42 results found

Search Results for: replacement

Replacement bone

replacement bone --> endochondral bone A bone that develops in a cartilage environment after the latter is partially or... Read More

Replacement model

Definition noun A theory proposed by Christopher Stringer and Peter Andrews suggesting that the place of origin of modern... Read More

Replacement

replacement 1. The act of replacing. 2. (Science: chemistry) The removal of an edge or an angle by one or more... Read More

Mitochondrion

Mitochondrion Definition What are mitochondria? The term “mitochondrion” comes from the two words of the Greek... Read More

Saline solution

Saline Solution Definition Saline solution is one the most medically-used solution, which contains sodium chloride... Read More

Semilunar valve

The human heart structure consists of heart chambers (2 atria and 2 ventricles) that differ functionally from each other.... Read More

Intercalary meristem

The basic structural framework of plants is composed of different types of tissues. Based upon the capacity to divide, the... Read More

Recent single-origin hypothesis

Definition noun The hypothesis that modern humans came from or evolved from a single origin (i.e. in Africa) and then these... Read More

Silent mutation

A mutation is a change in the nucleotide sequence of a gene or a chromosome. When there is only one nucleotide involved, it... Read More

Ecosystem

Ecosystem Definition An ecosystem is a system consisting of biotic and abiotic components that function together as a unit.... Read More

Voluntary dehydration

voluntary dehydration That physiologic lag or deficit that results when sensations of thirst are not strong enough to bring... Read More

Nucleosome

Nucleosome Definition Every organism is made of deoxyribonucleic acid, also known as DNA. DNA is made up of numerous... Read More

Neutral

neutral 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter;... Read More

Mitochondrial DNA

Mitochondrial DNA Definition noun plural: mitochondrial DNAs The genetic material in the mitochondrion that carries code... Read More

Substitution

substitution 1. The act of putting one thing in the place of another, especially the chemical replacement of one element or... Read More

Sugar-phosphate backbone

Definition noun A structural component of DNA that consists of 5-deoxyribose sugars and phosphate groups involved in... Read More

Hormone

Definition noun, plural: hormones (physiology) Any of the substances produced and secreted by an endocrine gland, and then... Read More

Isotonic

Isotonic Definition What does isotonic mean? The term "isotonic" is used in physiology, anatomy, and physical chemistry.... Read More

Missense mutation

What is a missense mutation? Literally speaking, a mutation that changes the meaning of the encoded gene sequence is the... Read More

Base pair substitution

Definition noun, plural: base pair substitutions A type of mutation involving replacement or substitution of a single... Read More

Deoxyribonucleic acid

Deoxyribonucleic Acid (DNA) Definition A nucleic acid refers to any of the group of complex compounds made up of linear... Read More

Transition

Definition noun, plural: transitions (genetics) A small-scale mutation characterized by the replacement of a purine by... Read More

Genetic diversity

Genetic Diversity Definition Each species is composed of individuals with their own set of genes. A gene is the inheritance... Read More

Polymorphism

Polymorphism Definition The occurrence of two or more different forms or morphs in the population of a species is referred... Read More

Redox reaction

Redox Reaction Definition What are redox reactions? This is a common term in chemistry and biology. In chemistry, a redox... Read More

Transversion

Definition noun, plural: transversions (genetics) A small-scale mutation characterized by the replacement of a purine by... Read More

Diaphoresis

What is Diaphoresis? Diaphoresis is referred to excessive or profuse perspiration or sweating which may be due to... Read More

Cellular respiration

Cellular Respiration Definition The main function of cellular respiration is to break down glucose to form energy. What is... Read More

Deoxyribose

Definition noun (1) An aldopentose (i.e. a monosaccharide with five carbon atoms) derived from the pentose sugar ribose by... Read More

Corticosteroid

Definition noun, plural: corticosteroids A steroid hormone produced by the adrenal cortex, e.g. glucocorticoids and... Read More

Mutagen

Mutagen Definition What is a mutagen? A mutagen is a substance or agent that causes DNA impairment that results in the... Read More

Basic

Basic 1. (Science: chemistry) Relating to a base; performing the office of a base in a salt. Having the base in excess, or... Read More

Cell differentiation

Cells are often described as the building blocks of life as they are the smallest unit used to build up organisms. Cells can... Read More

Transition mutation

transition mutation A point mutation involving substitution of one base-pair for another, i.e., replacement of one purine... Read More

Sos repair

SOS repair A system that repairs severely damaged bases in dNA by base excision and replacement, even if there is no... Read More

Terminal hair

Definition noun The mature type of hair characterized by being pigmented, thicker, and with a larger diameter than the... Read More

Frameshift mutation

Define Frameshift Mutation What is a frameshift mutation? In biology, insertions or deletions of nucleotides in the coding... Read More

Mutation

Mutation is a permanent, heritable change in the nucleotide sequence or the process by which such a change occurs in a gene... Read More

Pyruvate

Pyruvate Definition Pyruvates have been often recognized as one of the most important molecules that are frequently... Read More

Hydroxylation

Hydroxylation Hydroxylate, to introduce hydroxyl into (a compound or radical) usually by replacement of... Read More