Discussion
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- Question
Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited.
Options- A. bile salts
- B. low concentration of various dyes
- C. sugars
- D. low levels of nitrogen
- Correct Answer
- bile salts
- 1. NaCl can act as
Options- A. antagonist at optimal concentrations
- B. synergistically if added in excess of optimum level
- C. Both (a) and (b)
- D. None of the above Discuss
- 2. Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have
Options- A. insufficient nutrients
- B. low pH
- C. high concentration of solutes
- D. toxic alkaline chemicals Discuss
- 3. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
- 4. Frustules made of silica are characteristic of
Options- A. euglenoids
- B. diatoms
- C. desmids
- D. seaweeds Discuss
- 5. A heterocyst is
Options- A. a type of spore
- B. a terminally differentiated cell that fixes nitrogen
- C. the progenitor of cyanobacterial vegetative cells
- D. a cell that carries out oxygenic photosynthesis Discuss
- 6. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
Options- A. nitrification
- B. denitrification
- C. nitrogen fixation
- D. ammonification Discuss
- 7. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
Options- A. Chromaticum
- B. Chlorobium
- C. Both (a) and (b)
- D. Rhodomicrobium Discuss
- 8. Which of the following is capable of oxidizing sulfur to sulfates?
Options- A. Thiobacillus thiooxidans
- B. Desulfotomaculum
- C. Rhodospirillum
- D. Rhodomicrobium Discuss
- 9. Which of the following is correct?
Options- A. Mycorrhizae are fungi that form a mutually beneficial (symbiotic) relationship with plant roots
- B. The fungi aid in transmitting nutrients and water to the plant roots
- C. The increased nutrient availability from mycorrhizae is thought to be due to the additional absorbing surface provided by the fungi
- D. All of the above Discuss
- 10. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
Options- A. Saccharomyces cerevisiae
- B. VA Mycorrhiza
- C. Candida torulopsis
- D. Aspergillus niger Discuss
More questions
Correct Answer: Both (a) and (b)
Correct Answer: high concentration of solutes
Correct Answer: Desulfotomaculum
Correct Answer: diatoms
Correct Answer: a terminally differentiated cell that fixes nitrogen
Correct Answer: denitrification
Correct Answer: Both (a) and (b)
Correct Answer: Thiobacillus thiooxidans
Correct Answer: All of the above
Correct Answer: VA Mycorrhiza
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