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- Question
Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to
Options- A. L-tryptophan
- B. D-L-tryptophan hydantoin
- C. L-serine
- D. pyruvate
- Correct Answer
- L-tryptophan
- 1. Ropiness in bread is caused by
Options- A. Bacillus subtilis
- B. A. niger
- C. R. nigricans
- D. P. expansum Discuss
- 2. Swimming towards a chemical of bacteria is termed as
Options- A. positive chemotaxis
- B. negative chemotaxis
- C. phototaxis
- D. magnetotaxis Discuss
- 3. The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to
Options- A. radiation
- B. desiccation
- C. both (a) and (b)
- D. extreme temperatures Discuss
- 4. The __________ of the influenza-enveloped virus appear to be involved in attachment to the host cell receptor site.
Options- A. fimbriae
- B. flagellae
- C. hemagluttinin
- D. neuraminidase Discuss
- 5. What information can be generated by interrupted mating experiments?
Options- A. Levels of DNA homology
- B. Bacterial genome maps
- C. DNA nucleotide sequences
- D. Proteomics of the bacteria Discuss
- 6. Which of the following is not correct for hepatitis A virus?
Options- A. It can be grown in cell cultures of primate and human cells
- B. It is one of the most stable viruses infecting humans
- C. It may cause hepatocellular carcinoma
- D. None of the above Discuss
- 7. The time in minutes at a specific temperature needed to kill a population of cells is the
Options- A. decimal reduction time
- B. thermal death point
- C. thermal death temperature
- D. F value Discuss
- 8. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
Options- A. ingestion of bacteria
- B. ingestion of mold
- C. ingestion of fungi
- D. all of these Discuss
- 9. Starch is an energy storage material characteristic of
Options- A. chlorophyta
- B. chrysophyta
- C. phaeophyta
- D. rhodophyta Discuss
- 10. The evolutionary record suggests that the first occurrence of multicellularity was in the kingdom
Options- A. Monera
- B. Protista
- C. Fungi
- D. Plantae Discuss
More questions
Correct Answer: Bacillus subtilis
Correct Answer: positive chemotaxis
Correct Answer: both (a) and (b)
Correct Answer: hemagluttinin
Correct Answer: Bacterial genome maps
Correct Answer: It may cause hepatocellular carcinoma
Correct Answer: F value
Correct Answer: ingestion of bacteria
Correct Answer: rhodophyta
Correct Answer: Protista
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