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Cell Physiology
Cell Structure
24
Physiology
Undergraduate 2
01/24/2009

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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.
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