What is metabolism? | Classification of metabolism

What is metabolism?


Biochemistry is the branch of biology that deals with the study of chemical components and chemical processes in living organisms.

It encompasses a wide range of fields including molecular biology, genetics, pharmacology, and physiology. Biochemists study the chemical reactions and pathways that occur within cells and organisms, and the molecules involved in these processes.

Biochemistry plays a crucial role in understanding the fundamental processes of life, and has important applications in medicine, agriculture, and biotechnology.

All living things are made-up of certain chemical compounds which are generally classified as organic and inorganic compounds.

Difference between chemical composition of bacterial and mammalian cells


70% in both bacterial and mammalian cells.


15% in bacterial cell an 18% in mammalian cell.


3% in bacterial cell and 4% in mammalian cell.


2% in bacterial cell and 3% in mammalian cell.


1% in bacterial cell and 0.25% in mammalian cell.


6% in bacterial cell and 1.1% in mammalian cell.

Other organic molecules:

(Enzymes, hormones, metabolites) 2% in both bacterial and million cell.

Inorganic ions:

1% in both bacterial and Mammalian cell.

What is metabolism?


All the chemical reactions take place within a cell or collectively called metabolism.

Metabolism refers to the set of chemical reactions that occur within living organisms to sustain life. These reactions involve the breakdown of molecules (catabolism) to release energy and the synthesis of molecules (anabolism) to build and maintain cellular structures and functions.

Metabolism is regulated by a complex network of enzymes and hormones that control the rate and direction of metabolic pathways. These pathways are highly interconnected and can be influenced by factors such as diet, exercise, and stress.

Disruptions in metabolism can lead to a wide range of diseases and disorders, such as obesity, diabetes, and cancer. Understanding the mechanisms of metabolism is crucial for developing effective treatments for these conditions.

Metabolism is a fundamental process that allows living organisms to survive and thrive, and is a key area of research in biochemistry and molecular biology.

classification of metabolism

Metabolic processes are characterised as anabolism and catabolism

Classification of metabolism

What is anabolic reactions?

Anabolic reactions:

Anabolic Reaction

Reactions in which simpler substances are combined to form complex substances are known as anabolic reactions.

These reactions require energy input, typically in the form of ATP, and involve the formation of chemical bonds. Anabolic reactions are the opposite of catabolic reactions, which break down complex molecules into simpler ones.

Anabolic reactions need energy.

Examples of anabolic reactions

The process of building proteins from amino acids. This process requires energy and is essential for growth and repair of tissues.

The process by which plants use sunlight to synthesize carbohydrates from carbon dioxide and water.

The synthesis of fats from simple precursors such as glucose.

The synthesis of glycogen from glucose.

The process of building DNA and RNA from nucleotides.

Anabolic reactions are important for maintaining and building the complex molecules that make up living organisms. They are essential for growth, repair, and maintenance of tissues, and for the production of energy stores in the form of glycogen and fat.

What is catabolic reactions?

Catabolic reactions:

Catabolic reaction

Catabolic reactions are metabolic processes that break down complex molecules into simpler ones, releasing energy in the process. These reactions are the opposite of anabolic reactions, which build complex molecules from simpler ones.

Catabolic reactions release energy.

Examples of catabolic reactions

The method by which cells break glucose to make energy in the form of ATP.

The breakdown of food molecules into smaller components such as glucose, amino acids, and fatty acids.

The breakdown of glucose into pyruvate, which can then enter cellular respiration.

The breaking of fats into fatty acids and glycerol.

The breakdown of proteins into amino acids.

Catabolic reactions are important for generating energy and breaking down molecules that are no longer needed by the body. The energy released during catabolism is used to power anabolic reactions that build new molecules and perform other cellular processes.

Importance of metabolism:

Metabolism is responsible for converting the energy stored in nutrients such as glucose, fats, and proteins into ATP, which is the primary energy currency of cells. Without metabolism, cells would not be able to produce the energy needed to carry out their functions.

Metabolism is involved in the synthesis of complex molecules such as proteins, nucleic acids, and lipids. These molecules are used to build and repair cells and tissues, and to maintain the body’s structure and function.

Metabolism is also responsible for breaking down and eliminating waste products from the body. This includes the breakdown of toxins and other harmful substances, as well as the removal of carbon dioxide and other metabolic waste products.

Metabolism is involved in the regulation of many physiological processes, including the regulation of body temperature, blood sugar levels, and hormone levels.

Metabolism allows organisms to adapt to changing environmental conditions by regulating the synthesis and breakdown of different molecules as needed.

Learn more

What is biological molecules?

What is biochemistry?

Comparison of the chemical composition of bacterial and mammalian cells

Difference between the chemical composition of bacterial and mammalian cells

what is the difference between Bacterial and mammalian cells?

What is metabolism?

Classification of metabolism

Characterization of metabolism

Types of metabolism

Classes of metabolism

What is anabolic reactions?

Does anabolic reactions need energy?

What is catabolic reactions?

Does catabolic reactions release energy?

Examples of anabolic reactions

Examples of catabolic reactions

Examples of catabolic and anabolic reactions

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