Q. No.In the given diagram, the plasma membrane, primary cell wall, secondary cell wall and the middle lamella are shown respectively by:
1. D, B, C and A
2. D, C, B and A
3. D, A, B and C
4. A, B, C and D
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The functions of Smooth Endoplasmic Reticulum in human cells do not include:
1. Protein synthesis
2. Detoxification
3. Production of steroid hormones
4. Storage of calcium ions
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Consider the given two statements:
| I: | Several antibiotics (notably the penicillins and cephalosporins) stop bacterial infections by interfering with cell wall synthesis |
| II: | Such antibiotics have no effects on human cells which have no cell wall, only a cell membrane |
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 and II is incorrect
4. Both I and II are incorrect
Consider the following two statements:
| I: | Secondary constrictions can be used as markers to identify the particular SAT chromosomes. |
| II: | The secondary constrictions are always constant in their positions. |
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 and II is incorrect
4. Both I and II are incorrect
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Most bacteria contain plasmids that often encode for traits that are:
1. advantageous but not essential to their bacterial host
2. advantageous and essential to their bacterial host
3. not advantageous but essential to their bacterial host
4. neither advantageous nor essential to their bacterial host
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Consider the given two statements:
| I: | Chloroplasts are considered endosymbiotic Cyanobacteria. |
| II: | Cyanobacteria consist of free-living photosynthetic bacteria. |
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 and II is incorrect
4. Both I and II are incorrect
Mannans, Xylans, Alginic acid and sulfonated polysaccharides are seen in the cell walls of:
| 1. Algae | 2. Archaebacteria |
| 3. Fungi | 4. Plants |
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Mesosomes, extensions of plasma membrane into the cell, help bacterium in all the following processes except:
| 1. | Photosynthesis in cyanobacteria | 2. | Respiration |
| 3. | DNA replication | 4. | Cell wall formation |
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Scientists think that mitochondria may have once been separate living organisms for all of the following reasons except that they
1. have cilia and flagella
2. have their own DNA
3. can reproduce
4. can produce their own proteins
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The component molecules of the cell membrane have two main parts, the head and the tail. These parts are either hydrophobic (repelled by water) or hydrophilic (attracted to water). Which is which?
| 1. | Hydrophilic Head and Hydrophobic Tail |
| 2. | Both Hydrophobic |
| 3. | Hydrophilic Tail and Hydrophobic Head |
| 4. | Both Hydrophilic |
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