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What are Cells?
Terms in this set (24)
An organism made up of more than
one, often different, cells.
An organism made up of one cell.
An extract of certain species of red seaweed that is used as a gelling agent in microbiology and food preparation.
A type of prokaryotic organism lacking a cell nucleus, similar to bacteria but now considered as a domain in their own right.
Adenosine triphosphate, a molecule that acts as an energy store in all living cells.
Single-celled microorganisms, which do not have a nucleus and reproduce by simple cell division.
The basic structural and functional unit of life.
The cycle of events involved in normal cell growth and division in multicellular organisms.
The process by which a single parent cell divides into two or more daughter cells.
A flexible or rigid boundary protecting a cell, outside the cell membrane. Animal cells do not have cell walls, but many plant and bacterial cells do.
An optical microscope which uses two sets of lenses called the objective and the eyepiece, to gather and magnify light.
The thick liquid medium that fills all cells and is contained by the cell membrane. The cytoplasm is where most of the cell's chemical reactions take place.
Organisms whose cells contain complex membrane-bound structures called organelles.
The process by which cells can divide to produce two genetically identical cells.
The formation of atomic nuclei from neutrons, protons and smaller nuclei.
In biology, the nucleus is the membrane-bound structure inside eukaryotic cells that contains most of the genetic material.
Organisms whose cells lack a nucleus and other membrane-bound structures.
Large molecules that are polymers of amino acids, linked in long chains by peptide bonds.
A positively charged particle found in the nucleus of all atoms.
A fundamental particle, and the components from which protons and neutrons in atomic nuclei are made.
In living organisms, receptors are proteins often found on the surface of a cell, which can bind to a specific signaling molecule or external stimulus, triggering a response.
The structures inside cells that synthesize proteins.
(Ribonucleic acid) A nucleic acid similar to DNA.
The cell produced by the fusion of an egg and a sperm at fertilization.
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