Q. No.The component of the 30S small subunit of a prokaryotic ribosome that binds to the Shine-Dalgarno sequence is:
1. 5 S
2. 16 S
3. 23 S
4. 28 s
In which of the following bacterial cells will the flagellar insertion be termed as lophotrichous ?
1. 
2. 
3. 
4. 
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 | 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 |
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
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 |
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as :
1. Microtubules
2. Microfilaments
3. Intermediate filaments
4. Lamins
The stain used to visualise mitochondria is
1. Fast green
2. Safranin
3. Acetocarmine
4. Janus green
Consider the given two statements:
I. Even though mitochondria possess ribosomes similar to the bacterial ones, mitochondria are not affected by the antibiotics that affect bacteria
II. Oxygen in mitochondria inactivates these antibiotic molecules
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
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