k_m (Michaelis constant) value of enzyme is the substrate concentration at which velocity of reaction

1. V_max

2.  one fourth of V_max

3. One third of V_max

4. half of V_max

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

The  protein constituent of the enzymes are called

1. Apoenzyme

2. Prosthetic group

3. Co-enzymes

4. Holoenzyme

Which of  the following are co-factors?

1. Co-enzymes

2. Metal ions

3. Posthetic groups

4. All of these