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1. If the bacteria doubles itself in 5 minutes, what would be number of bacteria at end of 20 minutes if you start with 4 bacteria (June 2006)
a) 64b) 32c) 48d) 16
2. The percentage of protein coding sequence in E.coli is (June 2006)
a) 2%b) 0.2%c) 70%d) 30%
3. Among the following which is considered as the best indicator of water pollution(June 2006)
a) Bacillusb) Clostridiumc) E.colid) Paramecium
4. The F+ segments of bacteria may be transferred to F- bacteria by the process of (June 2006)
a) Conjugationb) transformationc) transductiond) fragmentation
5. It has been observed that in bacterial colonies bacteria often secrete toxins at high population density to check the population size. This phenomenon is termed as (June 2006)
a) population controlb) Allelopathyc) intra specific competitiond) Quorum sensing
6. If bacterial genome and plasmid are allowed to replicate in same manner then among the following which is characteristic feature of meiosis I (June 2006)
a) bacteria genome will replicate fasterb) plasmid will replicate fasterc) both will replicate in same timed) depends on GC content
7. A prophage is (Dec 2006)
a) DNA of lysogenic phage inserted into host chromosomeb) is a stage of cell cyclec) lambda phage DNAd) plasmid
8. Bacteria propels with the help of (June, 2008)
a) myosinb) actinc)cytoskeletond) flagella made of flagellin
9. In operons, if repressor binds to operator, it will lead to (June, 2008)
a) initiation of transcriptionb) enhancement of transcriptionc) blocks transcriptiond) differential gene expression
10. The glycocalyx around cell membrane can be determined by? (June, 2009)
a) Iodineb) crystal violetc) lectinsd) saffranin
11. Among the following which activity is absent in bacterial DNA polymerase I (June, 2006)
a) 3’-5’ exonucleases activityb) 5’-3’ exonucleases activityc) 3’-5’ polymerase activityd) 5’-3’ polymerase activity
12. Transduction has been used extensively for genome mapping for bacteria, which of the following process is useful for gene mapping? (June 2009)
a) bacterial lysisb) generalised transductionc) specialized transductiond) site specific recombination
13. Mycobacterium tuberculosis causes disease by entering into host cell and not allowing the endosome to mature into (June, 2009)
a) ERb) Lysosomec) peroxisomed) granulocytes
14. Exponential growth in bacteria would be expected during (June, 2009)
a) lag phaseb) stationary phasec) log phased) deceleration pahse
15. Sendai virus enters host cell by (june,2009)
Useful Linksa) phagocytosisb) Receptor mediated endocytosisc) cell fusiond) cell fusionAnswers
- a) 64
- c) 70%
- c) E.coli
- a) Conjugation
- d) Quorum sensing
- b) plasmid will replicate faster
- a) DNA of lysogenic phage inserted into host chromosome
- d) flagella made of flagellin
- c) blocks transcription
- c) lectins
- c) 3’-5’ polymerase activity
- b) generalised transduction
- b) Lysosome
- c) log phase
- c) cell fusion
Tags:
CSIR-UGC-NET-JRF
Life Sciences
Microbiology Previous Questions
ransduction
Sendai virus. Mycobacterium tuberculosis