The extent of π 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)(i)>(iii)

Subtopic:  Vitamins, Hormones & Enzymes |
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NEET 2023 - Target Batch - Aryan Raj Singh
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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 FeIII to FeIV.

2. Porphyrin ring is oxidized by one electron.

3. π-π* transition appears in the visible region

4. FeIV is coordinated with anionic tyrosinate ligand in axial position.

Subtopic:  Vitamins, Hormones & Enzymes |
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NEET 2023 - Target Batch - Aryan Raj Singh
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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

Subtopic:  Vitamins, Hormones & Enzymes |
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which is not a macromolecule?

(1) DNA

(2) Starch

(3) Palmitate

(4) Insulin

Subtopic:   DNA, RNA & Metal Ions |
 64%
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NEET 2023 - Target Batch - Aryan Raj Singh
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To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The reaction of concentrated sulphuric acid with carbohydrates (C12H22O11) is an example of

1. Dehydration

2. Oxidation

3. Reduction

4. Sulphonation

Subtopic:  Carbohydrates - Classification & D-L configuration |
 67%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Iron-sulphur clusters in biological systems are involved in

1. proton transfer

2. atom transfer

3. group-transfer

4. e- transfer

Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
 66%
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NEET 2023 - Target Batch - Aryan Raj Singh
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The reduction of nitrogen to ammonia, carried out by the enzyme nitrogenase needs

1. 2e- 

2. 4e- 

3. 6e- 

4. 8e- 

Subtopic:  Vitamins, Hormones & Enzymes |
 51%
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following is a heme iron protein?

1. Rubredoxin

2. Transferrin

3. Hemerythrin

4. Cytochrome c

Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following metalloproteins does not have iron in the active site?

1. Hemoglobin

2. Hemerythrin

3. Hemocyanin

4. Cytochrome c

Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
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NEET 2023 - Target Batch - Aryan Raj Singh
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Hemerythrin belongs to the group of

1. Non-heme iron protein

2. Binuclear copper protein

3. Heme-iron protein

4. None of these. 

Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
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NEET 2023 - Target Batch - Aryan Raj Singh
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