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Q. No.The correct statement about the secondary structure of DNA/RNA is :
| 1. | DNA possesses a single-stranded helix structure and contains uracil as one of the four bases. |
| 2. | RNA possesses a single-stranded helix structure and contains thymine as one of the four bases. |
| 3. | DNA possesses a double-stranded helix structure and contains thymine as one of the four bases. |
| 4. | RNA possesses a double-stranded helix structure and contains uracil as one of the four bases. |
Subtopic: DNA, RNA & Metal Ions |
84%
Level 1: 80%+
NEET - 2026
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The correct statement about peptides and proteins is :
| 1. | In \(\alpha\)-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds. |
| 2. | Tertiary structure of proteins has two or more polypeptide subunits. |
| 3. | Only the proteins having a quaternary structure are biologically active. |
| 4. | In \(\beta\)-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds. |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
69%
Level 2: 60%+
NEET - 2026
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The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is:
| 1. | serine | 2. | leucine |
| 3. | threonine | 4. | methionine |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
58%
Level 3: 35%-60%
NEET - 2026
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Match the vitamins in List I with their sources in List II
Choose the correct answer from the options given below.
| List I | List II | |
| A. | vitamin | meat |
| B. | vitamin B12 | sunflower oil |
| C. | vitamin E | green leafy vegetables |
| D. | vitamin K | carrots |
Choose the correct answer from the options given below.
| 1. | A-III, B-I, C-IV, D-II |
| 2. | A-II, B-III, C-IV, D-I |
| 3. | A-IV, B-I, C-II, D-III |
| 4. | A-IV, B-II, C-I, D-III |
Subtopic: Vitamins, Hormones & Enzymes |
75%
Level 2: 60%+
NEET - 2026
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If a Sugar ' X ' is found in honey, is a keto sugar, exists in \(\alpha\) and \(\beta\) - anomeric forms and is laevorotatory, then find out 'X':
1. Maltose
2. Sucrose
3. D-Glucose
4. D-Fructose
1. Maltose
2. Sucrose
3. D-Glucose
4. D-Fructose
Subtopic: Carbohydrates - Classification & D-L configuration |
58%
Level 3: 35%-60%
NEET - 2025
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Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I (Name of Vitamin) |
List-II (Deficiency disease) |
||
| A. | Vitamin \(B_{12}\) | I. | Cheilosis |
| B. | Vitamin \(D\) | II. | Convulsions |
| C. | Vitamin \(B_{2}\) | III. | Rickets |
| D. | Vitamin \(B_{6}\) | IV. | Pernicious anaemia |
| 1. | A-II, B-III, C-I, D-IV | 2. | A-IV, B-III, C-II, D-I |
| 3. | A-I, B-III, C-II, D-IV | 4. | A-IV, B-III, C-I, D-II |
Subtopic: Vitamins, Hormones & Enzymes |
60%
Level 2: 60%+
NEET - 2025
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The reagents with which glucose does not react to give the corresponding test/products are:
A. Tollen's reagent
B. Schiff's reagent
C. \(\text{HCN}\)
D. \(\text{NH}_2\text{OH}\)
E. \(\text{NaHSO}_3\)
Choose the correct option:
A. Tollen's reagent
B. Schiff's reagent
C. \(\text{HCN}\)
D. \(\text{NH}_2\text{OH}\)
E. \(\text{NaHSO}_3\)
Choose the correct option:
| 1. | \(\text{A}\) and \(\text{D}\) | 2. | \(\text{B}\) and \(\text{E}\) |
| 3. | \(\text{E}\) and \(\text{D}\) | 4. | \(\text{B}\) and \(\text{C}\) |
Subtopic: Carbohydrates - Classification & D-L configuration |
70%
Level 2: 60%+
NEET - 2024
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Match List-II with List-II :
Choose the correct answer from the options given below:
1. A-I, B-II, C-III, D-IV
2. A-IV, B-III, C-II, D-I
3. A-I, B-IV, C-II, D-III
4. A-IV, B-I, C-II, D-III
| List-I (Vitamins) | List-II (Deficiency/other name/ property) | ||
| A. | Vitamin K | I. | RBC deficient in haemoglobin |
| B. | Vitamin \(\text{B}_{12}\) | II. | Bleeding gums |
| C. | Vitamin C | III. | Thiamine |
| D. | Vitamin \(\text{B}_1\) | IV. | Fat soluble |
1. A-I, B-II, C-III, D-IV
2. A-IV, B-III, C-II, D-I
3. A-I, B-IV, C-II, D-III
4. A-IV, B-I, C-II, D-III
Subtopic: Vitamins, Hormones & Enzymes |
79%
Level 2: 60%+
NEET - 2024
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
| Statement I: | Glycogen is similar to amylose in its structure. |
| Statement II: | Glycogen is found in yeast and fungi also. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Polysaccharides & their Importance |
Level 3: 35%-60%
NEET - 2024
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Given below are two statements:
In the light of the above statements choose the correct answer from the options given below:
| Statement I: | A unit formed by the attachment of a base to 1' position of sugar is known as a nucleoside. |
| Statement II: | When nucleoside is linked to a phosphorous acid at 5' position of sugar moiety, we get nucleotide. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: DNA, RNA & Metal Ions |
Level 4: Below 35%
NEET - 2023
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