Advertisements
Advertisements
Question
Describe the important properties of enzymes.
Advertisements
Solution
Properties of enzymes:
- Enzymes are complex macromolecules with a high molecular weight.
- They catalyse biochemical reactions in a cell. They help in the breakdown of large molecules into smaller molecules or bring together two smaller molecules to form a larger molecule.
- Enzymes do not start a reaction. However, they help accelerate it.
- Enzymes affect the rate of biochemical reactions, not the direction.
- Most of the enzymes have a high turnover number. The turnover number of an enzyme is the number of molecules of a substance that are acted upon by the enzyme per minute. A high turnover number of enzymes increases the efficiency of the reaction.
- Enzymes are specific in action.
- Enzymatic activity decreases with an increase in temperature.
- They show maximum activity at an optimum pH of 5 –7.
- The velocity of enzyme increases with increase in substrate concentration and then, ultimately reaches maximum velocity.
APPEARS IN
RELATED QUESTIONS
Define enzymes.
Protein part of the enzyme is known as ______.
Enzymes that catalyse the interconversion of optical, geometrical, or positional isomers are
What are the factors affecting the rate of enzyme reaction?
____________ refers to enzymes that act at a site far away from the site of its synthesis.
Match the enzymes with their respective substrates and choose the correct option.
| Column I | Column II | ||
| i. | pancreatic lipase | a. | Dipeptides |
| ii. | Nucleases | b. | Fats |
| iii. | Lactase | c. | Nucleic acids |
| iv. | Dipeptidases | d. | Lactose |
Glycosidic bonds would be broken under the activity of which enzyme?
Study the following statements with respect to enzymes and select the correct option.
- Most of the enzymes work at an optimum temperature between 20°C and 35°C.
- Enzymes are destroyed at lower temperature of 10-20°C.
- Each enzyme exhibits its highest activity at a specific pH i.e. optimum pH.
Match the Column I (Enzymes) with Column II (Functions) and select the correct option:
| Column I | Column II | ||
| i. | Restriction endonuclease | a. | Joins the DNA fragments |
| ii. | Restriction exonuclease | b. | Extends primers on genomic DNA template |
| iii. | DNA ligase | c. | Cuts DNA at Specific position |
| iv. | Taq polymerase | d. | Removes nucleotides from the ends of DNA |
The enzymes get denatured ______.
Enzymes can react with acidic or basic substances due to their ______ nature.
Enzyme sucrase belongs to which one of the following classes?
In glycolysis, the enzyme dehydrogenase is involved in ______.
Choose the correct statement among the following.
Which of the following is a coenzyme?
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these ______.
What are enzymes?
Enzymes that catalyse removal of group of atoms from substrate molecule, other than hydrolysis, leaving double bonds are______.
Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of ______.
