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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
Endocytosis
Endocytosis Definition What is endocytosis in biology? Endocytosis is a cellular process by which a cell internalizes any... Read More
Gene Action – Operon Hypothesis
Reviewed by: Mary Anne Clark, Ph.D. Some genes are switched on or off depending on environmental conditions. The... Read More
Metaphloem
Definition noun, plural: metaphloems A component of the primary phloem that develops often following the differentiation of... Read More
Chlorophyta
Chlorophyta is a taxonomic group (a phylum) comprised of green algae that live in marine habitats. Some of them are found in... Read More
Tracheary elements
Definition noun (botany) The principal conductive cells of the xylem associated with the conduction of water and minerals... Read More
Sphenethmoid
Definition noun It designed to both sphenoid and ethmoid regions of the cranium that surrounds the anterior portions of the... Read More
Sessile plant
Definition noun, plural: sessile plants (botany) Any of the flowering plants lacking petioles. Supplement Flowering plants... Read More
Primary phloem
Definition noun The type of phloem derived from the primary meristem during the development of a vascular... 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
Dark respiration
Definition noun (1) A form of respiration in plants where carbon dioxide is released without the aid of (sun)light. (2)... Read More
Mayers reflex
Mayer's reflex --> basal joint reflex opposition and adduction of the thumb with flexion at its metacarpophalangeal joint... Read More
Secondary xylem
Definition noun, plural: secondary xylems The xylem formed as a result of the secondary growth from the vascular... Read More
Hyaline cartilage
Hyaline Cartilage Definition Firstly, let us ask, what is cartilage? Cartilage is a tough and flexible material. It can be... Read More
Complement fixation test
Definition noun (immunology) A form of immunological test for the detection of the presence of either a particular antibody... Read More
Anaerobic respiration
Anaerobic Respiration Definition What is anaerobic respiration? Anaerobic (cellular) respiration is a respiratory process... Read More
Facultative anaerobe
Facultative Anaerobe Definition What does facultative anaerobe mean? Facultative organisms are the most adaptable... Read More
Allopatric speciation
We can define speciation as a process by which the novel genetically independent group of organisms are formed through the... Read More
Fundamental niche
Definition noun The full range of environmental conditions and resources an organism can possibly occupy and use,... Read More
Endomembrane system
Ever wondered how biomolecules are made within the cell and then they are released outside the cell for use by the body?... 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
Thymidine diphosphate
Definition noun plural: thymidine diphosphates (biochemistry) A nucleotide composed of thymine, deoxyribose and two... Read More
Regeneration in humans – Finding the gene switch
Regeneration in humans is much more limited compared in other animals. Say for instance when one lost a limb, much as well... Read More
Physical Development in Humans
The Newly Born Child Depending on the nutrients available to the child within pregnancy and the genetic makeup of the... Read More
Regulation of Organic Metabolism, Growth and Energy Balance
Organic Metabolism Events of Absorptive and Post-absorptive States. The absorptive state is the period during which... Read More
Plant Cells vs. Animal Cells
Plant Cells Most cells are not visible with the naked eye. However, with microscopes of various types, plant cells can be... Read More
Plant cell
Plant Cell Definition A plant cell refers to any cell of a plant. It is the structural and functional unit of plants. Plant... Read More
Uridine monophosphate
Definition noun plural: uridine monophosphates (biochemistry) A nucleotide composed of uracil, ribose and a phosphate... Read More
Thymidine triphosphate
Definition noun plural: thymidine triphosphates (biochemistry) A nucleotide composed of thymine, deoxyribose and three... Read More
Thymidine monophosphate
Definition noun plural: thymidine monophosphates (biochemistry) A nucleotide composed of thymine, deoxyribose and a... Read More
Hypomelanism
Definition noun A condition in which there is a partial lack of the melanin, thus, a reduced... Read More
Nucleobase
Definition noun plural: nucleobases (biochemistry) The base in the nucleic acid, e.g. purines and pyrimidines Details ... Read More
Patellar reflex
Definition noun, plural: patellar reflexes A stretch reflex wherein the anterior muscles of the thigh contracts by reflex as... Read More
Sex-determining Region Y gene
Definition noun The gene that codes for the SRY protein, which is associated with the testicular development in many male... Read More