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|The definition of cytology is a branch of biology that studies the structure and function of plant and animal cells
|The cell is the basic structural, functional, and biological unit of all known living organisms
|an organelle is a specialized sub unit within a cell that has a specific function.
|An organism refers to any individual living thing that can react to stimuli, reproduce, grow, and maintain homeostasis.
|A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell
|Having or consisting of many cells or more than one cell to perform all vital functions
|a cell lacking a true membrane-bound nucleus
|A microscopic single-celled organism which has neither a distinct nucleus with a membrane nor other specialized organelles, including the bacteria and cyanobacteria
|An organism whose cells contain a nucleus surrounded by a membrane and whose DNA is bound together by proteins into chromosomes.
|The cells of eukaryotes also contain an endoplasmic reticulum and numerous specialized organelles not present in prokaryotes, especially mitochondria, Golgi bodies, and lysosomes.
|a theory in biology that includes one 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.
|A virus is a small infectious agent that replicates only inside the living cells of other organisms.
|tissue is a cellular organizational level between cells and a complete organ.
|a group of tissues in a living organism that have been adapted to perform a specific function
|Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input
|Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides
|the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
|A membrane that is selectively permeable, i.e. being permeable to only certain molecules and not to all molecules
|s the process by which a cell—often a phagocyte or a protist—engulfs a solid particle to form an internal compartment known as a phagosome.
|the ingestion of liquid into a cell by the budding of small vesicles from the cell membrane.