Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Which of these structures is found in some prokaryotes but NOT in all?
Ribosomes
Cell wall
Plasma membrane
Plasmids
The small, circular DNA molecules often found in prokaryotes in addition to their main chromosome are called:
Plasmids
Ribosomes
Lysosomes
Mesosomes
The production of human insulin in bacteria involves the insertion of the human gene for insulin into a bacterial plasmid. This plasmid then acts as a:
Vector
Promoter
Operator
Repressor
Which of the following statements is FALSE regarding plasmids?
They are self-replicating.
They can carry genes for antibiotic resistance.
They are always integrated into the bacterial chromosome.
They are extrachromosomal DNA molecules.
Plasmids are crucial in genetic engineering. Which property of plasmids makes them particularly useful for this purpose?
Circular structure
Presence within the nucleus
Self-replication
Large size
Unlike the bacterial chromosome, plasmids typically:
Are linear DNA molecules.
Contain genes for essential metabolic processes.
Are not essential for basic cellular functions.
Replicate only during cell division.
Which of these is NOT a typical characteristic of a plasmid?
Independent replication
Circular structure
Encoding essential genes for basic cellular functions
Carrying genes for antibiotic resistance
The latest view for the origin of viruses is
These have arisen from nucleic acid and protein found in primitive soup
These arose from some bacteria as a result of the loss of cell wall, ribosome, etc
These arose from some bacteria, which had developed a nucleus only
These are modified plasmids, which are infact the fragments of the nucleic acids of the host
