Conjugate Enzymes

Q.

The cofactor of the enzyme carboxypeptidase is

1. copper

2. iron

3. zinc

4. manganese

Q. Which of the following is not an intermediate of Krebs cycle?

1. 𝝰.-ketoglutarate
2. malate
3. PGAL
4. OAA

Q. Identify the organic compound which is associated with the apoenzyme transiently.

1. Prosthetic group
2. Coenzymes
3. Metal ions
4. Both a and b

Q. Which of the following is false with respect to prosthetic groups?

1. Proteins
2. Non-proteins
3. Tightly bound to enzymes
4. Organic compounds

Q. How many gametes are required to produce 80 seeds in a typical flowering plant?
[0.7 mark]

1. 120
2. 80
3. 240
4. 160

Q. Consider the following statements:
(A) Co-enzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.

Select the correct option.

1. (A) is false but (B) is true
2. Both (A) and (B) are true
3. (A) is true but (B) is false
4. Both (A) and (B) are false

Q. The protein component of a holoenzyme is known as

1. coenzyme
   
2. enzyme
3. constant
4. unit

Q.

Is apoenzyme a part of holoenzyme?

Q.

Enzymes with cofactors are called __(i)__. Based on the structure and function, the cofactors are grouped as__(ii)__, __(iii)__ and __(iv)__.

1. (i) Metal ions (ii) Apoenzymes (iii) Prosthetic groups (iv) Coenzymes.

2. (i) Holoenzymes (ii) Prosthetic groups (iii) Coenzymes (iv) Metal ions.

3. (i) Prosthetic groups (ii) Coenzymes (iii) Metal ions (iv) Apoenzymes.

4. (i) Coenzyme (ii) Metal ions (iii) Apoenzymes (iii) Prosthetic groups.

Q. Which of these metals is a part of Vitamin B₁₂?

1. Ca (II)
2. Zn (II)
3. Fe (II)
4. Co (III)

Q. Which of the following statements is correct with reference to enzymes?

1. Apoenzyme = Holoenzyme + Coenzyme
2. Holoenzyme = Apoenzyme + Coenzyme
3. Coenzyme = Apoenzyme + Holoenzyme
4. Holoenzyme = Coenzyme + Co-factor
   

Q. A gametophyte dependent on sporophyte is found in

1. Polytrichum
2. Pteris
3. Marchantia
4. Hibiscus

Q. In angiosperms, microsporogenesis and megasporogenesis:

1. occur in anther
2. form gametes without furthers divisions
3. occur in ovule
4. involve meiosis

Q. The cofactor for the enzyme carboxypeptidase is

1. copper
2. iron
3. zinc
4. manganese

Q. The cofactor present in the microbial enzyme catalase-peroxidase is:

1. NADP
2. NAD
3. Haem
4. Zn

Q. Assertion (A): A coenzyme or metal ion that is very tightly bound to enzyme protein is called prosthetic group.
Reason (R): A complete catalytically active enzyme together with its bound prosthetic group is called apoenzyme.

1. Both A and R are correct and R is the correct explanation of A
2. Both A and R are correct, but R is the correct explanation of A
3. A is correct but R is incorrect
4. Both A and R are incorrect

Q. Assertion (A) : Coenzymes serve as cofactors in a number of different enzyme catalyzed reactions
Reaction (R) : Coenzymes and prosthetic groups are cofactors

1. Both A and R are correct and R is the correct explanation of A
2. Both A and R are correct and R is not the correct explanation of A
3. A is correct but R is incorrect
4. Both A and R are incorrect

Q.

All the following are coenzymes except

1. NAD

2. VLDL

3. FAD

4. FMN

Q.

Which one of these is not a characteristic of prosthetic groups?

1. They are made up of amino acids

2. They are inorganic compounds

3. They are tightly bound to the apoenzyme

4. They are a category of cofactors

Q. Identify the organic compound which is associated with the apoenzyme transiently.

1. Prosthetic group
2. Coenzymes
3. Metal ions
4. Both a and b