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Q. No.Which of the following monosaccharides are present as five membered cyclic structure (Furanose structure)?
I. Ribose
II. Glucose
III. Fructose
IV. Galactose
1. I and II
2. II and III
3. I and III
4. II and IV
Subtopic: Carbohydrates - Classification & D-L configuration |
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In both DNA and RNA, heterocyclic base and phosphate ester linkages are at:
| 1. | C5' and C1' respectively of the sugar molecule. |
| 2. | C1' and C5' respectively of the sugar molecule. |
| 3. | C2' and C5' respectively of the sugar molecule. |
| 4. | C5' and C2' respectively of the sugar molecule. |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
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Given below are two statements:
| Assertion (A): | Glucose or sucrose are soluble in water but cyclohexane or benzene are insoluble in water. |
| Reason (R): | Glucose and sucrose undergo extensive H-bonding with water while cyclohexane or benzene do not. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Carbohydrates - Classification & D-L configuration |
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Hydrolysis of lactose yields which of the following products?
| 1. | Two molecules of glucose |
| 2. | One molecule of glucose and one molecule of galactose |
| 3. | One molecule of glucose and one molecule of fructose |
| 4. | Two molecules of fructose |
Subtopic: Polysaccharides & their Importance |
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The secondary structure of a protein refers to:
1. α-Helical backbone
2. Hydrophobic interactions
3. Sequence of α-amino acids
4. Fixed configuration of the polypeptide backbone
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
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Which one of the following bases is not present in DNA?
| 1. | Adenine | 2. | Cytosine |
| 3. | Thymine | 4. | Quinoline |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
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Out of the following, which type of interaction is responsible for the stabilisation of -helix structure of proteins?
| 1. | Ionic bonding | 2. | Hydrogen bonding |
| 3. | Covalent bonding | 4. | Vander Waals forces |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
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When glucose is reduced with red phosphorous and HI, then n-hexane is formed. This reaction shows that glucose has:
1. A ring structure
2. A linear chain of six carbon atoms
3. Five -OH groups
4. \(-CHO\) group
1. A ring structure
2. A linear chain of six carbon atoms
3. Five -OH groups
4. \(-CHO\) group
Subtopic: Carbohydrates - Classification & D-L configuration |
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Given below are two statements:
Select the most appropriate answer from the options given below:
| Assertion (A): | Two strands of DNA are complementary to each other. |
| Reason (R): | Adenine specifically forms hydrogen bonds with guanine, whereas cytosine forms hydrogen bonds with thymine. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: DNA, RNA & Metal Ions |
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Subtopic: Vitamins, Hormones & Enzymes |
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