What is an enzyme and how are enzymes important in living organisms?

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Enzymes play the main role of catalysis. they are activators.

Inhibitor stopes the reaction where as activator activtes the reaction and make the reaction to move forward by increaseing the rate of the rection that is decreasing the activation energy.

Enzymes are mainly proteins, it is said that all enzymes are proteins but all proteins are not enzymes. Enzymes are also called as biocatalyst.

They are globular in shape

They are very specific to there substrated (Lock and key mechanism theory)

Enzyme activity is affected by substrate concentration, temperature, PH and inhibitors.

They have active site where the substrate bindes.

They need cofactores to perform complete function.

There are various classes of Enzymes they are 






Ligases. ets.,

Examples of Exzymes...






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Enzymes are organic catalysts which aid in facilitating chemical reactions in the body. Enzymes are needed for metabolic pathways in the body, respiration, digestion and other important life processes. When enzymes function properly, homeostasis is maintained. However, if an enzyme is lacking or has an incorrect shape due to a genetic mutation, this can lead to disease within an organism. An example of this is the disease phenylketonuria or PKU. It is an autosomal recessive disorder which involves a gene mutation in the gene for the enzyme phenylalanine hydroxylase(PAH). This enzyme is part of a metabolic pathway in which the amino acid phenylalanine is converted to tyrosine. In the person with PKU disease, they have an enzyme that is defective and the activity is reduced. Therefore, phenylalanine accumulates and is converted to phenylpyruvate, which is found in the urine. It also builds up in the brain, leading to mental retardation and brain damage. By restricting the person's intake of protein, which contains phenylalanine, the person can have a normal life span and mental development. This is but one example of the many enzymes which have very necessary and specific functions in the body.

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What is the role of enzymes and their importance in living organisms?

Enzymes are special proteins that serve to facilitate the functions of various biological processes. First and foremost, they speed up metabolic processes. This means that enzymes help break down some substances and build up others inside living things. They can do this without being altered themselves and without upsetting the chemical equilibrium that exists between reactants and their products. This makes them an essential part of digestion, respiration, growth, healing, and detoxification.

Every enzyme has a particular function. This function is determined through its active site, a part of the enzyme which has a specific configuration meant to connect with a particular substrate.

When an organism lacks enough of a particular enzyme, any one of a number of metabolic disorders can ensue. Not having enough of the right enzymes can make it hard to digest certain foods. For instance, lactose intolerance is the result of not producing enough of the enzyme lactase which breaks down the sugars found in dairy.

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