Which is not a macromolecule?

(1) DNA

(2) Starch

(3) Palmitate

(4) Insulin

The reaction of concentrated sulphuric acid with carbohydrates $\left(C_{12}{H}_{22}{O}_{11}\right)$ is an example of

1. Dehydration

2. Oxidation

3. Reduction

4. Sulphonation

Molybdoenzymes can both oxidize as well as reduce the substrates, because

1. Mo(VI) is more stable than Mo(IV)

2. Mo(IV) can transfer oxygen atom to the substrate and Mo(VI) can abstract oxygen atom from the substrate

3. Conversion of Mo(VI) to Mo(IV) is not favoured

4. Mo(VI) can transfer oxygen atom to the substrate and Mo(IV) can abstract oxygen atom from the substrate

Oxidized form of enzyme catalase (structure A); prepared by the reaction of [Fe(P)]⁺ (P=porphyrin) with H₂O₂ has a green colour because of

1. Oxidation state of iron changed from Fe^III to Fe^IV.

2. Porphyrin ring is oxidized by one electron.

3. $\mathrm{\pi }-\mathrm{\pi }*$ transition appears in the visible region

4. Fe^IV is coordinated with anionic tyrosinate ligand in axial position.

The extent of $\mathrm{\pi }$ electron conjugation in macrocyclic rings (i) heme, (ii) coenzyme B₁₂ and (iii) chlorophyl follows the order

1. (i)>(iii)>(ii)

2. (i)>(ii)>(iii)

3. (iii)>(i)>(ii)

4. (ii)$\approx$(i)>(iii)

Iron-sulphur clusters in biological systems are involved in

1. proton transfer

2. atom transfer

3. group-transfer

4. e^- transfer

The reduction of nitrogen to ammonia, carried out by the enzyme nitrogenase needs

1. 2e^- 

2. 4e^- 

3. 6e^- 

4. 8e^- 

Which of the following is a heme iron protein?

1. Rubredoxin

2. Transferrin

3. Hemerythrin

4. Cytochrome c

Which of the following metalloproteins does not have iron in the active site?

1. Hemoglobin

2. Hemerythrin

3. Hemocyanin

4. Cytochrome c

Hemerythrin belongs to the group of

1. Non-heme iron protein

2. Binuclear copper protein

3. Heme-iron protein

4. None of these.