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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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
A non-membrane bound organelle found in all cells is:
1. Centriole
2. Lysosome
3. Vacuole
4. Ribosome
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Spindle fibers are attached to the chromosome in the region of :
1. Centrosome
2. Chromomere
3. Chromonema
4. Kinetochore
Identify the appendage present on the surface of some bacterial cells that help attach them to rocks in streams and also to the host tissues:
1. Flagella
2. Pili
3. Fimbriae
4. Cilia
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