75 results found

Search Results for: single-celled

Unicellular

Unicellular organisms are organisms consisting of one cell only that performs all vital functions including metabolism,... Read More

Sexual reproduction

Sexual reproduction is a mode of reproduction involving the fusion of haploid female gamete (egg cell) and haploid male... Read More

Taxonomy

Taxonomy Definition The term "taxonomy" was developed from two Greek words, "taxis," meaning arrangement, and "nomia,"... Read More

Organism

An organism refers to a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and... Read More

Single-celled

If an organism has one cell, they are single celled. Not to be confused with... Read More

Amoeba

In protistology, amoeba specifically pertains to the genus Amoeba (true amoeba) of the family Amoebidae, class Tubulinea.... Read More

Life

Life Definition noun, plural: lives (1) A distinctive characteristic of a living organism from dead organism or non-living... Read More

Microalgae

Microalgae are microscopic algae. They are single-celled algae that may exist independently or in colonies. They are... Read More

Eukaryote

Eukaryote refers to any of the single-celled or multicellular organisms whose cell contains a distinct, membrane-bound... Read More

Clone

Definition noun, plural: clones A propagating population of organisms, either single cell or multicellular, derived from a... Read More

Living things

Living Things Definition A living things pertains to any organism or a life form that possesses or shows the... Read More

A New Theory on the Origin of Animal Multicellularity

Multicellular life, purportedly, started around 600 million years ago. From single-celled, certain organisms eventually... Read More

Sporophyte generation

Definition noun (botany) A phase in the life cycle of certain plants and algae that starts with the union of gametes up to... Read More

Kingdom

Definition noun, plural: kingdoms In biology, kingdom is a taxonomic rank that is composed of smaller groups called phyla... Read More

Pseudopodia

A pseudopodium (plural: pseudopodia) refers to the temporary projection of the cytoplasm of a eukaryotic cell. Pseudopodia... Read More

Prokaryote

Prokaryote refers to any of the group of organisms primarily characterized by the lack of true nucleus and other... Read More

Cloning

Cloning Definition In biology, cloning is the process of producing similar populations of genetically identical individuals... Read More

Coccidia

Coccidia (singular: coccidium) are sporozoans that live as parasites of the digestive tracts of certain animals. The... Read More

Colony

Definition noun, plural: colonies (biology) Several individual organisms (especially of the same species) living together in... Read More

Ribonucleic acid

Ribonucleic Acid Definition noun (uncountable), ribonucleic acids ri·bo·nu·cle·ic ac·id, raɪboʊnjuːkliːɪk... Read More

Bryophytes

Bryophytes (nonvascular plants) do not have xylem or phloem. The habitations of this plant group are widely varied and... Read More

Biogenesis

Definition noun plural: biogeneses (1) The process in which life forms arise from similar life forms (2) A theory that... Read More

Symbiosis

Symbiosis Definition What is symbiosis? Symbiosis can be defined as any kind of relationship or interaction between two... Read More

Sporozoa

Definition noun A protozoan phylum of the Kingdom Protista of the old five kingdom scheme of classification, and includes... Read More

Protista

Definition noun A taxonomic kingdom in old system of classification (i.e. five kingdom scheme), comprised of species... Read More

Locomotion

Definition noun The ability of cells or organisms to move and propel itself from place to place Supplement Locomotion in... Read More

Budding

Budding definition In a general context, budding refers to a state where development begins. In science, its meaning refers... Read More

Apicomplexa

Definition noun A phylum comprised of protozoans characterized by having a special organelle called an apical complex, and... Read More

Protozoology

Definition noun A branch of biology that studies protozoa, which are eucharyotes characterized by being single-celled, most... Read More

Cell

A cell is a membrane-bound structure that occurs as a functional independent unit of life (such as in unicellular organisms,... Read More

Biological Cell Introduction

It only takes one biological cell to create an organism. In fact, there are countless species of single-celled organisms,... Read More

Genetic Control – On and Off Genes

Reviewed by: Mary Anne Clark, Ph.D. This lesson looks at the various factors involved that affect growth and... Read More

Sporozoan

Definition noun, plural: sporozoans Any of the numerous protozoans of the phylum (or class) Sporozoa, generally... Read More

Endosymbiotic theory

Endosymbiotic theory definition noun (evolutionary biology) A theory suggesting that the organelles such as mitochondria... Read More

Animal cell

An animal cell is the fundamental functional unit of life of animals. It is also the basic unit of reproduction. Animal... Read More

Biosphere

What is biosphere? The biosphere is that part of the Earth where living things thrive and live. It is the portion of the... Read More

Evolution of Life – Ancient Earth

Continuing from the previous tutorial investigating the origins of life on Earth.... Life began to flourish, and the... Read More

Brown algae

Brown algae are algal species characterized by being multicellular and having brown or greenish brown color. The color is... Read More

Green algae

Green algae (singular: green alga) are photosynthetic algae that are characterized by having chlorophylls a and b as the... Read More

Sporozoite

Definition noun, plural: sporozoites A minute, elongated cell that arise from the repeated division of the oocyst during... Read More