Select the correct match from among the following:
1. Collagen – Intracellular ground substance
2. Toxin – Codeine
3. Lectin – Ricin
4. Alkaloid – Morphine
Subtopic: Primary & Secondary Metabolites |
72%
From NCERT
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Select the incorrect statement among the following:
| 1. | Palmitic acid has 16 carbons including carboxyl carbon. |
| 2. | Lipids are not polymers but they are assembled from smaller molecules by dehydration. |
| 3. | Arachidonic acid has 20 carbon atoms including carboxyl carbon. |
| 4. | Lecithin is an example of phospholipid found in neural tissues but absent in cell membrane. |
Subtopic: Lipids |
82%
From NCERT
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If the enzyme commission number of an enzyme is 2.7.1.1 then it catalyse which of the following reaction?
1. \(\mathrm{AB}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{AH}+\mathrm{BOH}\)
2.
3. \(S-G+S^{\prime} \rightarrow S+S^{\prime}-G\)
4. Alcohol + NAD → Aldehyde + NADH2
1. \(\mathrm{AB}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{AH}+\mathrm{BOH}\)
2.
3. \(S-G+S^{\prime} \rightarrow S+S^{\prime}-G\)
4. Alcohol + NAD → Aldehyde + NADH2
Subtopic: Enzymes Classification |
62%
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Read the given statements and choose the incorrect one:
| 1. | Oils generally have lower melting point than fats. |
| 2. | Percentage of total cellular mass of carbohydrates is higher than that of nucleic acids. |
| 3. | Relative abundance of carbon and hydrogen with respect to other elements is higher in any living organism than in the earth’s crust. |
| 4. | Abrin and ricin are toxins. |
Subtopic: Introduction | Lipids: Fatty Acids | Primary & Secondary Metabolites |
76%
From NCERT
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B-DNA is the most common form of DNA having all the following salient features except
| 1. | The pitch would be 34 Å |
| 2. | The strand turns 36° at each step of ascent |
| 3. | The rise per base pair is 3.6 Å |
| 4. | One full turn of helical strand involves 10 base pairs |
Subtopic: Nucleic Acid | The DNA |
67%
From NCERT
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Match column I with column II and select the correct option.
1. a(ii), b(iii), c(iv), d(i)
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
| Column I | Column II | ||
| a. | Phosphate and hydroxyl group of sugar in a nucleotide | (i) | Peptide bond |
| b. | Polymer of amino acids | (ii) | Glycosidic bond |
| c. | Polysaccharides | (iii) | Hydrogen bond |
| d. | Adenine and thymine in a DNA | (iv) | Ester bond |
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
Subtopic: The DNA | Amino Acids | Zwitter ion & Peptide Bond | Carbohydrates: Glycosidic Bond & Disaccharide |
87%
From NCERT
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Read the statements A and B carefully and select the correct answer.
| Statement A: | Enzyme-substrate complex produced during a catalysed reaction is highly reactive. |
| Statement B: | This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product complex. |
| 1. | Both statements A and B are correct |
| 2. | Both statements A and B are incorrect |
| 3. | Only statement A is correct |
| 4. | Only statement A is incorrect |
Subtopic: Enzymes | Enzyme Catalysis |
From NCERT
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NEET 2026 - Target Batch - Vital
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Subtopic: Nucleic Acid: Nucleotides |
62%
From NCERT
NEET - 2013
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
Which of the following statements about enzymes is wrong?
| 1. | Enzymes are denatured at high temperatures |
| 2. | Enzymes are mostly proteins but some are lipids also |
| 3. | Enzymes are highly specific. |
| 4. | Enzymes require optimum pH and temperature for maximum activity. |
Subtopic: Enzymes |
85%
From NCERT
NEET - 2013
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital
The manner in which the individual folded polypeptides or subunits are arranged with respect to each other is the architecture of a protein otherwise called the:
| 1. | primary structure of a protein |
| 2. | secondary structure of a protein |
| 3. | tertiary structure of a protein |
| 4. | quaternary structure of a protein |
Subtopic: Proteins |
53%
From NCERT
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