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- Question
Which of the following describes the effect of ionizing radiation on microbes?
Options- A. Changes the 3-dimensional structure of proteins to a 2-dimen-sional form
- B. Substantially decreases enzymatic activity, slowing microbial reproduction
- C. Induces electrons and protons to jump out of the molecules of the microbe
- D. None of the above
- Correct Answer
- Induces electrons and protons to jump out of the molecules of the microbe
- 1. Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.
Options- A. greater
- B. lesser
- C. approximately equal
- D. half Discuss
- 2. The transport medium for Vibrio cholerae can be
Options- A. Venkatraman-Ramakrishnan medium
- B. Selenite F broth
- C. Tetrathionate broth
- D. Nutrient broth Discuss
- 3. Which of the following statement is correct?
Options- A. Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
- B. Phosphate repression can be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
- C. Phosphate repression can be eliminated by optimization of nutrient medium, regulated medium must be used as production strains
- D. Phosphate repression can not be eliminated by optimization of nutrient medium, regulated medium must be used as production strains Discuss
- 4. Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive sulphur. At the end of 48 hours, it is expected to find the radioactive label located in
Options- A. DNA
- B. enzymes
- C. RNA
- D. all of these Discuss
- 5. Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?
Options- A. Pour plate
- B. Spread plate
- C. Both (a) and (b)
- D. Streak plate technique Discuss
- 6. All of the following species are considered coliforms except
Options- A. Enterobacter aerogenes
- B. Klebsiella pneumoniae
- C. Salmonella typhi
- D. Escherichia coli Discuss
- 7. Certain strains of Streptococcus lactis var. maltigenes may produce
Options- A. bitter flavor
- B. acid flavor
- C. burnt or caramel flavor
- D. none of these Discuss
- 8. Organisms with complex life cycles which include a mammalian host and an insect host and involves schizogony as part of the cycle belong to which phylum of Protozoa?
Options- A. Sarcomastigophora
- B. Microspora
- C. Apicomplexa
- D. Myxozoa Discuss
- 9. Water molds belong to which division?
Options- A. Ascomycota
- B. Basidiomycota
- C. Chytridiomycota
- D. Oomycota Discuss
- 10. Treatment of municipal water supplies is based upon
Options- A. coagulation, filtration, chlorination
- B. chlorination, filtration, coagulation
- C. filtration, coagulation, chlorination
- D. coagulation, chlorination, filtration Discuss
More questions
Correct Answer: greater
Correct Answer: Venkatraman-Ramakrishnan medium
Correct Answer: Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
Correct Answer: enzymes
Correct Answer: Both (a) and (b)
Correct Answer: Salmonella typhi
Correct Answer: burnt or caramel flavor
Correct Answer: Apicomplexa
Correct Answer: Oomycota
Correct Answer: coagulation, filtration, chlorination
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