Which statement is correct for bacterial transduction?
1. Transfer of some genes from one bacteria to another bacteria through virus
2. Transfer of genes from one bacteria to other bacteria by conjugation
3. Bacteria obtain DNA directly
4. Bacteria obtain DNA from other external sources.
Which part of the animal virus is not reproduced in multiple copies?
1. Capsid
2. Proteins
3. Envelops
4. Ribosome
Viroid’s have:
1. ssRNA not enclosed protein coat
2. ssDNA not enclosed by protein coat
3. dsDNA enclosed by protein coat
4. dsRNA enclosed by protein coat
Powdery mildew of wheat is caused by a species of:
1. Puccinia
2. Erysphe
3. Ustilago
4. Albugo
Nucleic acid is absent in:
1. virus
2. viroid
3. prion
4. mycoplasma
In most fungi, the cell wall is chiefly made of:
1. cellulose
2. chitin
3. protein
4. lipid
Heterocysts are present in:
1. Riccia
2. Ulothrix
3. Albugo
4. Nostoc
Viruses that infect bacterial multiplication and cause their lysis, are called:
1. Lysosomes
2. lipolytic
3. lytic
4. lysogenic
1. | A toxic protein that stays inside the bacterial cell |
2. | A toxic protein that is excreted into the medium |
3. | Lipopolysaccharide located on the surface of the bacteria |
4. | None of the above |
1. Bacillarophyceae
2. Xanthophyceae
3. Rhodophyceae
4. Chrysophyceae