Questions and answers for exam Preparation

MCQs

Total Questions : 241 | Page 1 of 25 pages

Question 1. Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ?

Parasitic bacteria have very large genomes
Parasites have a definite genomic sequence similar to viruses
Mitochondria have evolved from endosymbiotic bacteria
All bacteria evolved from viruses

Discuss Question

Answer: Option C. -> Mitochondria have evolved from endosymbiotic bacteria
Answer: (c).Mitochondria have evolved from endosymbiotic bacteria

Question 2. In the time since E. coli and Salmonella diverged evolutionarily

there has been little change in either genome
E. coli has acquired many genes via horizontal transfer
E, coli has lost approximately 50% of its genome
none of these

Discuss Question

Answer: Option C. -> E, coli has lost approximately 50% of its genome
Answer: (c).E, coli has lost approximately 50% of its genome

Question 3. The physical nature of genomes is studied under

structural genomics
comparative genomics
proteo genomics
functional genomics

Discuss Question

Answer: Option A. -> structural genomics
Answer: (a).structural genomics

Question 4. Why the bacterium Treponema pallidum is difficult to culture?

Because it requires a great deal of water to reproduce
Because it is unable to use carbohydrates as an energy source
Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Because it requires extremely low temperature at which water freezes

Discuss Question

Answer: Option C. -> Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Answer: (c).Because it lacks the genes needed for TCA cycle and oxidative phosphorylation

Question 5. The species of bacteria, which possesses 250 genes for lipid biosynthesis is

M. genitalium
M. tuberculosis
E. coli
H. influenzae

Discuss Question

Answer: Option B. -> M. tuberculosis
Answer: (b).M. tuberculosis

Question 6. When composite transposons are formed

a small deletion occurs in the transposase gene of an IS element
a small deletion occurs in the transposase gene of an IS element and plasmid is integrated
an IS element integrates with another IS element with the help of a plasmid
two IS elements integrate into a chromosome with only a small distance separating them

Discuss Question

Answer: Option D. -> two IS elements integrate into a chromosome with only a small distance separating them
Answer: (d).two IS elements integrate into a chromosome with only a small distance separating them

Question 7. Which of the following plamids do not possess information for self transfer to another cell?