Most Important Questions of Bioinorganic Chemistry (Download PDF)!

By Renuka Miglani|Updated : August 23rd, 2021

Hi Gradians,

It will not be a new thing for you if we say that Gradeup is considered as the synonym for success. For the past 5 years, At BYJU'S Exam Prep we have been promoting talented candidates of the CSIR-NET category to the path of success. BYJU'S Exam Prep has been an integral part of the preparation journey of many Aspirants.

As we all know, the CSIR-NET exam is very near and there is no time left for revision. At this point of time, you must be seeking some ready-made authentic short revision notes or some important questions to practice just before the exam. How will you react if you get all these study materials at one place? It will be beneficial for you at this time right! We at BYJU'S Exam Prep comes up with the Most Important Questions of Bioinorganic Chemistry for Chemical Sciences to help you score good marks which have been meticulously designed by our experienced subject-matter experts.

So what are you waiting for? Scroll down the article below and start study for the CSIR NET Exam, these questions will be fruitful during last-minute revision to fetch more marks in the exams. Students can also download it as a PDF file and save it for future purposes.

We have been providing short study notes for the Chemical Science subject which can be checked here. We have experienced immense love and support from all of you through these short notes in the CSIR-NET category, and we hope you all continue to support us in the same way!

Hi Gradians,

It will not be a new thing for you if we say that Gradeup is considered as the synonym for success. For the past 5 years, At BYJU'S Exam Prep we have been promoting talented candidates of the CSIR-NET category to the path of success. BYJU'S Exam Prep has been an integral part of the preparation journey of many Aspirants.

As we all know, the CSIR-NET exam is very near and there is no time left for revision. At this point of time, you must be seeking some ready-made authentic short revision notes or some important questions to practice just before the exam. How will you react if you get all these study materials at one place? It will be beneficial for you at this time right! We at BYJU'S Exam Prep comes up with the Most Important Questions of Bioinorganic Chemistry for Chemical Sciences to help you score good marks which have been meticulously designed by our experienced subject-matter experts.

So what are you waiting for? Scroll down the article below and start study for the CSIR NET Exam, these questions will be fruitful during last-minute revision to fetch more marks in the exams. Students can also download it as a PDF file and save it for future purposes.

We have been providing short study notes for the Chemical Science subject which can be checked here. We have experienced immense love and support from all of you through these short notes in the CSIR-NET category, and we hope you all continue to support us in the same way!

Bioinorganic Chemistry - Most Important Questions! (Download PDF)

 

1.  In deoxyhaemoglobin

  1. 5th position is coordinated with O2
  2. 5th position is coordinated by porphyrin ring N-atom
  3. 5th position is occupied by N-atom of imidazole ligand of a histidine residue which couples’ heme to the protein
  4. None of the above

2. O2 binding in Hb is

  1. pH-dependent
  2. pH-independent
  3. O2 binds at neutral pH
  4. None of these

3. Release of O2 from oxyhemoglobin is favoured by:

  1. high pH and low CO2 conc
  2. low pH and low CO2 conc
  3. high pH and high CO2 conc
  4. low pH and high conc. of  CO2

4. Hemerythrin belongs to the group of

  1. Non-heme iron protein
  2. Binuclear copper protein
  3. Heme-iron protein
  4. Non-heme-iron protein

5. In oxy-haemoglobin, the iron centre is best described by which of the following?

  1. high-spin Fe(III)
  2. high-spin Fe(II)
  3. low-spin Fe(III)
  4. low-spin Fe(II)

6. Oxymyoglobin Mb(O2) is

  1. Paramagnetic 
  2. Diamagnetic
  3. Antiferromagnetic
  4. None of the above

7. The oxidation state of iron in methemoglobin is

  1. 3
  2. 2
  3. 4
  4. 0

8. The ligand system in vitamin B12 is:

  1. Pyrrole
  2. Corrin
  3. Porphyrin
  4. Phthalocyanine

9. Superoxide dismutase contains:

  1. Zn(II) and Ni(II)
  2. Cu(II) and Fe(II)
  3. Ni(II) and Co(II)
  4. Cu(II) and Zn(II)

10. What is the correct order of binding ability of zinc in carbonic anhydrase metalloenzyme towards halide ions?

  1. I->Br->Cl->F-
  2. F->Br->Cl->I-
  3. I->Cl->Br->F-
  4. F->Cl->Br->I-

Solutions

Solution 1: 

The structure of deoxyhemoglobin is:

According to the structure, C is the correct option.

Solution 2: 

In Haemoglobin, oxygen binding affinity is inversely related to both acidity and the concentration of carbon dioxide. An increase in pH takes place as carbon dioxide decreases which result in haemoglobin picking up more oxygen.

Solution 3: 

The effect of carbon dioxide and acidity favours the formation of oxyhaemoglobin at low concentrations of CO2 and H+ ion which results in the dissociation of oxyhaemoglobin releasing O2 at a high concentration of both CO2 and H+ ion.

Solution 4: 

Hemerythrin is a non-heme protein that is used by two phyla of marine invertebrates for oxygen transport and for storage.

Solution 5: 

The active site of a protein contains a heme group which is coordinated with iron in a 6-coordinate, low spin state. A histidine and a cysteine are involved in axial coordination to the iron.

Solution 6: 

Oxymyoglobin has a zero magnetic moment which means it has no unpaired electrons. Each iron atom is attached with four porphyrin N atoms, the globin molecule, and the oxygen molecule through covalent bonds.

 

Solution 7:

The formation of methemoglobin takes place by the reversible oxidation of heme iron to the ferric state that is Fe3+. Met haemoglobin cannot carry oxygen as oxidized iron cannot bind it.

Solution 8:

Vitamin B12 is generally a collection of cobalt and corrin ring molecules. Corrin rings are like porphyrin rings. Out of the six coordinating sites, four of the ring coordinating sites are provided by corrin rings and fifth one is by dimethyl benzimidazole group. The sixth site which is the centre of reactivity is variable.

Solution 9:

Based on protein fold and metal cofactor, there are three major classes of superoxide dismutase, and these are:

Cu/Zn type

Fe-Mn type

Ni type

 

Solution 10:

HSAB principle: According to this principle, hard acid tends to react with hard base while soft acid tends to react with soft base. The order of binding capability of Zn2+ with halide ions is F->Cl->Br->I- but in carbonic anhydrase enzyme, the order is reversed to I->Br->Cl->F- . Reason for the inversion is the presence of apoenzyme.

As Zn2+ belongs to category of borderline acids so, it tends to react with strong or borderline bases strongly in accordance with HSAB principle, but the presence of apoenzyme in the carbonic anhydrase enzyme makes the Zn as soft acid so, now Zn tends to bind strongly with weak base that is I- followed by Br-, Cl- and finally least binding with F-. So, the order of binding ability with Zn in carbonic anhydrase enzyme is:

 I->Br->Cl->F-

 

Answer Key:

  1. C
  2. A
  3. D
  4. A
  5. C
  6. B
  7. A
  8. B
  9. D
  10. A

Download Important Questions on Bioinorganic Chemistry - Download PDF Here

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Posted by:

Renuka MiglaniRenuka MiglaniMember since Jan 2021
This article was curated by Renuka Miglani who is an Associate Manager at BYJU'S Exam Prep (CSIR-NET). A PostGrad with an educational background in Nutrition Science, she is an ardent reader & writer. Loves to impart knowledge to students. Being from a Nutrition Science background, she is well aware of the opportunities available and has hared the same in the above article. Stay tuned for more interesting articles from her which will be beneficial for your career.
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