Description : difference between apoenzyme and holoenzyme -Biology
Last Answer : answer:
Description : Lactose or its analogues act as positive regulators of lac operon by (A) Attaching to i gene and preventing its expression (B) Increasing the synthesis of catabolite gene activator protein (C) ... holoenzyme (D) Binding to repressor subunits so that the repressor cannot attach to the operator locus
Last Answer : Answer : D
Description : Binding of RNA polymerase holoenzyme to the promoter region of lac operon is facilitated by (A) Catabolite gene activator protein (CAP) (B) cAMP (C) CAP-cAMP complex (D) None of these
Last Answer : Answer : C
Description : RNA polymerase holoenzyme binds to lac operon at the following site: (A) i gene (B) z gene (C) Operator locus (D) Promoter region
Description : DNA polymerase III holoenzyme possesses (A) Polymerase activity (B) 3’→5’ Exonuclease activity (C) 5’→3’ Exonuclease and polymerase activities (D) 3’→5’ Exonuclease and polymerase activities
Description : Negative supercoils are introduced in DNA by (A) Helicase (B) DNA ligase (C) DNA gyrase (D) DNA polymerase III holoenzyme
Description : Ribonucleotides of RNA primer are replaced by deoxyribonucleotides by the enzyme: (A) DNA polymerase I (B) DNA polymerase II (C) DNA polymerase III holoenzyme (D) All of these
Last Answer : Answer : A
Description : Deoxyribonucleotides are added to RNA primer by (A) DNA polymerase I (B) DNA polymerase II (C) DNA polymerase III holoenzyme (D) All of these
Description : Combination of apoenzyme and coenzyme produces (A) Prosthetic group (B) Holoenzyme (C) Enzyme substrate complex (D) Enzyme product complex
Last Answer : Answer : B
Description : Cofactor (Prosthetic group) is a part of holoenzyme, it is (A) Inorganic part loosely attached (B) Accessory non-protein substance attached firmly (C) Organic part attached loosely (D) None of these
Description : An organic substance bound to an enzyme and essential for the activity of enzyme is called (A) Holoenzyme (B) Apoenzyme (C) Coenzyme (D) Isoenzyme
Description : A Holoenzyme is (A) Functional unit (B) Apo enzyme (C) Coenzyme (D) All of these
Description : Protein part of enzyme is know as – (1) Isoenzyme (2) Holoenzyme (3) Apoenzyme (4) All the above
Last Answer : (3) Apoenzyme Explanation: Enzymes are defined as biological catalysts. Chemically all enzymes are globular proteins. Each enzyme catalyses only one chemical reaction. Protein part of enzyme is known as Apoenzyme.
Description : During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called? (a) AAAT box (b) TATA box (c) GGTT box (d) CAAT box
Last Answer : (c) GGTT box
Last Answer : (b) TATA box
Description : Co-factor (prosthetic group) is a part of holoenzyme. It is (a) loosely attached organic part (b) loosely attached inorganic part (c) accessory non-protein substance attached firmly (d) none of these.
Last Answer : (c) accessory non-protein substance attached firmly
Description : Which of the following statements is correct with reference to enzymes? (a) Holoenzyme = Apoenzyme + Coenzyme (b) Coenzyme = Apoenzyme + Holoenzyme (c) Holoenzyme = Coenzyme + Co-factor (d) Apoenzyme = Holoenzyme + Coenzyme
Last Answer : a) Holoenzyme = Apoenzyme + Coenzyme
Description : The active form of enzyme is A- apoenzyme B- coenzyme C- holoenzyme D- none of these
Last Answer : holoenzyme
Description : Protein portion of an enzyme when it is combined with organic molecule is termed as A- apoenzyme B- co-enzyme C- holoenzyme D- co-factors
Last Answer : apoenzyme
Description : The transcription initiation factor associated with the RNA polymerase holoenzyme in prokaryotes is (a) β (b) ω (c) σ (d) αI
Last Answer : c) σ (
Description : Which one of the following statements is correct , with reference to enzymes ? (1) Holoenzyme = Apoenzyme + Coenzyme (2) Coenzyme = Apoenzyme + Holoenzyme (3) Holoenzyme = Coenzyme + Co-factor (4) Apoenzyme = Holoenzyme + Coenzyme
Last Answer : (1) Holoenzyme = Apoenzyme + Coenzyme
Description : Protein part of enzyme is know as (1) Isoenzyme (2) Holoenzyme (3) Apoenzyme (4) All the above
Last Answer : Apoenzyme