Definition for User contributions
From Biology Forums Dictionary
For Duddy (talk | block log | uploads | logs)
(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)
- 19:44, 27 January 2011 (diff | hist) . . (+179) . . N Septum (plural: septa) (Created page with "A cross-wall; examples include the cross-walls that divide the hyphae of most fungi into many small cells, and the structure that separates the old and new chambers of a nautilus.") (current)
- 19:43, 27 January 2011 (diff | hist) . . (+67) . . N Sere (Created page with "Each phase of succession in a community; also called a seral stage.") (current)
- 19:43, 27 January 2011 (diff | hist) . . (+30) . . N Set point (Created page with "The normal value of a variable") (current)
- 19:43, 27 January 2011 (diff | hist) . . (+58) . . N Setae (Created page with "Chitinous bristles in the integument of many invertebrates") (current)
- 19:42, 27 January 2011 (diff | hist) . . (+74) . . N Sex chromosomes (Created page with "A distinctive pair of chromosomes that are different in males and females.") (current)
- 19:42, 27 January 2011 (diff | hist) . . (+74) . . N Sex linked (Created page with "Refers to genes that are found on one sex chromosome but not on the other.") (current)
- 19:41, 27 January 2011 (diff | hist) . . (+82) . . N Sex pili (Created page with "Hairlike structures made by bacterial F1 cells that bind specifically to F2 cells.") (current)
- 19:41, 27 January 2011 (diff | hist) . . (+84) . . N Sex-influenced inheritance (Created page with "The phenomenon in which an allele is dominant in one sex but recessive in the other.") (current)
- 19:41, 27 January 2011 (diff | hist) . . (+106) . . N Sexual reproduction (Created page with "A process that requires a fertilization event in which two gametes unite to create a cell called a zygote.") (current)
- 19:40, 27 January 2011 (diff | hist) . . (+193) . . N Sexual selection (Created page with "A type of natural selection that is directed at certain traits of sexually reproducing species that make it more likely for individuals to find or choose a mate and engage in suc...") (current)
- 19:40, 27 January 2011 (diff | hist) . . (+71) . . N Shannon diversity index (HS) (Created page with "A means of measuring the diversity of a community; HS = − Σpi ln pi.") (current)
- 19:40, 27 January 2011 (diff | hist) . . (+84) . . N Shared derived character (Created page with "A trait that is shared by a group of organisms but not by a distant common ancestor.") (current)
- 19:39, 27 January 2011 (diff | hist) . . (+39) . . N Shared primitive character (Created page with "A trait shared with a distant ancestor.") (current)
- 19:39, 27 January 2011 (diff | hist) . . (+77) . . N Shattering (Created page with "The process by which ears of wild grain crops break apart and disperse seeds.") (current)
- 19:39, 27 January 2011 (diff | hist) . . (+98) . . N Shell (Created page with "A tough, protective covering that is impermeable to water and prevents the embryo from drying out.") (current)
- 19:38, 27 January 2011 (diff | hist) . . (+90) . . N Shivering thermogenesis (Created page with "Rapid muscle contractions in an animal, without any locomotion, to raise body temperature.") (current)
- 19:37, 27 January 2011 (diff | hist) . . (+137) . . N Shoot meristem (Created page with "The tissue that produces all aerial parts of the plant, which include the stem as well as lateral structures, such as leaves and flowers.") (current)
- 19:37, 27 January 2011 (diff | hist) . . (+124) . . N Short tandem repeat sequences (STRs) (Created page with "Sequences found in multiple sites in the genome of humans and other species that vary in length among different individuals.") (current)
- 19:37, 27 January 2011 (diff | hist) . . (+154) . . N Short-day plant (Created page with "A plant that flowers only when the nights are longer than a defined period. Such night length occurs in late summer, fall, and winter, when days are short") (current)
- 19:36, 27 January 2011 (diff | hist) . . (+95) . . N Shotgun DNA sequencing (Created page with "A strategy for sequencing an entire genome by randomly sequencing many different DNA fragments.") (current)
- 19:36, 27 January 2011 (diff | hist) . . (+242) . . N Sickle-cell anemia (Created page with "A disease caused by a genetic mutation in a hemoglobin gene in which sickle-shaped red blood cells are less able to move smoothly through capillaries and can block blood flow, re...")
- 19:35, 27 January 2011 (diff | hist) . . (+50) . . N Sieve plate pore (Created page with "One of many perforations in a plant's sieve plate.") (current)
- 19:35, 27 January 2011 (diff | hist) . . (+55) . . N Sieve plate (Created page with "The perforated end wall of a mature sieve-tube element.") (current)
- 19:34, 27 January 2011 (diff | hist) . . (+120) . . N Sieve-tube elements (Created page with "A component of the phloem tissues of flowering plants; these structures are arranged end to end to form transport pipes.") (current)
- 19:33, 27 January 2011 (diff | hist) . . (+60) . . N Sign stimulus (Created page with "A factor that initiates a fixed-action pattern of behaviour.") (current)
- 19:32, 27 January 2011 (diff | hist) . . (+52) . . N Signal (Created page with "An agent that can influence the properties of cells.") (current)
- 19:32, 27 January 2011 (diff | hist) . . (+190) . . N Signal recognition particle (SRP) (Created page with "A protein–RNA complex that recognizes the ER signal sequence and pauses translation; SRP then binds to a receptor in the ER membrane, which docks the ribosome over a translocat...") (current)
- 19:31, 27 January 2011 (diff | hist) . . (+89) . . N Signal transduction pathway (Created page with "A group of proteins that convert an initial signal to a different signal inside the cell.") (current)
- 19:31, 27 January 2011 (diff | hist) . . (+149) . . N Signal transduction (Created page with "The process in which a cell perceives a physical or chemical signal, thereby switching on an intercellular pathway that leads to a cellular response.") (current)
- 19:31, 27 January 2011 (diff | hist) . . (+97) . . N Silencer (Created page with "A response element that prevents transcription of a given gene when its expression is not needed.") (current)
- 19:30, 27 January 2011 (diff | hist) . . (+128) . . N Silent mutation (Created page with "A gene mutation that does not alter the amino acid sequence of the polypeptide, even though the nucleotide sequence has changed.") (current)
- 19:30, 27 January 2011 (diff | hist) . . (+142) . . N Simple Mendelian inheritance (Created page with "The inheritance pattern of traits affected by a single gene that is found in two variants, one of which is completely dominant over the other.") (current)
- 19:30, 27 January 2011 (diff | hist) . . (+68) . . N Simple translocation (Created page with "A single piece of chromosome that is attached to another chromosome.") (current)
- 19:29, 27 January 2011 (diff | hist) . . (+72) . . N Single-factor cross (Created page with "A cross in which an experimenter follows the variants of only one trait.") (current)
- 19:29, 27 January 2011 (diff | hist) . . (+116) . . N Single-strand binding protein (Created page with "A protein that binds to both of the single strands of parental DNA and prevents them from re-forming a double helix.")
- 19:28, 27 January 2011 (diff | hist) . . (+88) . . N Sister chromatids (Created page with "The two duplicated chromatids that are still joined to each other after DNA replication.")
- 19:27, 27 January 2011 (diff | hist) . . (+105) . . N Skeletal muscle (Created page with "A type of muscle tissue that is attached to bones in vertebrates and to the exoskeleton of invertebrates.") (current)
- 19:27, 27 January 2011 (diff | hist) . . (+105) . . N Skeleton (Created page with "A structure or structures that serve one or more functions related to support, protection, and locomotion") (current)
- 19:26, 27 January 2011 (diff | hist) . . (+67) . . N Sliding filament mechanism (Created page with "The way in which a muscle fibre shortens during muscle contraction.") (current)
- 19:26, 27 January 2011 (diff | hist) . . (+176) . . N SLOSS debate (Created page with "In conservation biology, the debate over whether it is preferable to protect one single, large reserve or several smaller ones (SLOSS stands for single large or several small).") (current)
- 19:25, 27 January 2011 (diff | hist) . . (+81) . . N Slow block to polyspermy (Created page with "Events that produce barriers to more sperm penetrating an already fertilized egg.") (current)
- 19:25, 27 January 2011 (diff | hist) . . (+65) . . N Slow fibre (Created page with "A skeletal muscle fibre with a low rate of myosin ATP hydrolysis.") (current)
- 19:24, 27 January 2011 (diff | hist) . . (+156) . . N Slow-oxidative fibre (Created page with "A skeletal muscle fibre that has a low rate of myosin ATP hydrolysis but has the ability to make large amounts of ATP; used for prolonged, regular activity.") (current)
- 19:24, 27 January 2011 (diff | hist) . . (+174) . . N Small effector molecule (Created page with "With regard to transcription, refers to a molecule that exerts its effects by binding to a regulatory transcription factor and causing a conformational change in the protein.") (current)
- 19:23, 27 January 2011 (diff | hist) . . (+142) . . N Small intestine (Created page with "A tube that leads from the stomach to the large intestine where nearly all digestion of food and absorption of food nutrients and water occur.") (current)
- 19:23, 27 January 2011 (diff | hist) . . (+265) . . N Smooth endoplasmic reticulum (smooth ER) (Created page with "The part of the ER that is not studded with ribosomes. This region is continuous with the rough ER and functions in diverse metabolic processes, such as detoxification, carbohydr...") (current)
- 19:22, 27 January 2011 (diff | hist) . . (+159) . . N Smooth muscle (Created page with "A type of muscle tissue that surrounds hollow tubes and cavities inside the body's organs, such that their contraction can propel the contents of those organs.") (current)
- 19:22, 27 January 2011 (diff | hist) . . (+48) . . N Soil horizon (Created page with "Layers of soil, ranging from topsoil to bedrock.") (current)
- 19:21, 27 January 2011 (diff | hist) . . (+34) . . N Solute (Created page with "A substance dissolved in a liquid.")
- 19:21, 27 January 2011 (diff | hist) . . (+66) . . N Solute potential (Created page with "The osmotic potential; an element in the water potential equation.") (current)
(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)