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5.1-5.2
| Question | Answer |
|---|---|
| binary fission | Most prokaryotic cells divide by the process of binary fission. A bacterial cell dividing this way is depicted in |
| cancer | disease that occurs when the cell cycle is no longer regulated. |
| cell cycle | repeating series of events that include growth, DNA synthesis, and cell division. |
| cell division | process in which one cell, called the parent cell, divides to form new cells, referred to as daughter cells. |
| cytokinesis | final stage of cell division in eukaryotes and prokaryotes.during cytoki;[;lnesis, the cytoplasm splits in two and cell divides |
| DNA replication | Just before the cell divides, its DNA is copied in a process called DNA replication. This results in two identical chromosomes instead of just one. This step is necessary so that when the cell divides, each daughter cell will have its own chromosome. |
| interphase | cell grows,performs routine life processes, and prepares to divide |
| mitosis | multi-phase process in which the nucleus of a eukaryotic cell divides. |
| tumor | mass of abnormal cells. |
| anaphase | sister chromatids separate and the centromeres divide, The sister chromatids are pulled apart by the shortening of the spindle fibers. |
| centromere | They are attached to one another at a region called the centromere. |
| chromatid | Because DNA has already replicated, each chromosome actually consists of two identical copies. The two copies are called sister chromatids. |
| chromatin | During other phases of the cell cycle, DNA is not coiled into chromosomes. Instead, it exists as a grainy |
| chromosome | coiled structures made of DNA and proteins. Chromosomes are the form of the genetic material of a cell during cell division. |
| gene | The DNA of a chromosome is encoded with genetic instructions for making proteins. These instructions are organized into units |
| homologous chromosomes | chromosomes in a pair. |
| metaphase | During metaphase, spindle fibers attach to the centromere of each pair of sister chromatids. |
| prophase | First and and longest phase of mitosis. During this phase,chromatin condenses into chromosomes,and the nuclear envelope, or membrane breaks down. |
| telophase | during this phase, the chromosomes begin to uncoil and form chromatin. This prepares the genetic material for directing the metabolic activities of the new cells. The spindle also breaks down, and new nuclear membranes from. |