Which of the following statements are correct with reference to packaging of DNA helix ?
Choose the correct answer from the options given below:
1. A, B and D only
2. B, D and E only
3. A, C and E only
4. C, D 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. A, B and D only
2. B, D and E only
3. A, C and E only
4. C, D and E only
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Which of the following statements are correct with respect to DNA separation, isolation and visualization?
Choose the correct answer from the options given below:
1. B and C only
2. B and D only
3. A and B only
4. A and D only
| A. | The cutting of DNA is done by molecular scissors. |
| B. | The DNA fragments separate according to their size in an agarose gel, upon electrophoresis. |
| C. | The separated DNA fragments can be seen without staining when exposed to UV light. |
| D. | The separated DNA fragments, when stained with ethidium bromide, can be seen in visible light. |
Choose the correct answer from the options given below:
1. B and C only
2. B and D only
3. A and B only
4. A and D only
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Alpha-helix is found in which level of protein structure?
1. Tertiary structure
2. Quaternary structure
3. Secondary structure
4. Primary structure
1. Tertiary structure
2. Quaternary structure
3. Secondary structure
4. Primary structure
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Match List I with List II:
Choose the correct answer from the options given below.
| List-I | List-II | ||
| A. | Productivity | I. | Cross primary productivity minus respiration loss |
| B. | Net primary productivity | II. | Rate of formation of new organic matter by consumers |
| C. | Cross primary productivity | III. | Rate of biomass production |
| D. | Secondary productivity | IV. | Rate of production of organic matter during photosynthesis |
Choose the correct answer from the options given below.
| 1. | A-III, B-I, C-IV, D-II |
| 2. | A-I, B-II, C-III, D-IV |
| 3. | A-III, B-I, C-II, D-IV |
| 4. | A-I, B-III, C-IV, D-II |
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Match List I wit List II:
Choose the correct answer from the options given below:
1. A-I, B-III, C-II, D-IV
2. A-IV, B-II, C-I, D-III
3. A-II, B-IV, C-I, D-III
4. A-III, B-I, C-IV, D-II
| List I | List II | ||
| (Placentation) | (Example) | ||
| A. | Marginal | I. | Mustard |
| B. | Axile | II. | Pea |
| C. | Parietal | III. | Marigold |
| D. | Basal | IV. | Lemon |
1. A-I, B-III, C-II, D-IV
2. A-IV, B-II, C-I, D-III
3. A-II, B-IV, C-I, D-III
4. A-III, B-I, C-IV, D-II
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Choose the correct statements regarding frog's anatomy :
Choose the correct answer from the options given below :
1. B and D only
2. A, B and C only
3. A, C and E only
4. B and C only
| A. | Hepatic portal system is the special venous connection between liver and intestine. |
| B. | There are twelve pairs of cranial nerves arising from the brain. |
| C. | The ureters and oviducts open separately into the cloaca in female frogs. |
| D. | Hind-brain consists of cerebellum, medulla oblongata and optic lobes. |
| E. | Sinus venosus joins the right atrium of heart. |
Choose the correct answer from the options given below :
1. B and D only
2. A, B and C only
3. A, C and E only
4. B and C only
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The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as :
| 1. | Aptenodytes | 2. | Neophron |
| 3. | Psittacula | 4. | Struthio |
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Male frogs can be distinguished from female frogs due to the presence of:
Choose the correct answer from the options given below :
1. B and D only
2. B and C only
3. A and B only
4. C and E only
| A. | Bulging eyes |
| B. | Vocal sacs |
| C. | Webbed digits in feet |
| D. | Copulatory pad on first digit of fore limbs |
| E. | Olive green-coloured skin with dark irregular spots |
Choose the correct answer from the options given below :
1. B and D only
2. B and C only
3. A and B only
4. C and E only
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A group of researchers procured some fish-like animals and upon investigation the following characters were observed :
Which of the following species of animals did they consider to fit best with these characters ?
1. Petromyzon sp.
2. Branchiostoma sp.
3. Scoliodon sp.
4. Exocoetus sp.
| A. | Endoskeleton was made of cartilage. |
| B. | Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth. |
| C. | Paired fins and scales were absent, but 7 pairs of gill slits were present. |
Which of the following species of animals did they consider to fit best with these characters ?
1. Petromyzon sp.
2. Branchiostoma sp.
3. Scoliodon sp.
4. Exocoetus sp.
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In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
Choose the correct answer from the options given below:
1. A, B, C, D, E
2. E, A, C, D, B
3. C, B, E, A, D
4. C, A, B, E, D
| A. | Diffusion of \(O_2\) and \(CO_2\) between blood and tissues |
| B. | Diffusion of \(O_2\) and \(CO_2\) across alveolar membrane |
| C. | Pulmonary ventilation by which atmospheric air is drawn in and \(CO_2\) rich alveolar air is released out |
| D. | Cellular respiration |
| E. | Transport of gases by the blood |
Choose the correct answer from the options given below:
1. A, B, C, D, E
2. E, A, C, D, B
3. C, B, E, A, D
4. C, A, B, E, D
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