1. Which of the following is the most common reproduction method observed in bac
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1. Which of the following is the most common reproduction method observed in bacteria and archaea? A Binary fission Budding C. Fragmentation D. Meiosis E. Spore formation 2. Which of the following is NOT true of the bacterial cell cycle? DNA is replicated MreB segregates daughter DNAS C. Septum is formed D. Z-ring is formed at each pole E. All of the above are true 3. Which of the following is NOT true of binary fission? A. DNA replication begins at the origin of replication B. DNA replication terminates at the terminus C. A septum forms at midcel D. It requires no energy E. Most prokaryotes reproduce by binary fission 4. Which of the following is the correct order for binary fission? A. A septum forms at midcell, the cell elongates, replicates its chromosome, and separates the chromosome into the two parts of the cell B. The cell elongates, replicates its chromosome, and separates the chromosome into the two parts of the cell, and a septum forms at midcell C. The cell replicates its chromosome, separates the chromosome into two parts of cell, the cell elongates, and a septum forms at midcell D. The cell elongates, a septum forms at midcell, the cell replicates its chromosome, and separates the chromosome into the two parts of the cell E. None of the above is correct 5. Which of the following is NOT true of cytokinesis? A. It is directed by a protein called Ftsz B. FtsZ proteins polymerize into a Z ring on the cytoplasmic membrane C. MinCDE is responsible for a Z ring formation at the center of a cell Additional proteins are added to the Z ring to form the divisome E. D. FtsZ is a prokaryotic homologue to the eukaryotic protein actin 6. The second round of DNA replication usually begins once the first round of replication is completed. A. True B. FalseExplanation / Answer
3) The incorrect statement is, option D, It requires no energy. The option is false because always replication is an energy draining process.
All other staements are true. Most prokaryotes replicates by binary fission.The replication in prokaryotes begins at origin of replication or OriC with a single origin of replication and the replication fork moving in two opposite directions. And the replication terminates at terminus region. After the chromosome replication the cell divides into two by the formation of a septum at the middle of the cell.
4) The correct option is C.
The different events in prokaryotic binary fission can be arranged in a sequencial order as follows :
5) The option which is not true for Cytokinesis is option E, that is FtsZ is a prokaryotic homologue to the eukaryotic protein actin.
This statement is false because, FtsZ is a prokaryotic protein which is homologue to protein Tubulin in Eukaryotes. Tubulin in eukayotes is the building block of Microtbules which makes the mitotic spindle fibers which helps in eukaryotic chromosome seperation.
In prokaryotes the Cytokinesis is mediated by a protein called FtsZ. The formation of a ring that is composed of repeating units of FtsZ helps in partitioning the cell. It also triggers the accumulation of other proteins to the site to form a divisome.The Min system consists of 3 proteins, Min C, Min D and Min E. This system of Min CDE inhibits the FtsZ present in the poles and thereby promotes in correct and exact localisation of FtsZ in the middle of the cell ie, precisely locates FtsZ to the mid zone of the cell. So that the septum forms exactlty in the middle and cell divides into two equal sized daughter cells.
6) The statement is False. Always the second round of replication in prokaryotes begin even before the first cell division is completed. This is how the generation time of 40 mnts in bacteria is reduced to approximately 20 mnts. This is the reason why a large number of bacterial copy is produced within a short span of time.
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