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- Question
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
- Correct Answer
- ADP ribosylation of a G protein that locks it into an active form that stimulates adenylate cyclase to make cAMP
- 1. The word, used for the small solid supports onto which are spotted hundreds of thousands of tiny drops of DNA that can be used to screen gene expression, is
Options- A. southern blot
- B. cloning library
- C. DNA microarrays
- D. northern blot Discuss
- 2. A characteristic of protein synthesis in both the archaea and eukarya is
Options- A. transcription and translation are coupled
- B. translation is inhibited by diphtheria toxin
- C. proteins are synthesized from D-, rather than L-, isomers of amino acids
- D. the initiator tRNA is charged with N-formyl-methionine Discuss
- 3. The favouring conditions for floaters is
Options- A. high intial amounts of salt
- B. thick skin that does not allow gas to diffuse out
- C. both (a) and (b)
- D. none of these Discuss
- 4. The envelope of which of the following viruses is derived from the host cell nucleus?
Options- A. Paramyxoviruses
- B. Retroviruses
- C. Orthomyxoviruses
- D. Herpesviruses Discuss
- 5. The viral nucleocapsid is the combination of
Options- A. genome and capsid
- B. capsid and spikes
- C. envelope and capsid
- D. capsomere and genome Discuss
- 6. Quinolones are
Options- A. antimetabolites
- B. penicillin derivatives
- C. bacteriostatic
- D. broad-spectrum Discuss
- 7. The role of molecular chaperones is to
Options- A. facilitate binding of ribosomes to mRNA
- B. degrade newly synthesized polypeptides that contain inaccurate sequences
- C. facilitate binding of RNA polymerase to DNA
- D. aid a newly synthesized polypeptide in folding to its proper shape Discuss
- 8. During the carboxylation phase of the Calvin cycle, CO2 combines with
Options- A. ribulose 1,5 - bisphosphate
- B. phosphoglyceraldehyde
- C. pyruvic acid
- D. oxaloacetic acid Discuss
- 9. Black kraut is caused by
Options- A. the plant enzymes
- B. the micro-organisms
- C. the combined actions of plant enzymes and micro-organisms
- D. none of the above Discuss
- 10. Bacterial cells susceptible to penicillium can be protected from destruction if the medium in which they are exposed is of
Options- A. high osmotic pressure
- B. low osmotic pressure
- C. moderate osmotic pressure
- D. high surface tension Discuss
More questions
Correct Answer: DNA microarrays
Correct Answer: proteins are synthesized from D-, rather than L-, isomers of amino acids
Correct Answer: both (a) and (b)
Correct Answer: Herpesviruses
Correct Answer: genome and capsid
Correct Answer: broad-spectrum
Correct Answer: aid a newly synthesized polypeptide in folding to its proper shape
Correct Answer: ribulose 1,5 - bisphosphate
Correct Answer: the combined actions of plant enzymes and micro-organisms
Correct Answer: high osmotic pressure
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