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Questions and Answers

What is the time required for microbial cells to double in number?

Generation time (correct)

Replication time

Enlargement time

Cell division time

What protein binds to the origin of replication (oriC) and initiates bidirectional DNA synthesis in bacteria?

DnaB

DnaA (correct)

SeqA

DnaG

What prevents additional rounds of replication by blocking DnaA from binding to the oriC region?

SeqA binding to hemimethylated DNA (correct)

DnaB binding to oriC

DnaA binding to fully methylated DNA

RNA polymerase binding to oriC

What do fast-growing cells with generation times less than the replication time contain?

Multiple replication forks Signup and view all the answers

What is the major shape-determining factor in bacteria?

MreB Signup and view all the answers

What is the function of the Par system and PopZ in bacteria?

Distribute chromosomes and plasmids equally Signup and view all the answers

What is the role of Min proteins in bacterial cell division?

Ensure the divisome forms at the center of the cell Signup and view all the answers

What is a major feature of cell division in bacteria?

Peptidoglycan biosynthesis Signup and view all the answers

What is the function of bactoprenol in bacterial cell division?

Carries peptidoglycan precursors through the cytoplasmic membrane Signup and view all the answers

What triggers biofilm formation in Vibrio cholerae?

Low cell densities Signup and view all the answers

What is the role of cyclic di-GMP signaling in biofilm formation?

Triggers biofilm formation Signup and view all the answers

What is the function of Fts proteins in bacterial cell division?

Essential for binary fission Signup and view all the answers

What is the function of PopZ in bacterial cell division?

Recruit proteins involved in cell wall growth Signup and view all the answers

What is the function of the divisome in bacterial cell division?

Synthesize new cytoplasmic membrane and cell wall material Signup and view all the answers

What is the role of SEDS proteins in bacterial cell division?

Recruit proteins involved in cell wall growth Signup and view all the answers

What is the function of Pseudomonas aeruginosa polysaccharides in biofilm formation?

Increase pathogenicity and prevent antibiotic penetration Signup and view all the answers

What is the mechanism of action of Daptomycin?

Binding to phosphatidylglycerol residues of the bacterial cytoplasmic membrane, leading to pore formation, depolarization, and death Signup and view all the answers

Which antibiotic binds to pentapeptide precursor and prevents interbridge formation?

Vancomycin Signup and view all the answers

What are the genetically encoded classes of antibiotic resistance mechanisms?

Modification of drug target, enzymatic inactivation, removal via efflux pumps, metabolic bypasses Signup and view all the answers

What is the function of efflux pumps in antibiotic resistance?

Transporting various molecules, including antibiotics, out of the cell Signup and view all the answers

What makes the antibiotic target no longer essential in antibiotic resistance?

A metabolic bypass Signup and view all the answers

What is the role of persisters in antibiotic resistance?

Transiently tolerant to multiple antibiotics Signup and view all the answers

What do toxin-antitoxin (TA) modules encode?

A toxin which inhibits cell growth and an antitoxin that binds and counteracts the toxin Signup and view all the answers

What does HipA do in the stringent response pathway?

Phosphorylates glutamyl-tRNA synthetase, preventing the tRNA synthetase from charging amino acids Signup and view all the answers

What induces the stringent response pathway?

Uncharged tRNA entering the A site of the ribosome Signup and view all the answers

What allows persisters to exit the stringent response pathway?

Production of HipB (or other antitoxin) Signup and view all the answers

Study Notes

Bacterial Cell Division, Morphology, Biofilm Formation, and Antibiotic Targets

Chromosome segregation is necessary for distributing chromosomes and plasmids equally to daughter cells and for septum formation
Bacteria use the Par system and PopZ to distribute chromosomes and plasmids equally
The divisome, made up of Fts proteins, is essential for binary fission and involves the synthesis of new cytoplasmic membrane and cell wall material
Min proteins ensure the divisome forms at the center of the cell and prevent the FtsZ ring from forming elsewhere
Bacteria contain shape-determining proteins such as MreB and SEDS proteins
MreB is the major shape-determining factor in bacteria and recruits other proteins involved in cell wall growth
Bacterial cell morphologies vary, and morphology is typically unrelated to phylogeny
Peptidoglycan biosynthesis is a major feature of cell division, and bactoprenol carries peptidoglycan precursors through the cytoplasmic membrane
Biofilm formation involves initial attachment, cyclic di-GMP signaling, and gene expression for intercellular communication and extracellular polysaccharides
Pseudomonas aeruginosa forms a tenacious biofilm with polysaccharides that increase pathogenicity and prevent antibiotic penetration
Vibrio cholerae biofilm formation is triggered by low cell densities and repressed by high densities, and is more likely to occur in natural marine environments
Antibiotics target essential molecular processes such as DNA replication, RNA synthesis, translation, and protein synthesis, and some target specific bacterial structures and enzymes, like DNA gyrase, topoisomerase IV, and RNA polymerase

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Description

Test your knowledge of bacterial cell division, morphology, biofilm formation, and antibiotic targets with this quiz. From chromosome segregation to biofilm formation and antibiotic resistance mechanisms, this quiz covers essential concepts in bacterial biology.