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[[File:103_Metabolism.jpg|103 Metabolism|thumb]] [[File:Catabolism,_energy_carriers_and_anabolism.png|Catabolism, energy carriers and anabolism|thumb|left]] [[File:Amino_acid_biosynthesis_overview.png|Amino acid biosynthesis overview|thumb|left]] '''Anabolism''' is the set of [[metabolic]] pathways that construct molecules from smaller units. These reactions require [[energy]], known typically as an endergonic process. Anabolism is one of the two parts of [[metabolism]], the other being [[catabolism]], where larger molecules are broken down into smaller ones, releasing energy. Anabolic processes are crucial for [[cell growth]], the repair of [[tissue]], and the storage of energy for future use.

==Overview==
Anabolism involves the synthesis of complex molecules such as [[proteins]], [[nucleic acids]], [[carbohydrates]], and [[lipids]] from simpler molecules like [[amino acids]], [[monosaccharides]], [[glycerol]], and [[fatty acids]]. These processes are vital for the growth and maintenance of cells and tissues, as well as for the storage of energy in efficient forms such as [[glycogen]] and [[triglycerides]]. Anabolic pathways are controlled by a set of [[enzyme]]s that require energy inputs, primarily in the form of [[adenosine triphosphate]] (ATP), to drive the reactions forward.

==Key Processes==
===Protein Synthesis===
[[Protein synthesis]] is a primary example of anabolism, where [[ribosomes]] create proteins by forming peptide bonds between amino acids. This process, also known as translation, is essential for cell structure, function, and regulation.

===Nucleic Acid Synthesis===
The synthesis of [[nucleic acids]], including [[DNA]] and [[RNA]], is another critical anabolic process. It involves the assembly of nucleotides into long chains, which are necessary for genetic information storage and transmission.

===Photosynthesis===
[[Photosynthesis]] is a unique form of anabolism that occurs in [[plants]], [[algae]], and some [[bacteria]]. It converts [[carbon dioxide]] and [[water]] into [[glucose]] and [[oxygen]] using sunlight as energy. This process is fundamental for the energy flow in the [[ecosystem]].

===Lipid Synthesis===
Lipid synthesis involves the creation of fats and [[steroids]] from simpler molecules. This process is essential for creating cell membranes, storing energy, and producing signaling molecules.

==Regulation==
Anabolic processes are tightly regulated to ensure that they occur as needed. Hormones such as [[insulin]], [[growth hormone]], and [[testosterone]] play significant roles in promoting anabolic pathways. Conversely, conditions of stress or starvation can lead to the downregulation of these pathways in favor of catabolism, which provides immediate energy to the body.

==Clinical Significance==
Disruptions in anabolic pathways can lead to various diseases. For example, an inability to effectively perform protein synthesis can result in muscle wasting conditions. Additionally, excessive or unregulated anabolism can contribute to conditions such as [[cancer]], where abnormal cell growth is a primary characteristic.

[[Category:Metabolism]]
[[Category:Biochemistry]]

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Anabolism - Revision history

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