Classification of Enzymes
Classification of Enzymes: Overview
This Topic covers sub-topics such as Enzymes, Activation Energy, Enzyme Inhibition, Coenzyme, Cofactors, Ribozyme, Competitive Inhibition, Apoenzymes, Enzyme Structure, Prosthetic Group, Nomenclature of Enzymes, Holoenzymes and, Active Site of Enzymes
Important Questions on Classification of Enzymes
Hydrolytic enzymes which act on low pH are called as
The class of enzyme that catalyzes the reaction is
S - G + S’ → S + S’ - G
What is ribozyme enzyme and how is it an exception?
Which of the following is correct with respect to the of the enzyme on the equilibrium position?
Study the given data and answer the following question.
A sample of an enzyme called lactase was isolated from the intestinal lining of a calf. Assays were undertaken to evaluate the activity of the enzyme sample. The substrate of lactase is the disaccharide lactose. Lactase breaks a lactose molecule in two, producing a glucose molecule and a galactose molecule.
Two assays were carried out.
Assay 1:
| Lactose concentration (% w/v) | 15 | 15 | 15 | 15 | 15 | 15 |
| Concentration of enzyme sample (% v/v) | 0 | 5 | 10 | 15 | 20 | 25 |
| Reaction rate glucose sec-1 mL-1 | 0 | 25 | 50 | 75 | 100 | 125 |
Assay 2:
| Lactose concentration (% w/v) | 0 | 5 | 15 | 20 | 25 | 30 |
| Concentration of enzyme sample (% v/v) | 5 | 5 | 5 | 5 | 5 | 5 |
| Reaction rate glucose sec-1 mL-1 | 0 | 15 | 25 | 35 | 40 | 40 |
Which of the following statements can be concluded from the two assays?
With reference to enzymes, turnover number means
During enzymatic reactions, enzyme-substrate complex is:
Select the correct option:
Assertion: All proteinaceous enzymes have a three-dimensional structure.
Reason: The secondary structure of a protein is according to amino acids present inside the polypeptide.
Match the entries in column I and Column II. Which one of the following choices is correct?
| Column I | Column II | ||
| (a) | Haeme | (1) | Cofactor |
| (b) | (2) | Vitamin | |
| (c) | Zinc | (3) | Coenzyme |
| (d) | Niacin | (4) | Prosthetic group |
Which group of enzymes catalyses reactions involving a structural rearrangement of a molecule?
Which among the following enzymes, help in joining the molecules together?
If an enzyme reaction follows the Michaelis Menten kinetics represented by the equation:
Where is the initial reaction velocity, is the maximal reaction velocity, is the Michaelis constant, and [S] is the substrate concentration. Which of the following statements is correct?
Enzymes functional inside the cells are called:
Protein nature of enzyme was first discovered by:
Which of the following is a cofactor of carboxypeptidase, a proteolytic enzyme?
