Q. No.If a species of bacteria has multiple strains but only some are pathogenic, it is likely that unlike the non-pathogenic strains, the pathogenic strains will have:
1. Plasmids
2. Lipopolysaccharide
3. Pili
4. Flagellum
1. Plasmids
2. Lipopolysaccharide
3. Pili
4. Flagellum
A genophore is the DNA of a prokaryote. Though it is commonly referred to as a prokaryotic chromosome, the term “chromosome” is misleading, because:
| 1. | the genophore lacks chromatin |
| 2. | the genophore is circular rather than linear |
| 3. | the genophore replicates without telomeres |
| 4. | the genophore is not enclosed in a nuclear membrane |
Consider the given two statements:
| Statements I | Carboxysomes are thought to have evolved as a consequence of the increase in oxygen concentration in the ancient atmosphere |
| Statements II | Oxygen is a competing substrate to carbon dioxide in the RuBisCO reaction |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
Cytoskeleton elements involved in intracellular transport, the formation of the axoneme of cilia and flagella and the mitotic spindle, are:
1. Microfilaments
2. Intermediate filaments
3. Microtubules
4. FTS-Z
Consider the given two statements:
| Statement- I | Lugol's iodine solution is always added after addition of crystal violet in Gram staining. |
| Statement- II | Lugol’s iodine helps in counter-staining, if required. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
Cytoskeleton elements involved in muscle contraction, cytokinesis and cytoplasmic streaming are:
1. Microfilaments
2. Intermediate filaments
3. Microtubules
4. FTS-Z
Consider the given two statements:
| Statement I | Only eukaryotes have cytoskeleton components. |
| Statement II | The cell wall is the only deciding factor for many bacterial cell shapes. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and 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 given two statements
| statement- I | Placing phospholipids into an aqueous solution immediately results in their forming a lipid bilayer. |
| statement- II | Phospholipids have a strong affinity for other phospholipids, leading to self assembly by covalent bonding. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
Identify the incorrect statement regarding endospores in bacteria:
| 1. | An endospore is a dormant, tough, and non-reproductive structure produced by some bacteria and archaea. |
| 2. | Endospore formation is usually triggered by a lack of nutrients, and usually occurs in gram-positive bacteria. |
| 3. | The endospore consists of the bacterium's DNA, ribosomes and large amounts of dipicolinic acid. |
| 4. | When favorable conditions return, a large number of cells are produced as a result of endospore germination. |
Consider the given two statements:
| Statement I | In plants the glyoxylate cycle occurs in special peroxisomes which are called glyoxysomes. |
| Statement II | This cycle allows seeds to use lipids as a source of energy to form the shoot during germination. |
| 1. | Both I and II are correct and II explains II |
| 2. | Both I and 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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