Q. No.The given diagram shows the ultra-structure of:
1. Centriole
2. Cilium
3. Flagellum
4. Centrosome
2. Cilium
3. Flagellum
4. Centrosome
Both mature erythrocytes of humans and mature sieve tube cells of vascular plants:
1. are involved in transport of respiratory gases
2. lack a nucleus
3. continue to divide in an adult organism
4. do not exhibit any metabolism
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Identify the incorrect statement regarding nucleolus:
| 1. | Their content is continuous with nucleoplasm |
| 2. | It is site for active rRNA synthesis |
| 3. | Their number is always one per nucleus |
| 4. | Larger nucleoli are present in cells actively carrying out protein synthesis |
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Nucleoprotein fibers in the interphase nucleus called chromatin contain all the following except:
| 1. | DNA | 2. | Basic histones |
| 3. | RNA | 4. | Acidic histones |
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When the centromere in a chromosome is located close to its end, the chromosome is called as:
| 1. | Metacentric | 2. | Sub-metacentric |
| 3. | Acrocentric | 4. | Telocentric |
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The number of correct statements amongst the given statements would be:
| I: | The outer nuclear membrane is usually continuous with ER and also bears ribosomes |
| II: | Nuclear pores allow movement of RNA and proteins in both directions between nucleus and cytoplasm |
| III: | Satellite chromosomes have non-staining secondary constrictions at constant locations |
| IV: | Microbodies are membrane bound vesicles containing various enzymes and are present in both plant and animal cells |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
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The triple helix structure of collagen was discovered by:
1. G. N. Ramachandran
2. Y. S. Subbarao
3. C. V. Raman
4. S. Chandrashekhar
Consider the following two statements regarding enzyme action:
I. Co-factors play a crucial role in the catalytic activity of the enzyme.
II. Catalytic activity is reduced when the co-factor is removed from the enzyme.
Of the above statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Enzymes, vitamins and hormones are common in :
1. Being proteinaceous
2. Being synthesized in the body of organisms
3. Enhancing oxidative metabolism
4. Regulating metabolism
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