Search Results for: arises
Nervous System
THE is the most complicated and highly organized of the various systems which make up the human body. It is the... Read More
Asexual reproduction
Asexual Reproduction Definition What is asexual reproduction? Asexual reproduction is a type of reproduction that does not... Read More
Abiogenesis
Definition noun plural: abiogeneses a·bi·o·gen·e·sis, eɪbaɪəʊˈdʒɛnəsɪs (1) The idea that primitive life... Read More
Biogenesis
Biogenesis Definition Biogenesis refers to the idea or the process whereby a living thing comes from another living thing,... Read More
Fluctuation test
Fluctuation test (Science: investigation) test devised by Luria and Delbruck to determine whether genetic variation in a... Read More
Trypomastigote
Definition noun, plural: trypomastigotes (protistology) The developmental stage or the morphological form in the lifecycle... Read More
Spontaneous generation
Definition noun plural: spontaneous generations The previously popular notion that living organisms arise or develop from... Read More
Turgor pressure
In biology, turgor pressure pertains to the pressure that is exerted by the fluid (e.g. water) against the cell wall. It is... Read More
Density dependent factor
Density-dependent factors are the limiting factors of an ecosystem that regulate population growth in a density-dependent... Read More
Polygenic trait
Polygenic Trait Definition Polygenic trait refers to a trait that is controlled by multiple non-allelic genes. These genes... Read More
Cell theory
What Is Cell Theory? Biological cell theory explains the idea of organismal constitution, structure, and function. It... Read More
Disruptive Selection
An evolutionary process known as disruptive selection (or disruptive natural selection) causes a population to become... Read More
Spermiogenesis
Spermiogenesis Definition Spermiogenesis is the stage of spermatogenesis wherein the spermatids differentiate into mature... Read More
Gametophytic apomixis
Definition noun A form of apomixis where the embryo arises from an unfertilized egg within a diploid embryo sac formed... Read More
Density dependent limiting factor
What Is A Density-Dependent Limiting Factor? Density-dependent limiting factors are limiting factors, which, depending on... Read More
Genetic variation
Definition noun, plural: genetic variations Variations of genomes between members of species, or between groups of species... Read More
Phospholipid
What is a phospholipid? Phospholipids are a subgroup of lipids. Other major types of lipids are fatty acids, sphingolipids,... Read More
Mitochondrion
Mitochondrion Definition What are mitochondria? The term “mitochondrion” comes from the two words of the Greek... Read More
Antecubital fossa
Antecubital Fossa Definition The antecubital fossa or the cubital fossa is the triangular-shaped hollow depression between... Read More
Primary oocyte
Definition noun, plural: primary oocytes The oocyte that arises from the oogonium via the process of oocytogenesis, and... Read More
Adventitious embryony
Definition noun A form of apomixis where a nucellar embryo arises from the diploid nucellus tissue surrounding the embryo... Read More
Adaptive evolution
Definition noun A kind of evolution that involves evolutionary changes that are adaptive to a particular... Read More
“Mutualism factor” could explain why body does not attack normal flora
When sadness reeks in and you feel as if you are all by yourself, think again. That is because you are never alone. As a... Read More
How cell fixes DNA damage
DNA repair strategies DNA is crucial to life. It carries the fundamental blueprint for the proper functioning of a cell.... Read More
The Evolution of Cell Organelles
The previous tutorial page noted the emergence of protists, organisms that possessed a distinct cell nucleus and contained... Read More
Body fluid
Body Fluids Definition What is body fluid? Literally, body fluid is the fluid of the body. The adult human body is ~50-60%... Read More
Red blood cell
Definition noun, plural: red blood cells The blood cell containing hemoglobin and functions primarily to transport... Read More
Neutral theory of molecular evolution
Definition noun A theory stating that evolutionary changes particularly at the molecular level arise from genetic drift of... Read More
Anhidrosis
Definition noun, plural: anhidroses A pathological condition characterized by the inability to sweat... Read More
Nucellar embryony
Definition noun A form of apomixis where a nucellar embryo arises from the diploid nucellus tissue surrounding the embryo... Read More
Superior pharyngeal constrictor
Definition noun (anatomy) The quadrilateral muscle in the pharynx, located superior to other pharyngeal constrictor muscles,... Read More
Thyropharyngeus
Definition noun (anatomy) The superior muscle arising from the thyroid cartilage, and, together with cricopharyngeus,... Read More
Homoplasty
Definition noun, plural: (1) (evolution) The acquisition of a similar form or structure between species of different... Read More
Non-sustainability
Non-Sustainability Definition Non-sustainability is the state in which human consumption or activities exceed the ability... Read More
Osteoblast
Definition noun, plural: osteoblasts A type of bone cell that arises from fibroblasts, and upon maturity, becomes associated... Read More