For each of the following lac operon haploid genotypes identify the mode of tran

Question

For each of the following lac operon haploid genotypes identify the mode of transcription of operon genes and determine whether the strain is lac + or lac-.

1) I+P+O+Z+Y

2) I+P+OCZY+

3) IP+O+Z+Y+

4) I+PO+Z+Y+

5) I+P+O+ZY+

6) I+P+OCZ+Y

7) I+P+OCZ+Y+

answers choices to choose from:

a) is lac+ and the genes are constitutively transcribed.

b) is lac-and the genes are not transcribed

c) is lac + and the genes are not transcribed

d) is lac + and the genes are inducibly transcribed

e) is lac-and the genes are constitutively transcribed.

f) is lac-and the genes are inducibly transcribed

Explanation / Answer

1. Option d ; it is lac + and genes are inducibly transcribed .

2. Option a ; It is Lac + and genes are constitutively transcribed .

3. option f ; Itis lac - and the genes are inducibly transcribed .

4. Option C ;It is lac + and genes are not transcribed .

5. Option d ; it is lac + and genes are inducible

6. Option e ;is lac - and genes are constitutively transcribed

7. Option b is lac - and genes are not transcribed .

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