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Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis, and addition of groups to double bonds, are called

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Important Questions on Biomolecules

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Dihydroxyacetone -3- phosphate and glyceraldehyde -3- phosphate are interconvertible. The enzyme responsible for this interconversion belongs to the category of
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Which of the following is an example of an isozyme?
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Holoenzyme is the complete enzyme consisting of an apoenzyme and a co-factor. Select the option that correctly identifies the nature of an apoenzyme and a co-factor.
  Apoenzyme Co-factor
(i) Protein Non-protein
(ii) Non-protein Protein
(iii) Protein Protein
(iv) Non-protein Non-protein
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The proteinaceous molecule that joins a non-protein prosthetic group to form a functional enzyme, is called
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Read the given paragraph and choose the correct options for the blanks.
Prosthetic groups are__(A)__ compounds distinguished from other co-factors in being __(B)__ bound to the apo-enzyme. For example, in peroxidase and __(C)__ which catalyse the breakdown of hydrogen peroxide to water and__(D)__, __(E)__ is the prosthetic group.
Select the option that correctly fills blanks in the above paragraph.
  (A) (B) (C) (D) (E)
(i) organic tightly catalase oxygen haem
(ii) inorganic loosely catalase hydrogen haem
(iii) inorganic tightly isomerase hydrogen haem
(iv) organic loosely isomerase oxygen haem
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Co-enzyme nicotinamide adenine dinucleotide (NAD) contains vitamin
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Zinc is a co-factor for which of the following proteolytic enzymes?
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Select the incorrect statement from the following.