Science Terminology :: essays research papers

1.Active transfer- The movement of a chemical substance by a gradient of concentration or electrical potential in the direction opposite to normal diffusion, requiring the expenditure of energy active transport across a cell membrane.2.Cell- The smallest geomorphologic unit of an organism that is fitted of independent functioning, consisting of one or more nuclei, cytoplasm, and various organelles, all surround by a tractor trailer permeable cell membrane.3.Cell membrane- The semi permeable membrane that encloses the cytoplasm of a cell.4.Cell guess- a theory in biology that includes one or both of the statements that the cell is the thorough structural and functional unit of living matter and that the organism is be of sovereign cells with its properties being the sum of those of its cells5.Cell wall- a theory in biology that includes one or both of the statements that the cell is the fundamental structural and functional unit of living matter and that the organism is compo sed of autonomous cells with its properties being the sum of those of its cellsChloroplast- A chlorophyll-containing plastid found in algal and discolour plant cells.6. Chromatin- A complex of nucleic acids and proteins, primarily histones, in the cell marrow that stains readily with basic dyes and condenses to form chromosomes during cell division7.Chromosome- A threadlike linear strand of DNA and associated proteins in the nitty-gritty of eukaryotic cells that carries the genes and functions in the transmission of hereditary information. 8.Concentration- The amount of a specified substance in a unit amount of another substance. 9.Cytoplasm- The protoplasm outside the nucleus of a cellCytoskeleton- The internal framework of a cell, composed mostly of actin filaments and microtubules.10.Diffusion- The spontaneous intermingling of the particles of two or more substances as a gist of random thermal motion.DNA- A nucleic acid that carries the genetic information in the cell and i s capable of self-replication and synthesis of RNA. DNA consists of two long chains of nucleotides twisted into a double helix and joined by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine. The range of nucleotides determines individual hereditary characteristics.11.Endocytosis - A process of cellular ingestion by which the plasma membrane folds inward to bring substances into the cell.Endoplasmic reticulum- A membrane internet within the cytoplasm of cells involved in the synthesis, modification, and transport of cellular materials.12.Eukaryote- A single-celled or multicellular organism whose cells contain a hard-hitting membrane-bound nucleus.13.Exocytosis - A process of cellular secretion or excretion in which substances contained in vesicles are discharged from the cell by fusion of the vesicular membrane with the outer cell membrane.