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Gene regulation governing lactose operon...

Gene regulation governing lactose operon of E. coli that involves the lac I gene product is

A

Positive and inducible because it can be induced by lactose a

B

Negative and inducible because repress or protein prevents transcription

C

Negative and repressible because repress or protein prevents transcription

D

Feedback inhibition because excess of B-galactosidase can switch off transcription

Text Solution

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The correct Answer is:
B
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ICSE-MOLECULAR BASIS OF INHERITANCE-OBJECTIVE TYPE QUESTIONS (MULTIPLE CHOICE QUESTION (MCQ)
  1. The one aspect which is not a salient feature of genetic code, it its ...

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  2. The process of copying genetic information from one strand of the DNA ...

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  3. In the Lac operon system, Beta-galactosidase is coded by

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  4. Match the codons with their respective amino acids and choose the corr...

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  5. Consider the following statements. I. rRNA provides the template for...

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  6. In bacteria, the formation of peptide bond during translation is effec...

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  7. At 5’ end of a polynucleotide chain

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  8. Reverse transcriptase is also called

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  9. During chain elongation, peptide bond is formed between carboxyl group...

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  10. Balbiani rings are sites of

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  11. How many effective codons are there for the synthesis of twenty amino ...

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  12. Which one fo the following structural formulae of two orgainc compo...

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  13. What are those structures that appear as 'beads'-on-string' in the chr...

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  14. Gene regulation governing lactose operon of E. coli that involves the...

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  15. In sea urchin DNA, which is double stranded, 17% of the bases were sho...

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  16. Which one of the following is the starter codon?

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  17. The amino acid Tryptophan is the precursor for the synthesis of

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  18. Which of the following statements is not true for cancer cells in rela...

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  19. Match the terms in column I with their description in column II and ch...

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  20. A complex of ribosomes attached to a single strand of RNA is known as

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