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- Question
The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?
Options- A. Indole test
- B. Methyl red test
- C. Citrate utilization test
- D. Voges-Proskauer test
- Correct Answer
- Methyl red test
- 1. Which of the following best represents the hierarchy of levels of biological classification?
Options- A. Phylum, kingdom, class, order, genus, species, family
- B. Kingdom, phylum, class, order, family, genus, species
- C. Kingdom, phylum, family, class, order, genus, species
- D. Class, order, kingdom, phylum, family, genus, species Discuss
- 2. Cholera toxin is an A-B type toxin in which the B portions bind to a receptor on a host cell and the A portion enters the cell to cause
Options- A. ADP ribosylation of adenylate cyclase that stops production of cAMP
- B. ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
- C. cleavage of rRNA that results in disruption of ribosome function
- D. ADP ribosylation of guanylate cyclase that stimulates production of cGMP Discuss
- 3. Which of the following statement is correct?
Options- A. The size and sequence of introns can be deduced from the cDNA sequence
- B. Restriction endonuclease can cleave ss and dsDNA both
- C. Restriction fragment length polymorphism (RFLP) is usually formed in coding sequence of a gene
- D. Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide Discuss
- 4. Which of the following(s) is/are the determinants of antigenicity?
Options- A. Chemical nature
- B. Size of the antigen
- C. Foreignness
- D. All of these Discuss
- 5. Organic molecules that increase the rate of metabolic reactions with themselves changing are known as
Options- A. coenzymes
- B. enzymes
- C. substrates
- D. reactants Discuss
- 6. Which of the following is correct for isoantigens?
Options- A. They are antigens found in all members of different species
- B. They are antigens found in some members of a species
- C. They are antigens found in all members of a species
- D. They are antigens found in some members of different species Discuss
- 7. R factors involved in plant-microbe interactions are
Options- A. plant proteins
- B. bacterial proteins
- C. essential for transfer of DNA to plant cells
- D. also called opines Discuss
- 8. In the extracellular medium, DNA-degrading enzymes would likely be to prevent transfer of DNA by
Options- A. conjugal transfer by a self-transmissible plasmid
- B. generalized phage transduction
- C. natural transformation
- D. none of the above Discuss
- 9. When composite transposons are formed
Options- A. a small deletion occurs in the transposase gene of an IS element
- B. a small deletion occurs in the transposase gene of an IS element and plasmid is integrated
- C. an IS element integrates with another IS element with the help of a plasmid
- D. two IS elements integrate into a chromosome with only a small distance separating them Discuss
- 10. In which of the following case a large lattice is formed?
Options- A. Antibody is in excess
- B. Antigens and antibodies are in optimal proportion
- C. Antigen is in excess
- D. None of these Discuss
More questions
Correct Answer: Kingdom, phylum, class, order, family, genus, species
Correct Answer: ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
Correct Answer: Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide
Correct Answer: All of these
Correct Answer: enzymes
Correct Answer: They are antigens found in some members of a species
Correct Answer: plant proteins
Correct Answer: natural transformation
Correct Answer: two IS elements integrate into a chromosome with only a small distance separating them
Correct Answer: Antigens and antibodies are in optimal proportion
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