- The term enzyme was first introduced by the _.
a. Emil Fisher
b. W. Kuhne
c. F. Miescher
d. F. Sanger - An energy present in the system existing for the work?
a. Enthalpy
b. Entropy
c. Free energy
d. All are similar terms - Which one is incorrect about enzymes?
a. A macromolecule
b. Always protein in its composition
c. Colloidal substances
d. All are correct - Which one is incorrect about enzymes?
a. Disturbs equilibrium reaction
b. Form micelle in cytosol
c. Many organic solvents denature the enzymes
d. All are correct - Which does not denature the enzymes?
a. Heat
b. Metal ions
c. Aqueous media
d. Inhibitors - Which one of the following is not a coenzyme?
a. NAD
b. NADP
c. ATP
d. All are coenzymes - Usually, active site is formed by the interactions of __ of amino acids?
a. – COOH
b. – NH3
c. – H
d. – R - Separate the unrelated terms from the following?
a. Enzyme Precursors
b. ES Complex
c. Inactive enzymes
d. Proenzymes - Succinate __ convert succinate into fumarate?
a. Oxidase
b. Catalase
c. Dehydrogenase
d. Isomerase - Which one not involve in the specificity of enzymes active site?
a. Specific three-dimensional configuration
b. Definite shaped active site
c. Charge bearing active site
d. Number of amino acids - When did International Union of Biochemistry recommended a systematic nomenclature design for enzymes?
a. 1900
b. 1949
c. 1961
d. 1989 - Which one is incorrect about Coenzymes?
a. Non-proteins
b. Organic molecules
c. Vitamin’s derivatives
d. All are correct - The idea of ES Complex was proposed by?
a. L. Michaelis
b. M. L. Menton
c. Both
d. None - Which one is not related to a complex enzyme?
a. Require some non-protein part
b. Conjugated enzymes
c. May be in the form of apoenzymes or holoenzymes
d. All are RNA Enzymes - Which one is incorrect about the FMN and FAD?
a. Vitamin B2 derivatives
b. Act as hydrogen carriers
c. Easily subjected to calcium poisoning
d. All are correct - If an enzyme that will only able to catalyze on reaction, this specificity will be?
a. Rigid
b. Pointed
c. Targeted
d. Absolute - The enzymes involve in the Hydrogen removal from a substrate?
a. Oxidoreductase
b. Lyases
c. Hydrolase
d. None - Hydrolase cleave __ by the addition of water?
a. C – O
b. C – C
c. C – N
d. All - Lyases cleaves the __ by elimination. Leaving double bods?
a. C – O
b. C – C
c. C – N
d. All - Optimum pH for the pancreatic lipase is?
a. 2.0
b. 7.0
c. 8.0
d. 4.0 – 5.0 - Optimum pH for the trypsin is _?
a. 2.0
b. 7.8 – 8.7
c. 8.0
d. 4.0 – 5.0 - The enzyme work at neutral pH is?
a. Urease
b. Catalase
c. Both
d. None - Reactants (A – B + C) and products are (A + B – C ), select enzyme?
a. Lyases
b. Hydrolases
c. Transferases
d. Ligases - Reactants (A + B + ATP) and products are (A – B + ATP + Pi), select enzyme?
a. Lyases
b. Hydrolases
c. Transferases
d. Ligases - Allosteric enzymes are regulated by?
a. Activators
b. Coenzymes
c. Prosthetic groups
d. Effectors
Note: One thing to keep in mind is that if you want to get some benefit, you have to solve the Quiz first, and then you have to look at the key given below.
Answer Keys – 4 Stage – PPSC Biology – Quiz – 3 – Enzymology