2) All of the following are TRUE statements concerming binary fission of microbi

Question

2) All of the following are TRUE statements concerming binary fission of microbial cells EXCEPT A) the chromosome of the cell is replicated. B) elongation of the cell occurs and the chromosomes are pushed apart. C) a septum is formed across the midline of the cell. D) daughter cells produced can be of different sizes. 3) All of the following are targets of currently used antibioties EXCEPT A) DNA synthesis. B) biofilm formation. C) transcription. D) translation. 4) Why is the presence of a cell wall significant from a clinical standpoint? A) All types of cells have a cell wall, and it makes identification of the causative agent of disease difficult. B) The cell wall protects microorganisms from destruction by the immune system. C) Animal cells do not have cell walls, so antibiotics that target cell walls can selectively destroy invading microorganisms. D) Only gram-negative Bacteria have cell walls.

Explanation / Answer

2.D.Ans) Daughter cells produced can be different size

All the unicellular prokaryotes such as bacteria propagate by the binary fission. Before the start of binary fission, the DNA is duplicated by the process called replication. After duplication of DNA the cell grow twice it’s original size and septum is formed and which equally divides the mother cell into two equal sized daughter cells.

3.B. Ans) biofilm formation

Adherence of a group of microorganisms with each other and to the surface is called biofilm. Antibiotics do not show any action on the formation of biofilm but they act on them by selectively inhibiting the cellular processes like replication (Nalidixic acid inhibit replication)   transcription (Rifampmycin inhibit transcription) and translation (streptomycin inhibit translation).

4.C.) Animal cells do not have cell walls so antibiotics that target cell walls can selectively destroy invading microorganisms.

All animal cells do not possess the cell wall but the bacteria have the cell wall which is made up of peptidoglycan. Penicillin is the antibiotic which inhibits bacterial growth by inhibiting the cell wall synthesis.

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