Details Title: Cell Physiology Description: Cell Structure Total Flash Cards: 24 Created: 01/24/2009 15:33:56		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Physiology Flashcards
Cards in this set: Term Microfilaments Definition Made of actin and is labile. React with myosin to generate contractile forces. Involved with movement. Term Intermediate filaments Definition Tough insoluble and stable protein fibers which resist tension in cell. Term Matrix Definition Outer cloude of protein on a Centrosome. Involved in elongation of microtubules and mitotic spindle of microtubules. Term Centrosome Definition Located near nucleus. Consists of a matrix and an inner pair of centrioles. Term Cytoplasmic inclusion Definition Impermanent structures in cytoplasm such as lipid droplets and glycogen. Term Centrioles Definition Core of centrosomes. Composted of nine triplets of microtubule. Organize a microtubule network during mitosis to form the spindle and asters. Also form base of cilia and flagella. Term Nuclear envelope Definition Has pores and is continuous with endoplasmic reticulum. Term Nucleolus Definition Dark staining body. Cell's ribosome producing machine. Term Chromatin Definition Granular thread-like material in nucleus composed of DNA and histone proteins. Term Transcription Definition Process where genetic code is copied onto mRNA Term Nucleotides consist of Definition Sugar, phosphate and one of four bases Term Histones Definition Regulate gene expression and transcription. DNA helix wraps around these proteins. Term Nucleosome Definition Cluster of DNA aad histones Term Mitotic phase Definition Prophase -> Metaphase -> Telophase -> Cytokinesis. Term G1 (gap 1) Definition Part of Interphase. Centrioles start to replicate Term G2 (gap 2) Definition Enzymes needed for cell division are synthesized, centrioles finish replication and cell gets ready to divide. Term Asters (stars) Definition Microtubule arrays extending from the centrosomes. During prophase. Term Kinetochores Definition Part of mitotic spindles which attach to chromosomes. Others are call polar spindles. Term Separase Definition An enzyme which cleaves cohesin, start to seperates the chromatids. Part of Metaphase. Term Crossing over Definition Large segments of DNA are exchanged. Part of Meiosis I Term Synapsis Definition Paring of 46 homologous duplicated chromosomes in Meiosis I Term Benign neoplasm Definition Local mass, remains compacted, often encapsulated, grows slowly and seldom kills host. Term Malignant Neoplasm Definition A mass which is not-capsulated and grows rapidly. Cells are immature and metastasis (invades other tissue) by means of lymphatics and/or blood. Term Oncogenes Definition Result of mutations of certain regulator genes called protooncogenes, which normally stimulate or inhibit cell proliferation and development.