Find the well-known naturally occurring organometallic compound from the following options.

1. Vitamin B₁₂ coenzyme

2. Chlorophyll

3. Cytochrome P-450

4. Myoglobin

${\mathrm{VO}}_4^{3-}<mspace\; width="1em"></mspace>\mathrm{or}<mspace\; width="1em"></mspace>{\mathrm{PO}}_4^{3-}$ which inhibits the operation of enzyme ATPase?

1. Both

2. Only ${\mathrm{PO}}_4^{3-}$

3. Only ${\mathrm{VO}}_4^{3-}$

4. None of these

The inside of a cell is a

1. reducing medium

2. oxidising medium

3. neutral medium

4. None of these

O₂ binding in Hb is

1. pH dependent

2. pH independent

3. O₂ binds at neutral pH

4. None of these

Identify the condition that favours the release of O₂ from oxyhaemoglobin.

1. High pH and low CO₂ concentration

2. Low pH and low CO₂ concentration

3. High pH and high CO₂ concentration

4. Low pH and high concentration of CO₂ 

Nitrogenase enzyme contains

1. Fe-S protein

2. Mo-Fe-S protein

3. Both 1 and 2

4. None of the above

The biological role of Cytochrome P-450 is :

1. Nitrogen fixation

2. Oxidation of RH to ROH

3. Amide hydrolysis

4. Oxidation of amino acid.

Myoglobin is a

1. Catalyst for epoxidation reaction

2. Component in a photosynthetic system

3. Nitrogen fixation enzyme

4. Di-oxygen binding metalloprotein

The metal that is not prevalent in the biological system is

1. Platinum

2. Manganese

3. Cobalt

4. Nickel

Hemerythrin belongs to the group of

1. Non-heme iron protein

2. Binuclear copper protein

3. Heme-iron protein

4. None of these.