All of the following terms apply to microbial killing except a) sterilization b)
ID: 98598 • Letter: A
Question
All of the following terms apply to microbial killing except a) sterilization b) microbicidal c) bactericidal d) fungistatic Which of the following could NOT cause a change in the mRNA "reading frame" a) insertion sequence b) base-pair substitution c) base addition d) base deletion Which one of the following enzymes would not be involved with excision repair of DNA? a) DNA polymerase b) nucleases c) RNA polymerase d) DNA ligase Which of the following best describes a plasmid? a) A gene within the chromosome b) -Small circular piece of DNA outside the chromosome c) The genetic material of a bacteriophage d) Part of bacterial ribosomes e) A single, linear strand Which of the following is NOT involved in bacterial conjugation? a) bacteriophage b) F + cells c) F- cells d) plasmids e) sex pili Absence of all life forms: a) clean b) disinfected c) sterile d) aseptic e) sanitizedExplanation / Answer
25.d.Fungistatic is the term which is used to inhibit the growth of fungi.It is not used to kill the fungi.
26.b. Base pair substitution will not cause any change in reading frame as one base is substituted with the other and there is no change in the number of bases.In insertion,addition or deletion change in number of bases occur hence the reading frame gets changed.
27.c.RNA Polymerase is not involved in excision repair system as it is required for RNA synthesis which is not needed in excision base repair.
28b.Small circular piece of extrachromosomal material present independently of main chromosome is plasmid.Sometimes it integrates within the main chromosome, then it is called episome.
29.a.Bacterial conjugation is the transfer of genetic material between bacterial cells by direct cell-to-cell contact or by a bridge-like connection between two cells.In this bacteriophages are not involved.
30.c. sterile means absence of all life forms.