The process in which the cytoplasm of a cell is divided is called a. Disjunction b. Interphase c. Binary fission d. Cytokinesis Summarize how normal cells can become cancer cells. Normal cells can become cancer cells if a gene that codes for a protein that regulates cell growth and division is mutated. The mutation may cause uncontrolled cell growth or cancer. During which phase of the cell cycle does the cytoplasm divide? Cytokinesis During which phase(s) of the cell cycle would you expect to find rapidly growing cells? G1 Describe what occurs during the S phase of the cell cycle? DNA replicates The Cell Cycle Interphase. The cell is engaged in metabolic activity and performing its duty as part of a tissue. The DNA duplicates during interphase to prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. Prophase. Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nuclear membrane dissolves and the chromosomes begin moving. Metaphase. Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome. Anaphase. The paired chromosomes separate and move to opposite sides of the cell. Motion results from a combination movement along the spindle microtubules and through the physical interaction of polar microtubules. Telophase. New membranes form around the daughter nuclei while the chromosomes disperse and are no longer visible under the light microscope. Cytokinesis or the partitioning of the cell may also begin during this stage.