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OPERON MCQs

Total Questions : 20 | Page 1 of 2 pages
Question 1. What happen to lac operon in the absence of lactose?
  1.    lac operon is switched off
  2.    lac operon is active
  3.    repressor protein bind to promoter
  4.    RNA polymerase binds to operator
 Discuss Question
Answer: Option A. -> lac operon is switched off
Question 2. What is the enzyme that detoxifies other molecules entering the cell via the permease?
  1.    β-galactosidase
  2.    β-galactoside primase
  3.    β-galactoside permease
  4.    β-galactoside transacetylase
 Discuss Question
Answer: Option D. -> β-galactoside transacetylase
Question 3. An operon consists of all the the following EXCEPT
  1.    operator
  2.    promoter
  3.    regulatory gene
  4.    structural genes
 Discuss Question
Answer: Option C. -> regulatory gene
Question 4. What is the basic role of mRNA?
  1.    transfer the amino acids to the ribosome
  2.    transfer the amino acids to the nucleus
  3.    transfer the DNA message to the ribosome
  4.    transfer the mRNA message to the nucleus
 Discuss Question
Answer: Option C. -> transfer the DNA message to the ribosome
Question 5. Which of the following is active in the absence of lactose?
  1.    lacI
  2.    lacZ
  3.    lacY
  4.    lacA
 Discuss Question
Answer: Option A. -> lacI
Question 6. What is the name of the stretch of DNA where RNA polymerase binds?
  1.    operator
  2.    promoter
  3.    enhancer
  4.    origin
 Discuss Question
Answer: Option B. -> promoter
Question 7. Which sentence is TRUE about structural genes in the absence of lactose?
  1.    Transcription occurred to synthesis enzyme
  2.    Translation occurred to synthesis mRNA
  3.    Transcription occurred to synthesis mRNA
  4.    No transcription and translation occurred
 Discuss Question
Answer: Option D. -> No transcription and translation occurred
Question 8. How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?
  1.    The two different cells become mutated
  2.    The proteins expressed in each cell are different
  3.    They actually have different DNA in the two types of cells.
  4.    The genome of the different cells changes
 Discuss Question
Answer: Option B. -> The proteins expressed in each cell are different
Question 9. The lac Z gene codes for:
  1.    permease
  2.    beta-galactosidase
  3.    repressor of lac operon
  4.    transacetylase
 Discuss Question
Answer: Option B. -> beta-galactosidase
Question 10. RNA is synthesized on a DNA template in a process called ______, which utilizes the enzyme _______
  1.    translation, RNA polymerase
  2.    transcription, DNA polymerase
  3.    transcription, RNA polymerase
  4.    replication, DNA polymerase
 Discuss Question
Answer: Option C. -> transcription, RNA polymerase

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