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chapter 5 terms
chapter five biology terms
Term | Definition |
---|---|
cell cylce | pattern of growth, DNA replication, and cell division that occurs in a eukaryotic cell |
mitosis | process by which a cell divides its nucleus and contents |
cytokinesis | process by which the cell cytoplasm divides |
chromosome | long, continuous thread of DNA that consists of numerous genes and regulatory info |
histone | protein that organizes chromosomes and around which DNA wraps |
chromatin | loose combination of DNA and proteins that is present during interphase |
chromatid | one half of a duplicated chromosome |
centromere | region of condensed chromosome that looks pinched; where spindle fibers attach during meiosis and mitosis |
telomere | repeating nucleotide at the ends of DNA molecules that do not form genes and help prevent the loss of genes |
prophase | first phase of mitosis when chromatin condenses, the nuclear envelope breaks down, the nucleus disappears, and the centrosomes and centrioles migrate to opposite sides of the cell |
metaphase | second phase of mitosis when spindle fibers align the chromosomes along the cell equator |
anaphase | third phase of mitosis during which chromatids are separated and pulled to opposite ends of the cell |
telophase | last phase of mitosis when a complete set of identical chromosomes is positioned at each pole of the cell, the nuclear membranes start to form, the chromosomes begin to uncoil |
growth factor | broad groups of proteins that stimulate cell division |
apoptosis | programmed cell death |
cancer | common name for class of diseases characterized by uncontrollable cell division |
benign | having no dangerous effect on health, especially referring to an abnormal growth of cells that are not cancerous |
maligant | cancerous tumor in which cells break away and spread to other parts of the bod, causing harm to the organism's health |
metastasize | to spread by transferring a disease-causing agent from the sight of the disease to other parts of the body |
carcinogen | substance that produces or promotes the development of cancer |
asexual reproduction | process by which offspring are produced from single parent, does not involve joining of gametes |
binary fission | asexual reproduction in which a cell divides into two equal parts |
tissue | group of cells that work together to perform a similar function |
organ | group of different types of tissues that work together to perform a specific function or related function |
organ system | two or more organs that work in a coordinated way to carry out similar functions |
cell differentation | processes by which unspecialized cells develop into their mature form and function |
stem cell | cell that can divide for long periods of time while remaining undifferentiated |