Definition for User contributions

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)

• 20:14, 1 February 2011 (diff | hist) . . (+114)‎ . . N Phoresy ‎ (Created page with "A form of commensalism in which individuals of one species use individuals of a second species for transportation.") (current)
• 20:14, 1 February 2011 (diff | hist) . . (+116)‎ . . N Phosphodiester linkage ‎ (Created page with "Refers to a double linkage (two phosphoester bonds) that holds together adjacent nucleotides in DNA and RNA strands.") (current)
• 20:13, 1 February 2011 (diff | hist) . . (+41)‎ . . N Phosphodiesterase ‎ (Created page with "An enzyme that breaks down cAMP into AMP.") (current)
• 20:13, 1 February 2011 (diff | hist) . . (+212)‎ . . N Phospholipid ‎ (Created page with "A class of lipids that are similar in structure to triglycerides, but the third hydroxyl group of glycerol is linked to a phosphate group instead of a fatty acid. They are a key ...") (current)
• 20:12, 1 February 2011 (diff | hist) . . (+93)‎ . . N Photoautotroph: ‎ (Created page with "An organism that uses the energy from light to make organic molecules from inorganic sources.") (current)
• 20:12, 1 February 2011 (diff | hist) . . (+124)‎ . . N Photoheterotroph ‎ (Created page with "An organism that is able to use light energy to generate ATP, but which must take in organic compounds from the environment.") (current)
• 20:11, 1 February 2011 (diff | hist) . . (+86)‎ . . N Photon ‎ (Created page with "A massless particle travelling in a wavelike pattern and moving at the speed of light.") (current)
• 20:11, 1 February 2011 (diff | hist) . . (+124)‎ . . N Photoperiodism ‎ (Created page with "A plant's ability to measure and respond to night length, and indirectly, day length, as a way of detecting seasonal change.") (current)
• 20:10, 1 February 2011 (diff | hist) . . (+66)‎ . . N Photoreceptor ‎ (Created page with "An electromagnetic receptor that responds to visible light energy.") (current)
• 20:10, 1 February 2011 (diff | hist) . . (+230)‎ . . N Photorespiration ‎ (Created page with "The metabolic process occurring in C3 plants that results when the enzyme rubisco combines with oxygen instead of carbon dioxide and produces only one molecule of PGA instead of ...") (current)
• 20:09, 1 February 2011 (diff | hist) . . (+153)‎ . . N Photosynthesis ‎ (Created page with "The process whereby light energy is captured by plant, algal, or cyanobacterial cells and used to synthesize organic molecules from CO2 and H2O (or H2S).")
• 20:09, 1 February 2011 (diff | hist) . . (+109)‎ . . N Photosystem I (PSI) ‎ (Created page with "One of two distinct complexes of proteins and pigment molecules in the thylakoid membrane that absorbs light.") (current)
• 20:09, 1 February 2011 (diff | hist) . . (+105)‎ . . N Photosystem II (PSII) ‎ (Created page with "The complex of proteins and pigment molecules in the thylakoid membrane that generates oxygen from water.") (current)
• 20:08, 1 February 2011 (diff | hist) . . (+52)‎ . . N Phototropin ‎ (Created page with "The main blue-light sensor involved in phototropism.") (current)
• 20:08, 1 February 2011 (diff | hist) . . (+54)‎ . . N Phototropism ‎ (Created page with "The tendency of a plant to grow toward a light source.") (current)
• 20:08, 1 February 2011 (diff | hist) . . (+30)‎ . . N Phyla ‎ (Created page with "The subdivisions of a kingdom.") (current)
• 20:07, 1 February 2011 (diff | hist) . . (+148)‎ . . N Phyllotaxy ‎ (Created page with "The patterned arrangement of leaves on a plant stem; new stems, leaves, lateral roots, and flowers occur at regular intervals in a specific pattern.") (current)
• 20:07, 1 February 2011 (diff | hist) . . (+97)‎ . . N Phylogenetic species concept ‎ (Created page with "The members of a single species are identified by having a unique combination of characteristics.") (current)
• 20:07, 1 February 2011 (diff | hist) . . (+190)‎ . . N Phylogenetic tree ‎ (Created page with "A diagram that describes a phylogeny; such a tree is a hypothesis of the evolutionary relationships among various species, based on the information available to and gathered by s...") (current)
• 20:06, 1 February 2011 (diff | hist) . . (+58)‎ . . N Phylogeny ‎ (Created page with "The evolutionary history of a species or group of species.") (current)
• 20:06, 1 February 2011 (diff | hist) . . (+71)‎ . . N Physiology ‎ (Created page with "The study of the functions of cells and body parts of living organisms.")
• 20:05, 1 February 2011 (diff | hist) . . (+34)‎ . . N Phytochrome ‎ (Created page with "A red- and far-red-light receptor.")
• 20:05, 1 February 2011 (diff | hist) . . (+159)‎ . . N Phytomer ‎ (Created page with "A modular unit of plant development that consists of four parts: a stem node and an internode, a leaf, and an axillary meristem or bud at the base of the leaf.") (current)
• 20:05, 1 February 2011 (diff | hist) . . (+78)‎ . . N Phytoplankton ‎ (Created page with "Microscopic algae and cyanobacteria that float or actively move through water.") (current)
• 20:04, 1 February 2011 (diff | hist) . . (+201)‎ . . N Phytoremediation ‎ (Created page with "The process of removing harmful metals from soils by growing hyperaccumulator plants on metal-contaminated soils, and then harvesting and burning the plants to ashes for disposal...") (current)
• 20:04, 1 February 2011 (diff | hist) . . (+40)‎ . . N Pigment ‎ (Created page with "A molecule that can absorb light energy.")
• 20:04, 1 February 2011 (diff | hist) . . (+118)‎ . . N Pili (singular: pilus) ‎ (Created page with "Threadlike surface appendages that allow prokaryotes to attach to each other during mating or to move across surfaces.") (current)
• 20:03, 1 February 2011 (diff | hist) . . (+89)‎ . . N Piloting ‎ (Created page with "A mechanism of migration in which an animal moves from one familiar landmark to the next.") (current)
• 20:03, 1 February 2011 (diff | hist) . . (+154)‎ . . N Pinocytosis ‎ (Created page with "A form of endocytosis that involves the formation of membrane vesicles from the plasma membrane as a way for cells to internalize the extracellular fluid.")
• 20:02, 1 February 2011 (diff | hist) . . (+135)‎ . . N Pistil ‎ (Created page with "A flower structure that may consist of a single carpel or multiple, fused carpels, and is differentiated into stigma, style, and ovary.") (current)
• 20:02, 1 February 2011 (diff | hist) . . (+95)‎ . . N Pit ‎ (Created page with "A small cavity in a plant cell wall where secondary wall materials, such as lignin, are absent.") (current)
• 20:02, 1 February 2011 (diff | hist) . . (+25)‎ . . N Pitch ‎ (Created page with "The tone of a sound wave.")
• 20:02, 1 February 2011 (diff | hist) . . (+211)‎ . . N Pituitary dwarfism ‎ (Created page with "A condition in which a person's anterior pituitary gland fails to make adequate amounts of GH during childhood, so the concentrations of GH and IGF-1 in the blood will be lower t...") (current)
• 20:01, 1 February 2011 (diff | hist) . . (+174)‎ . . N Pituitary giant ‎ (Created page with "A person who has a tumour of the GH-secreting cells of the anterior pituitary gland and thus produces excess GH during childhood and adulthood; the person can grow very tall.") (current)
• 20:01, 1 February 2011 (diff | hist) . . (+69)‎ . . N Pituitary gland ‎ (Created page with "A multilobed endocrine gland sitting directly below the hypothalamus.") (current)
• 20:01, 1 February 2011 (diff | hist) . . (+150)‎ . . N Placenta ‎ (Created page with "A structure through which humans and other eutherian mammals retain and nourish their young within the uterus via the transfer of nutrients and gases.") (current)
• 20:00, 1 February 2011 (diff | hist) . . (+100)‎ . . N Placental transfer tissue ‎ (Created page with "In plants, a nutritive tissue that aids in the transfer of nutrients from maternal parent to embryo.") (current)
• 20:00, 1 February 2011 (diff | hist) . . (+32)‎ . . N Plant ‎ (Created page with "A member of the kingdom Plantae.") (current)
• 19:59, 1 February 2011 (diff | hist) . . (+104)‎ . . N Plant tissue culture ‎ (Created page with "A laboratory process to produce thousands of identical plants having the same desirable characteristics.") (current)
• 19:59, 1 February 2011 (diff | hist) . . (+237)‎ . . N Plantae ‎ (Created page with "A eukaryotic kingdom of the domain Eukarya; includes multicellular organisms that have cellulose-rich cell walls and plastids, and that are adapted in many ways to terrestrial ha...") (current)
• 19:58, 1 February 2011 (diff | hist) . . (+161)‎ . . N Plaque ‎ (Created page with "1. A deposit of lipids, fibrous tissue, and smooth muscle cells that may develop in blood vessels. 2. A bacterial biofilm that may form on the surfaces of teeth.") (current)
• 19:58, 1 February 2011 (diff | hist) . . (+48)‎ . . N Plasma cell ‎ (Created page with "A cell that synthesizes and secretes antibodies.") (current)
• 19:58, 1 February 2011 (diff | hist) . . (+93)‎ . . N Plasma membrane ‎ (Created page with "The biomembrane that separates the internal contents of a cell from its external environment.")
• 19:57, 1 February 2011 (diff | hist) . . (+56)‎ . . N Plasma ‎ (Created page with "The fluid part of blood; part of the extracelluar fluid.") (current)
• 19:56, 1 February 2011 (diff | hist) . . (+116)‎ . . N Plasmid ‎ (Created page with "A small circular piece of DNA found naturally in many strains of bacteria and also occasionally in eukaryotic cells.") (current)
• 19:56, 1 February 2011 (diff | hist) . . (+92)‎ . . N Plasmodesma (plural: plasmodesmata) ‎ (Created page with "A membrane-lined, ER-containing channel that connects the cytoplasm of adjacent plant cells.") (current)
• 19:56, 1 February 2011 (diff | hist) . . (+48)‎ . . N Plasmogamy ‎ (Created page with "The fusion of the cytoplasm between two gametes.") (current)
• 19:55, 1 February 2011 (diff | hist) . . (+169)‎ . . N Plasmolysis ‎ (Created page with "The shrinkage of algal or plant cytoplasm that occurs when water leaves the cell by osmosis, with the result that the plasma membrane no longer presses on the cell wall.") (current)
• 19:55, 1 February 2011 (diff | hist) . . (+217)‎ . . N Plastid ‎ (Created page with "A general name given to organelles found in plant and algal cells, which are bound by two membranes and contain DNA and large amounts of chlorophyll (chloroplasts), carotenoids (...") (current)
• 19:55, 1 February 2011 (diff | hist) . . (+96)‎ . . N Platelets ‎ (Created page with "Cell fragments in the blood of mammals that play a crucial role in the formation of blood clots.") (current)

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)