BIOL1001 Lecture Notes - Lecture 3: Mitochondrion

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9 Aug 2016
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Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large. The atom is the smallest and most fundamental unit of matter. Atoms form molecules which are chemical structures consisting of at least two atoms held together by one or more chemical bonds. Many molecules that are biologically important are macromolecules, large molecules that are typically formed by polymerization. An example of a macromolecule is deoxyribonucleic acid , which contains the instructions for the structure and functioning of all living organisms. All molecules, including this dna molecule, are composed of atoms. Macromolecules can form aggregates within a cell that are surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of these include: mitochondria and chloroplasts, which carry out indispensable functions. Mitochondria produce energy to power the cell while chloroplasts enable green plants to utilize the energy in sunlight to make sugars.

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