Enzymes
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 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
Given below are two statements :
Statement I : Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement II : When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.
In the light of the above statements, choose the correct answer from the options given below :
Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:
Which one of the following statement is correct, with reference to enzyme?
All the given statements are correct except one which is incorrect:
Which of the following rules states that with the increase of every , the metabolic rate doubles
Select the option which is not correct with respect to enzyme action:
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?
How many of the following list are not the polymers of amino acids?
RuBisCO, Hind III, pBR322, Porins, Ribozymes, Lecithin, Serine, DNAse
With reference to enzymes, turnover number means
During enzymatic reactions, enzyme-substrate complex is:
Read the following statements:
A. Living state and metabolism are synonymous.
B. All enzymes are proteins without any exception.
C. Zn acts as a cofactor for the enzyme carbonic anhydrase.
D. At high temperatures inorganic catalysts work efficiently while the enzymes are damaged.
Correct statements are:
Above , what will be the appropriate effect on enzymes and inorganic catalysts?
What will happen, if cofactor is removed from a holoenzyme?
Which of the following combinations is correct?
Enzymes catalysing the linking together of two compounds, for example, enzymes which catalyse the joining of etc., bonds belongs to the class of
Enzymes which catalyse the transfer of group other than hydrogen belongs to the class
Enzymes which catalyse oxidoreduction between two substrate belongs to the class
