In the formation of a macromolecule, what type
of reaction would join two subunits together?
1. hydrophobic reaction
2. hydrolysis reaction
3. dehydration reaction
4. denaturation reaction

During catalytic cycle of an enzyme–

1. Enzyme alter its shape to fit the substrate
molecule.

2. Substrate alter its shape to get fit into the
enzyme molecule.

3. Both enzyme and substrate changes its shape
during transition state.

4. Enzyme and substrate are rigid molecular
structure and it never changes its shape.

How many statements are false from given
information?
(a) Ribozymes are enzyme made up of protein.

(b) In every chemical reaction transition state
energy is always greater than activation energy.

(c) Co-factors are always proteinous in nature

(d) Enzyme inhibition can not be removed.

(e) Enzyme action can be stopped at low temp.

(f) Km value (Michaelis constant) is the specific
concentration of substrate molecule.

1. 2 

2. 3

3. 4 

4. 5

Select the option which is incorrect for enzyme catalase.

1. The cofactor present is inorganic and proteinaceous in nature

2. Haem is the prosthetic group required by the enzyme

3. The cofactor required for optimal activity must be tightly bound to the apoenzyme

4. It catalyses breakdown of hydrogen peroxide to water and oxygen

Select the correct statement 

1. The base pairs in DNA are stacked 0.34 nm apart
2. The diameter of a right handed helical ds B-DNA molecules is 34 $\stackrel{\mathrm{o}}{\mathrm{A}}$

3. Sugar-phosphate and hydrogen bonds are both present in a single nucleotide such as AMP

4. A and T of one strand compulsorily base pair with G and C respectively, of other strand is DNA

The rate of enzyme action decreases at higher temperature [after a certain value] because the increased heat

What level of protein organization structure explains the 3-D shape of an enzyme?

• Look at the graph given below. The reaction rate the reaction can be increased beyond point C by:

An example of protein with quaternary structure is 

1. Myoglobin

2. Hemoglobin

3. Keratin

4. All of these

Enzymes catalyse biochemical reactions by

1. Lowering the activation energy

2. Increasing the activation energy

3. Establishing stable bonds with substrate

4. Increasing temperature