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Ch 3 Vocabulary
A&P Chapter 3-cell terms
| Term | Definition |
|---|---|
| Active Transport | form of transport across the cell membrane that requires input of cellular energy |
| Anaphase | third stage of mitosis (and meiosis), during which sister chromatids separate into two new nuclear regions of a dividing cell |
| Anticodon | consecutive sequence of three nucleotides on a tRNA molecule that is complementary to a specific codon on an mRNA molecule |
| Autolysis | breakdown of cells by their own enzymatic action |
| autophagy | lysosomal breakdown of a cell’s own components |
| cell cycle | life cycle of a single cell, from its birth until its division into two new daughter cells |
| cell membrane | membrane surrounding all animal cells, composed of a lipid bilayer interspersed with various molecules; also known as plasma membrane |
| centriole | small, self-replicating organelle that provides the origin for microtubule growth and moves DNA during cell division |
| centromere | region of attachment for two sister chromatids |
| centrosome | cellular structure that organizes microtubules during cell division |
| channel protein | membrane-spanning protein that has an inner pore which allows the passage of one or more substances |
| checkpoint | progress point in the cell cycle during which certain conditions must be met in order for the cell to proceed to a subsequence phase |
| chromatin | substance consisting of DNA and associated proteins |
| chromosome | condensed version of chromatin |
| cilia | small appendage on certain cells formed by microtubules and modified for movement of materials across the cellular surface |
| cleavage furrow | contractile ring that forms around a cell during cytokinesis that pinches the cell into two halves |
| codon | consecutive sequence of three nucleotides on an mRNA molecule that corresponds to a specific amino acid |
| cytokinesis | final stage in cell division, where the cytoplasm divides to form two separate daughter cells |
| cytoplasm | internal material between the cell membrane and nucleus of a cell, mainly consisting of a water-based fluid called cytosol, within which are all the other organelles and cellular solute and suspended materials |
| cytoskeleton | “skeleton” of a cell; formed by rod-like proteins that support the cell’s shape and provide, among other functions, locomotive abilities |
| cytosol | clear, semi-fluid medium of the cytoplasm, made up mostly of water |
| DNA polymerase | enzyme that functions in adding new nucleotides to a growing strand of DNA during DNA replication |
| DNA replication | process of duplicating a molecule of DNA |
| endoplasmic reticulum (ER) | cellular organelle that consists of interconnected membrane-bound tubules, which may or may not be associated with ribosomes (rough type or smooth type, respectively) |
| exocytosis | export of a substance out of a cell by formation of a membrane-bound vesicle |
| extracellular fluid (ECF) | fluid exterior to cells; includes the interstitial fluid, blood plasma, and fluid found in other reservoirs in the body |
| flagellum | appendage on certain cells formed by microtubules and modified for movement |
| G0 phase | phase of the cell cycle, usually entered from the G1 phase; characterized by long or permanent periods where the cell does not move forward into the DNA synthesis phase |
| G1 phase | first phase of the cell cycle, after a new cell is born |
| G2 phase | third phase of the cell cycle, after the DNA synthesis phase |
| gene | functional length of DNA that provides the genetic information necessary to build a protein |
| gene expression | active interpretation of the information coded in a gene to produce a functional gene product |
| genome | entire complement of an organism’s DNA; found within virtually every cell |
| glycocalyx | coating of sugar molecules that surrounds the cell membrane |
| glycoprotein | protein that has one or more carbohydrates attached |
| Golgi apparatus | cellular organelle formed by a series of flattened, membrane-bound sacs that functions in protein modification, tagging, packaging, and transport |
| helicase | enzyme that functions to separate the two DNA strands of a double helix during DNA replication |
| histone | family of proteins that associate with DNA in the nucleus to form chromatin |
| homologous | describes two copies of the same chromosome (not identical), one inherited from each parent |
| hydrophilic | describes a substance or structure attracted to water |
| hydrophobic | describes a substance or structure repelled by water |
| integral protein | membrane-associated protein that spans the entire width of the lipid bilayer |
| intermediate filament | type of cytoskeletal filament made of keratin, characterized by an intermediate thickness, and playing a role in resisting cellular tension |
| interphase | entire life cycle of a cell, excluding mitosis |
| interstitial fluid (IF) | fluid in the small spaces between cells not contained within blood vessels |
| intracellular fluid (ICF) | fluid in the cytosol of cells |
| kinetochore | region of a centromere where microtubules attach to a pair of sister chromatids |
| lysosome | membrane-bound cellular organelle originating from the Golgi apparatus and containing digestive enzymes |
| messenger RNA (mRNA) | nucleotide molecule that serves as an intermediate in the genetic code between DNA and protein |
| metaphase | second stage of mitosis (and meiosis), characterized by the linear alignment of sister chromatids in the center of the cell |
| metaphase plate | linear alignment of sister chromatids in the center of the cell, which takes place during metaphase |
| microfilament | the thinnest of the cytoskeletal filaments; composed of actin subunits that function in muscle contraction and cellular structural support |
| microtubule | the thickest of the cytoskeletal filaments, composed of tubulin subunits that function in cellular movement and structural support |
| mitochondrion | one of the cellular organelles bound by a double lipid bilayer that function primarily in the production of cellular energy (ATP) |
| mitosis | division of genetic material, during which the cell nucleus breaks down and two new, fully functional, nuclei are formed |
| mitotic phase | phase of the cell cycle in which a cell undergoes mitosis |
| mitotic spindle | network of microtubules, originating from centrioles, that arranges and pulls apart chromosomes during mitosis |
| mutation | change in the nucleotide sequence in a gene within a cell’s DNA |
| nuclear envelope | membrane that surrounds the nucleus; consisting of a double lipid-bilayer |
| nuclear pore | one of the small, protein-lined openings found scattered throughout the nuclear envelope |
| nucleolus | small region of the nucleus that functions in ribosome synthesis |
| nucleosome | unit of chromatin consisting of a DNA strand wrapped around histone proteins |
| nucleus | cell’s central organelle; contains the cell’s DNA |
| organelle | any of several different types of membrane-enclosed specialized structures in the cell that perform specific functions for the cell |
| peripheral protein | membrane-associated protein that does not span the width of the lipid bilayer, but is attached peripherally to integral proteins, membrane lipids, or other components of the membrane |
| peroxisome | membrane-bound organelle that contains enzymes primarily responsible for detoxifying harmful substances |
| phagocytosis | endocytosis of large particles |
| pinocytosis | endocytosis of fluid |
| polypeptide | chain of amino acids linked by peptide bonds |
| promoter | region of DNA that signals transcription to begin at that site within the gene |
| prophase | first stage of mitosis (and meiosis), characterized by breakdown of the nuclear envelope and condensing of the chromatin to form chromosomes |
| receptor | protein molecule that contains a binding site for another specific molecule (called a ligand) |
| ribosomal RNA (rRNA) | RNA that makes up the subunits of a ribosome |
| ribosome | cellular organelle that functions in protein synthesis |
| RNA polymerase | enzyme that unwinds DNA and then adds new nucleotides to a growing strand of RNA for the transcription phase of protein synthesis |
| S phase | stage of the cell cycle during which DNA replication occurs |
| selective permeability | feature of any barrier that allows certain substances to cross but excludes others |
| somatic cell | all cells of the body excluding gamete cells |
| splicing | the process of modifying a pre-mRNA transcript by removing certain, typically non-coding, regions |
| telophase | final stage of mitosis (and meiosis), preceding cytokinesis, characterized by the formation of two new daughter nuclei |
| transcription | process of producing an mRNA molecule that is complementary to a particular gene of DNA |
| transfer RNA (tRNA) | molecules of RNA that serve to bring amino acids to a growing polypeptide strand and properly place them into the sequence |
| translation | process of producing a protein from the nucleotide sequence code of an mRNA transcript |
| triplet | consecutive sequence of three nucleotides on a DNA molecule that, when transcribed into an mRNA codon, corresponds to a particular amino acid |
| vesicle | membrane-bound structure that contains materials within or outside of the cell |
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Btownsley85
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