Conjugate Enzymes

Q.

Consider the following statements :

(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called a 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.

What is the difference between NADPH and NADH?

Q.

Define Enzymes, co factors , co enzymes and apoenzyme.

Q.

How are prosthetic groups different from co-factors ?

Q.

What is the full form of ALGOL, COBOL, FORTRAN?

Q. The essential chemical components of many coenzymes are:

1. Proteins
2. Nucleic acids
3. Carbohydrates
4. Vitamins

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

Q.

How does pH affect fermentation?

Q.

The protein part of an enzyme is called:

1. Endosyme

2. Apoenzyme

3. Coenzyme

4. Lysozyme

Q. The non-protein constuituents which are bound to the enzyme are called whereas the protein part of an enzyme is known as .

1. co-factors
2. co-enzymes
3. apoenzymes
4. prosthetic groups

Q. Identify the correct statements for ATP synthase.
(i) This enzyme consists of two parts: hydrophobic membrane bound portion called F₀ & a portion that sticks out into stroma called F₁.
(ii) F₀ appears to form a channel across the membrane through which proton can pass.
(iii) The conformational change in the F₁ portion of the complex synthesizes ATP.
(iv) The proton motive force that drives the synthesis of ATP is associated with this enzyme.

1. (i), (ii) and (iii)
2. (i), (ii) and (iv)
3. (i) and (iv) only
4. All of these

Q.

Which hormone is responsible for blood clotting?

Q.

All the following are coenzymes except

1. NAD

2. VLDL

3. FAD

4. FMN

Q. NAD and NADP are

1. participants as cofactor in both non-catalytic and enzyme catalysed reactions
2. not a participant in any catalytic reaction
3. participants as cofactors in non-catalytic reaction
4. participants as cofactor in enzyme catalysed reaction

Q. Which of the following is not a correct pairing of a macronutrient and the major functions it performs in the life of a plant?

1. Potassium–enzyme activation, water balance, ion balance
2. Calcium–activity of membranes and cytoskeleton, second messenger
3. Sulphur–in proteins and coenzymes
4. Iron–in active sites of many redox enzymes and electron carriers

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

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

Q. Which of the following is an organic compound?

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

Q. Which of the following is/are incorrect for enzyme?

1. Enzymes only catalyse the reaction but they are not involved in the reaction.
2. All enzymes are proteins.
3. Enzymes lower the activation energy.
4. Temperature and pH affect the activity of enzymes.

Q. The protein component of a holoenzyme is known as

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

Q. Which of the following is an inorganic part in holoenzyme?

1. Prosthetic group
2. Coenzymes
3. Metal ions
4. Apoenzymes

Q.

Pyrenoids contain

1. proteins

2. starch

3. proteins and starch

4. lipids

Q. The enzyme, which is usually secreted in the inactive state, is called

1. zymogen
2. coenzyme
3. isoenzyme
4. apoenzyme

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.

Is complex 2 a proton pump?

Q. Enzymes are basically made of

1. Fats
2. Vitamins
3. Nucleic acids
4. Proteins

Q. What are the categories of essential elements in mineral nutrition?

Q. Match the columns I and II, and choose the correct combination from the options given.
$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{a.Greeen alga}& \text{1.Dictyota}\\ \text{b. Brown alga}& \text{2. Porphyra}\\ \text{c. Red alga}& \text{3.Spirogyra}\end{array}$

Q.

The protein part of an enzyme is called:

1. Holoenzyme

2. Apoenzyme

3. Coenzyme

4. Lysozyme

Q. Thermolabile protein part of enzyme is

1. apoenzyme
2. proenzyme
3. holoenzyme
4. isoenzyme

Q. Ferric oxide crystallises in a HCP of oxide ions with two out of every three octahedral voids occupied by ferric ions . drive the formula of ferric oxide .