Discussion
Home ‣ Microbiology ‣ Micro Organisms See What Others Are Saying!
- Question
The first organism in most natural food chains is
Options- A. a herbivore
- B. a decomposer
- C. photosynthetic
- D. carnivorous
- Correct Answer
- a herbivore
- 1. DNA gyrase is inhibited by
Options- A. tetracycline
- B. nalidixic acid
- C. both (a) and (b)
- D. cephalosporin Discuss
- 2. The average size of cells during the exponential phase of growth is
Options- A. greater than the lag phase
- B. lesser than the lag phase
- C. equal to the lag phase
- D. none of these Discuss
- 3. The red color of meat, called its bloom, may be changed to shades of green, brown or grey as a result of production of oxidizing compounds by bacteria. Which of the following species are reported to cause the greening of sausage?
Options- A. Lactobacillus
- B. Leuconostoc
- C. Both (a) and (b)
- D. Pseudomonas Discuss
- 4. Who was the first scientist to observe the antibiotic and therapeutic properties of penicillin?
Options- A. Louis Pasteur
- B. Alexander Fleming
- C. S. C. Prescott
- D. E. P. Abraham Discuss
- 5. When a substance is added to a solid medium which inhibits the growth of unwanted bacteria but permits the growth of wanted bacteria, it is known as
Options- A. differential medium
- B. enriched medium
- C. enrichment medium
- D. selective medium Discuss
- 6. The term facultative anaerobe refers to an organism that
Options- A. doesn't use oxygen but tolerates it
- B. is killed by oxygen
- C. uses oxygen when present or grows without oxygen when absent
- D. requires less oxygen than is present in air Discuss
- 7. Starvation proteins are produced by a culture during which of the following segments of the growth curve?
Options- A. Lag phase
- B. Exponential phase
- C. Stationary phase
- D. Death phase Discuss
- 8. Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as
Options- A. fastidious hetrotrophs
- B. chemo-lithotrophs
- C. chemotrophs
- D. photo-organotrophs Discuss
- 9. Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the
Options- A. microbial loop
- B. Winogradsky column
- C. Redfield ratio
- D. Gibbs free energy Discuss
- 10. Agar is used for solidifying culture media because
Options- A. it does not affect by the growth of bacteria
- B. it does not add to the nutritive properties of the medium
- C. the melting and solidifying points of agar solution are not the same
- D. all of the above Discuss
More questions
Correct Answer: nalidixic acid
Correct Answer: lesser than the lag phase
Correct Answer: Both (a) and (b)
Correct Answer: Alexander Fleming
Correct Answer: selective medium
Correct Answer: uses oxygen when present or grows without oxygen when absent
Correct Answer: Stationary phase
Correct Answer: fastidious hetrotrophs
Correct Answer: microbial loop
Correct Answer: all of the above
Comments
There are no comments.More in Microbiology:
Programming
Copyright ©CuriousTab. All rights reserved.