What do you mean by obligate aerobic bacteria?
Important Questions on Living World
Statement In ciliates, conjugation restores the vigour and vitality which are lost due to chromosomal imbalance in the macronuclei due to repeated amitotic divisions.
Reason Conjugation is temporary union of senile ciliates belonging to same mating types. It often prevents exchange of nuclear material.
Find out the correct combination based on the methods of genetic material exchange which occur in bacteria.
| A) | F-plasmid passes from donor cell to recipient cell | Retaining of the copy of genetic material by the donor |
| B) | Uptake of DNA fragments from the surrounding environment | Acquiring new characters by the recipient cell |
| C) | Production of genetically identical cells | Transformation |
| D) | Transfer of genetic material through bacteriophages | Transduction |
Plasmids have the following characters.
i) They contain fewer genes than the bacterial chromosome.
ii) They have single stranded DNA
iii) They can be used as vectors
iv) They contain linear form of DNA
v) Plasmids confer protection to drugs
The correct combination is
Fill in the blank with the correct option given in the bracket.
Archaebacteria are known as _____ (heterotrophic organisms/living fossils/coelomic organisms).
