Q. No.
A centriole-like structure, from which the cilium and the flagellum emerge, is the:
1. Centrosome
2. Basal body
3. Axoneme
4. Vimentin
The outer membrane of the nucleus:
I. is continuous with the Endoplasmic reticulum
II. does not bear ribosomes.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
If the centromere is situated close to the end of a chromosome, it is called as:
1. Metacentric
2. Submetacentric
3. Acrocentric
4. Telocentric
Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. This leads us to which of the following as a probable hypothesis?
| 1. | Disruption of one of these types of structure should necessarily disrupt each of the others as well. |
| 2. | Loss of basal bodies should lead to loss of all cilia, flagella, and centrioles. |
| 3. | Motor proteins such as dynein must have evolved before any of these four kinds of structure. |
| 4. | Natural selection for motility must select for microtubular arrays in circular patterns. |
The presence of cholesterol in the plasma membranes of some animals.
| 1. | enables the membrane to stay fluid more easily when cell temperature drops. |
| 2. | enables the animal to remove hydrogen atoms from saturated phospholipids. |
| 3. | enables the animal to add hydrogen atoms to unsaturated phospholipids. |
| 4. | makes the membrane less flexible, allowing it to sustain greater pressure from within the cell. |
Prokaryotic cells have something unique in the form of:
1. Inclusion bodies
2. Plasmids
3. Cell wall
4. 70 S ribosomes
Gas vacuoles allow cyanobacteria to:
| 1. | Store carbon dioxide for assimilation |
| 2. | Control their buoyancy |
| 3. | Provide anaerobic conditions to nitrogenase |
| 4. | Eliminate toxic ammonia |
The lipid component of the plasma membrane mainly consists of:
1. Triglycerides
2. Cholesterol
3. Phosphoglycerides
4 Proteins
Carotenoid pigments are found in:
| I: | Chloroplasts |
| II: | Chromoplasts |
| III: | Leucoplasts |
1. Only I
2. Only I and II
3. Only II
4. I, II and III
Microbodies, which help to convert stored lipids into carbohydrates so they can be used for plant growth, are known as:
1. Peroxisomes
2. Sphaerosomes
3. Glyoxysomes
4. Lysosomes
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