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. 

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

1. Hemoglobin

2. Hemerythrin

3. Hemocyanin

4. Cytochrome c

Which of the following is a heme iron protein?

1. Rubredoxin

2. Transferrin

3. Hemerythrin

4. Cytochrome c

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

1. 2e^- 

2. 4e^- 

3. 6e^- 

4. 8e^-