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Functions of Plasmids in Bacteria

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Questions and Answers

What is the genetic material contained in bacterial cells?

A single, long molecule of double-stranded DNA (correct)

A multilaminated membranous body formed as invagination of the plasma membrane

A closed circular thread about 1 mm long

A haploid chromosome replicating through mitosis

What is the function of plasmids in bacteria?

To create a nuclear membrane similar to eukaryotic cells

To form the genetic material of bacterial cells

To confer certain properties such as drug resistance and bacteriocin production (correct)

To initiate mitosis in bacterial cells

How do plasmids replicate in bacterial cells?

By forming nuclear membrane and nucleolus

By forming a closed circular thread about 1 mm long

Independently of the chromosome or by integration with it (correct)

Through simple fission instead of mitosis

What are mesosomes (chondroids) in bacterial cells?

Complex or multilaminated membranous bodies formed as invaginations of the plasma membrane into the cytoplasm Signup and view all the answers

What is the function of mesosomes (chondroids) in bacterial cells?

Unclear, but they are involved in various cellular activities such as cell division and respiration Signup and view all the answers

How do plasmids pass on to progeny in bacterial cells?

Through conjugation or the agency of bacteriophages Signup and view all the answers

What is the function of fimbriae or pili in gram-negative bacteria?

Protect the bacterium from phagocytosis Signup and view all the answers

What is the function of capsules in bacteria?

Protect the bacterium from phagocytosis Signup and view all the answers

Where do mesosomes develop in gram-positive bacteria?

Sites of cross-wall formation Signup and view all the answers

Which structure is the location for all bacterial protein synthesis?

Ribosomes Signup and view all the answers

What is the function of gas vesicles in bacteria?

Store gases to provide buoyancy Signup and view all the answers

What are the hair-like surface appendages found in many gram-negative bacteria?

Fimbriae or pili Signup and view all the answers

What is the function of flagella in motile bacteria?

Facilitate bacterial mobility Signup and view all the answers

Where is the single circular chromosome of deoxyribonucleic acid (DNA) located in bacterial cells?

In the cytoplasm Signup and view all the answers

Which structure protects the cell wall of bacteria from attack by antibacterial agents?

Capsules Signup and view all the answers

What is predominantly found in the cytoplasmic region of a well-studied bacterium?