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Test: Bio Inorganic- 2


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30 Questions MCQ Test Chemistry for GRE Paper II | Test: Bio Inorganic- 2

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Test: Bio Inorganic- 2 - Question 1

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

A (substituents on ring are removed for clarity)

Test: Bio Inorganic- 2 - Question 2

At pH 7, the zinc(II) ion in carbonic anhydrase reacts with CO2 to give:

Test: Bio Inorganic- 2 - Question 3

The cooperative binding Of O2 in hemoglobin is due to:

Test: Bio Inorganic- 2 - Question 4

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

Test: Bio Inorganic- 2 - Question 5

Under physiological condition, oxygen is binding to deoxyhemoglobin and deoxymyoglobin, the binding curve and its pH dependence, respectively, are:

Test: Bio Inorganic- 2 - Question 6

Match the metalloproteins in column A with their function in column B

The correct answer is

Test: Bio Inorganic- 2 - Question 7

The total number of metal ion and the number of coordinated imidazole units of histidine in the active site of oxy-hemocyanin, respectively, are:

Detailed Solution for Test: Bio Inorganic- 2 - Question 7

Test: Bio Inorganic- 2 - Question 8

The changes (from A-D given below) which occur when Obinds to hemerythrin are

(A) One iron atom is oxidized

(B) Both the iron atoms are oxidized

(C) Obinds to one iron atom and is also hydrogen-bonded.

(D) O2 binds to both the iron atoms and is also hydrogen-bonded.

Test: Bio Inorganic- 2 - Question 9

The resonance Raman stetching frequency of (V0-0  in cm-1) of is 1580. The V0-0 for O2 in bound oxy-hemoglobin is close to:

Test: Bio Inorganic- 2 - Question 10

The metal present at the active site of the protein Carboxypept idase A is:

Test: Bio Inorganic- 2 - Question 11

Match the following items of column I with the appropriate items in column II

Test: Bio Inorganic- 2 - Question 12

In biological systems, the metal ion involved in the dioxygen transport besides Fe is:

Test: Bio Inorganic- 2 - Question 13

Iron–sulphur clusters in bio logical systems are involved in:

Test: Bio Inorganic- 2 - Question 14

The amino acid side chain high affinity for Ca2+ and Cu2+ in metallo–proteins is:

Test: Bio Inorganic- 2 - Question 15

When a reduced cytochrome transfers an electron from its Fe(II) to the bound O2:

Test: Bio Inorganic- 2 - Question 16

In photosynthesis, the predominant metal present in the reaction centre of photo –system II is:

Detailed Solution for Test: Bio Inorganic- 2 - Question 16

manganese(Mn)

Metals exert important functions in the chloroplast of plants, where they act as cofactors and catalysts in the photosynthetic electron transport chain. In particular, manganese (Mn) has a key function because of its indispensable role in the water-splitting reaction of photosystem II (PSII).

Test: Bio Inorganic- 2 - Question 17

Zn in carbonic anhydrase is coordinated by three histidine and one water molecule. The reaction of CO2 with this enzyme is an example of:

Detailed Solution for Test: Bio Inorganic- 2 - Question 17

COacts as an electrophile and H2O as a nucleophile which attacks CO2. Hence, electrophilic addition takes place.

Test: Bio Inorganic- 2 - Question 18

In biological systems, the metal ions involved in electron transport are:

Test: Bio Inorganic- 2 - Question 19

In the transformation of oxyhaemoglobin to deoxyhaemoglobin:

Test: Bio Inorganic- 2 - Question 20

Among the following pair of metal ions present in Nature. The first one functions as an electron transfer agent and the second one catalyzes the hydrolysis reactions. The correct pair is:

Test: Bio Inorganic- 2 - Question 21

A well known naturally occurring organometallic compound is:

Test: Bio Inorganic- 2 - Question 22

The red color of oxyhaemoglobin is mainly due to the:

Detailed Solution for Test: Bio Inorganic- 2 - Question 22

Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen i.e. intra ligand  π–π* transition. 

When the iron is oxygenated(Fe+3), it becomes red. When the iron is deoxygenated(Fe+2), it becomes blue. This is why your veins are blue.

Test: Bio Inorganic- 2 - Question 23

Hemoglobin is an oxygen carrying. The correct statement about oxy–hemoglobin is that:

Test: Bio Inorganic- 2 - Question 24

Oxymyoglobin Mb(O2) and oxyhaemoglobin Hb(O2)4, respectively, are:

Test: Bio Inorganic- 2 - Question 25

The number of oxygen molecule(s) that a molecule of hemerythrin can transport is:

Test: Bio Inorganic- 2 - Question 26

Mg2+ is preferred in photosynthesis by chlorophyll because:

Test: Bio Inorganic- 2 - Question 27

Among the given pH values, the O2 binding efficiency of hemoglobin is maximum at:

Test: Bio Inorganic- 2 - Question 28

Identify the function of hemocyanin and the metal responsible for it:

Test: Bio Inorganic- 2 - Question 29

During oxygen transport by hemerythrin, oxygen is bound as:

Detailed Solution for Test: Bio Inorganic- 2 - Question 29

The mechanism of dioxygen binding is unusual. Most O2 carriers operate via formation of dioxygen complexes, but hemerythrin holds the O2 as a hydroperoxide (HO2, or -OOH). The site that binds O2 consists of a pair of iron centres. The iron atoms are bound to the protein through the carboxylate side chains of a glutamate and aspartates as well as through five histidine residues. Hemerythrin and myohemerythrin are often described according to oxidation and ligation states of the iron center:

Fe2+—OH—Fe2+deoxy (reduced)

Fe2+—OH—Fe3+semi-met

Fe3+—O—Fe3+—OOHoxy (oxidized)

Fe3+—OH—Fe3+— (any other ligand)met (oxidized)

The uptake of O2 by hemerythrin is accompanied by two-electron oxidation of the diferrous centre to produce a hydroperoxide (OOH) complex. The binding of O2 is roughly described in this diagram:

 

 

Test: Bio Inorganic- 2 - Question 30

At pH 7.2 and 10 Torr oxygen partial pressure, the extent of O2 binding is:

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