tem 35 Organic cofactors are referred to as _________. Fill in the blank Item36 Item Item 36 Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the Multiple Choice a. allosteric site, and its effectiveness is not influenced by substrate concentration. b. allosteric site, and its effectiveness depends on substrate concentration. c. active site, and its effectiveness is not influenced by substrate concentration. d. active site, and its effectiveness depends on substrate concentration. e. substrate, and its effectiveness depends on product concentration. Item37 Item 37 A substance that binds to the active site of an enzyme and turns it off is called a _________ inhibitor. Fill in the blank Item 38 Lactase is an enzyme that digests lactose. True or False Item 39 Exergonic reactions do not require activation energy. True or False
Item 35
Organic cofactors are referred to as _________.
Item 36
Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the
Item 37
A substance that binds to the active site of an enzyme and turns it off is called a _________ inhibitor.
Item 38
Lactase is an enzyme that digests lactose.
Item 39
Exergonic reactions do not require activation energy.
A cofactor is the non-protein component of an enzyme that is necessary for the enzyme to perform its enzymatic activity. Cofactors can be inorganic ions and organic molecules. Organic cofactors enzymes are called coenzymes.
Noncompetitive inhibition occurs when the inhibitor binds to the enzyme other than the active site. The conformational change caused due to inhibitor binding leads to inhibition of enzymatic activity. This type of inhibition is also called allosteric inhibition and substrate concentration has no effect on inhibition.
An inhibitor may bind to an enzyme and block binding of the substrate is called competitive inhibition, since in such a situation the inhibitor “competes” with the substrate for binding to the enzyme.
Lactase breaks down the lactose in food and enables absorption of lactose in the body. Insufficient production of lactase leads to lactose intolerance.
Exergonic reactions are characterized by negative change in free energy and there is a net release of energy due to the reaction. However. activation energy might still be necessary in order for the reaction to be initiated.
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