A structure that is made up of two or more tissues working together to perform a specific function.
organ
A group of cells that work together to perform a specific job.
tissue
The organelle in which sugar is broken down to produce energy.
mitochondria
A microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles.
Prokaryote
An organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus
eukaryote
Any of a number of organized or specialized structures within a living cell.
organelle
A dense organelle present in most eukaryote cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
nucleus
The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane
cell
The semipermeable membrane surrounding the cytoplasm of a cell
cellmembrane
A plastid that contains chlorophyll and in which photosynthesis takes place
chloroplast
A rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria
cell wall
A group of organs that work together to perform one or more functions.
organsystem
An individual animal, plant, or single-celled life form
organism
An organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane
lysosome
The material or protoplasm within a living cell, excluding the nucleus.
cytoplasm