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CELL BIOLOGY

Cell Biology 1. Levels of Organization Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large.  The atom  ( such as oxygen, hydrogen, carbon, nitrogen,..)  is the smalles t  and most fundamental unit of matter.  Atoms form molecules  ( such as monosaccharide, amino acid, glycerol, ...) which is a chemical structure consisting of at least two atoms held together by one or more chemical bonds.  Many molecules that are biologically important are macromolecules . There are 4 important kinds of macromolecules in living organism: carbohydrate, protein, nucleic acid and lipid.  The aggregates of macromolecules lead to the formation of organelles .  When organelles surrounded by membranes and carry out indispensable functions, these are called cell .  All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.  This requirement is why viruses a
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Biology - Amazing world

Biology is the natural science that studies life and living organisms , including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution. Biology recognizes: - the cell as the basic unit of life, - genes as the basic unit of heredity, - evolution as the engine that propels the creation and extinction of species The living organism is considered an open system because they absorb energy and release heat and metabolic waste.

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