Which of the following statements are correct with reference to packaging of DNA helix?
Choose the correct answer from the options given below:
1. B, D and E only
2. A, B and D only
3. C, D and E only
4. A, C and E only
| A. | Histones are organized to form a unit of eight molecules called histone octamer. |
| B. | Histones are negatively charged basic proteins. |
| C. | Histones are rich in the basic amino acid residues - lysine and arginine. |
| D. | The positively charged DNA is wrapped around the histone octamer to form nucleosome. |
| E. | The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. |
Choose the correct answer from the options given below:
1. B, D and E only
2. A, B and D only
3. C, D and E only
4. A, C and E only
Level 4: Below 35%
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Match List I wit List II:
Choose the correct answer from the options given below:
| List I (Placentation) |
List II (Example) |
||
| A. | Marginal | I. | Mustard |
| B. | Axile | II. | Pea |
| C. | Parietal | III. | Marigold |
| D. | Basal | IV. | Lemon |
Choose the correct answer from the options given below:
| 1. | A-II, B-IV, C-I, D-III |
| 2. | A-IV, B-II, C-I, D-III |
| 3. | A-III, B-I, C-IV, D-II |
| 4. | A-I, B-III, C-II, D-IV |
Level 4: Below 35%
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Which one of the following is the site for active ribosomal RNA synthesis?
| 1. | Nuclcouls | 2. | Kinetochore |
| 3. | Centrosome | 4. | Chromatin |
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The main function of bulliform cells in grasses is:
| 1. | to perform photosynthesis. |
| 2. | to minimize water loss during water stress. |
| 3. | to make the leaf impermeable to fungal spores. |
| 4. | to transport water. |
Level 4: Below 35%
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Which of the following statements are correct ?
Choose the correct answer from the options given below
| A. | The Amazon rainforest being cut and cleared for cultivation of soyabeans is an example of habitat loss. |
| B. | Steller's sea cow and passenger pigeon >became extinct due to over-exploitation by humans. |
| C. | The Nile perch introduced into Lake Victoria in East Africa helped in population growth of cichlid fish in the lake. |
| D. | water hyacinth is an invasivespecies. |
| E. | When a species becomes extinct, the plant and animal species associated with it are not affected. |
Choose the correct answer from the options given below
| 1. | A, B and D only |
| 2. | B, C and D only |
| 3. | A, B and E only |
| 4. | C, D and E only |
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Which one of the following statements is not true about the universal rules of binomial nomenclature?
| 1. | The first word in the biological name represents the specific epithet, while the second component denotes the genus. |
| 2. | The specific epithet in the biological name starts with a small letter. |
| 3. | Both the words in a biological name, when handwritten, are separately underlined or printed in italics |
| 4. | Biological names are generally in Latin. |
Level 4: Below 35%
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Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?
1. Phenylketonuria
2. Haemophilia
3. Sickle-cell anaemia
4. Thalassemia
1. Phenylketonuria
2. Haemophilia
3. Sickle-cell anaemia
4. Thalassemia
Level 4: Below 35%
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Find the incorrect statement(s) about photosynthesis from the following:
Choose the answer from the options given below:
| A. | The water splitting complex is associated with PS I. |
| B. | \(C_4\) plants use the \(C_3\) pathway of \(CO_2\) fixation as the main biosynthetic pathway. |
| C. | In \(C_4\) plants, photorespiration does not occur. |
| D. | \(C_3\) plants exhibit ‘Kranz’ anatomy. |
| E. | ATP synthesis in chloroplast occurs through chemiosmosis. |
Choose the answer from the options given below:
| 1. | B and C only | 2. | B and E only |
| 3. | B only | 4. | A and D only |
Level 4: Below 35%
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Match List I with List II:
Options:
1. A-III, B-IV, C-II, D-I
2. A-I, B-II, C-III, D-IV
3. A-III, B-II, C-IV, D-I
4. A-IV, B-III, C-II, D-I
| List-I | List-II | ||
| A. | Trypsin | I. | Intercellular ground substance |
| B | Morphine | II. | Lectin |
| C | Concanavalin | III. | Enzyme |
| D | Collagen | IV. | Alkaloid |
Options:
1. A-III, B-IV, C-II, D-I
2. A-I, B-II, C-III, D-IV
3. A-III, B-II, C-IV, D-I
4. A-IV, B-III, C-II, D-I
Level 4: Below 35%
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Identify the correct statements about biomolecules.
Choose the correct answer from the options given below:
| A. | Lipids are generally water-soluble. |
| B. | Proteins are polypeptides |
| C. | Polysaccharides are long chains of sugars. |
| D. | Adenine and guanine are substituted pyrimidines. |
| E. | Almost all enzymes are proteins. |
Choose the correct answer from the options given below:
| 1. | A, B and C only |
| 2. | B, D and E only |
| 3. | B, C and E only |
| 4. | C, D and E only |
Level 4: Below 35%
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