Q. No.km (Michaelis constant) value of enzyme is the substrate concentration at which velocity of reaction
1. Vmax
2. one fourth of Vmax
3. One third of Vmax
4. half of Vmax
Which of the following in not an example of competitive inhibition?
| 1. | Inhibition of succinic dehydrogenase by malonate |
| 2. | Inhibition of bacterial pathogens by sulpha drugs |
| 3. | Inhibition of alcohol dehydrogenase by ethanol in case of methanol poisoning |
| 4. | Inhibition of hexokinase by glucose-6-phosphate |
Which of the following is true for Non- Competitive Inhibition?
| 1. | It cannot be overcome by increasing the concentration of the substrate |
| 2. | Cyanide kills an animal by inhibiting cytochrome oxidase through non competitive inhibition |
| 3. | It does not interfere with the binding of the substrate to enzymes |
| 4. | All of these |
Which of the following class of enzyme is used for catalysing hydrolysis of ester, ether, peptide bonds?
| 1. | Lyases | 2. | Ligases |
| 3. | Hydrolases | 4. | Both A and B |
Which of the following class of enzyme catalyse removal of groups from substrates by mechanism other than hydrolysis leaving double bonds?
| 1. | Lyases | 2. | Ligases |
| 3. | Isomerases | 4. | Hydrolases |
Which of the following class of enzyme catalyse the linking together of 2 compounds?
1. Lyases
2. Ligases
3. Hydrolases
4. Transferases
Which of the following class of enzyme catalyse the joining of C-O and hydrolysis of C-N bonds respectively?
| 1. | Lyases and Ligases |
| 2. | Ligases and Lyases |
| 3. | Ligases and Hydrolases |
| 4. | Lyases and Hydrolases |
Which of the following class of enzymes helps in catalysing a transfer of a group (other than hydrogen) between a pair of substrates?
1. Ligases
2. Lyases
3. Transferases
4. Hydrolases
Electron transferring enzymes belongs to which class of enzymes
1. Transferases
2. Oxidoreductases
3. Isomerases
4. Lyases
The non- protein constituent of the enzymes are called
1. Apoenzyme
2. Holoenzyme
3. Cofactors
4. both A and C
© 2025 GoodEd Technologies Pvt. Ltd.