The smallest structural and functional unit of an organism, typically microscpoic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopeic organisms typically consist of a single cell, which is wither eukaryotic or prokaryotic.
Any of a number of organized or specialized structures within a living cell.
Any of the typically unicellular microorganisms that lack a distinct nucleus and membrane-bound organelles and that are classified as a kingdom(Prokaryotae synonym Monera) or into two domains(Bacteria and Archaea)-compare eukaryote
An organism whose cells contain a nucleus surrounded by a membrane and whose DNA is bound togther by proteins (histones) into chromosomes. The cells of eukaryptes also contain an endoplasmic reticulum and numerous specialized organelles not present.
Having or consisting of many cells.
Consisting of a single cell. Characterized by the formation or presence of a single cell or cells.
Relating to or resulting from living thins, especially in their ecological relations.
Physical rather than biological; not derived from living organisms. Devoid of life; sterlie.
The sernipermeable membrane surrounding the sytoplasm of a cell
A rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higer plants, it consists mainly of cellulose
(In green plant cells) A plastid that contains chlororphyll and in which photosynthesis takes place
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energry production occur. it has a double membrane, the innerr layer being folded inward to form layers (cristae)
The material or protoplasm within a living cell, excluding the nucleus.
An organelle in the cytoplasm of eukaryotic cells containing degradative enzymes encloed in a membrane
A dense organelee present in most eukaryotic cells,typically a single rounded structure bounded by a double membrane, containing the genetic material
A theory in biology that includes on or both of the statements that the cell is the fundamental structural and functional unit of living matter and that the organism is composed of autonomous cells with its properties being the sum of those of its cells.
In biology, tissue is a cellular organizational level inter mediate between cells and a complete organ.
A part of an organism that is typically self contained and has a specific vital function, such as the heart or liver in humans
Sn organ system is a group of organs that work together to perform one or more functions. Each does a particular job in the body and is made up of certain tissues
An individual animal,plant or single-celled life form
The tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes