Fill in the blank promotor induction presence will not will

Fill in the blank:

promotor, induction, presence, will not, will, operon, repressor, repression, overabundance, operator, control region,

1. If the repressor is bound to the operator, then RNA polymerase______ transcribe the structural genes.

2. The ________ controls whether RNA polymerase can advance along the DNA strand or not.

3. The _______ operates differently depending on whether the operon is inducible or repressible.

4. An _________ controls the expression of functionally related genes and consists of a control region and structural genes.

5. ______ decreases expression of the structural genes. This typically occurs in response to an _____ of a substrate.

6. The _____ contains a promoter and an operator.

7. If the repressor is not bound to the operator, then RNA polymerase _____ transcribe the structural genes.

8. ______ increases expression of the structural genes. This typically occurs in response to the _______ of a substrate.

9. The ______ is the region of DNA where RNA polymerase initially binds.

Solution

The answers are given below and are mostly self explanatory and requires an understanding of an operon e.g the lac operon of E.coli which is an inducible operon

Fill in the blank:

promotor, induction, presence, will not, will, operon, repressor, repression, overabundance, operator, control region,

1. If the repressor is bound to the operator, then RNA polymerase will not transcribe the structural genes. [Explanation: when the repressor is bound to the operator, it blocks the path of RNA polymerase so RNA polymerase will not be able to transcribe the genes]

2. The operator controls whether RNA polymerase can advance along the DNA strand or not.

3. The repressor operates differently depending on whether the operon is inducible or repressible. [In an inducible operon, the repressor binds the operator in the absence of substrate where as in a repressible operon, the repressor binds the operator in the presence of the substrate]

4. An operon controls the expression of functionally related genes and consists of a control region and structural genes.

5. repression decreases expression of the structural genes. This typically occurs in response to an overabundance of a substrate.

6. The control region contains a promoter and an operator.

7. If the repressor is not bound to the operator, then RNA polymerase will transcribe the structural genes. [When the repressor is not bound, the operator is free and there is nothing preventing the RNA polymerase to transcribe the genes]

8. induction increases expression of the structural genes. This typically occurs in response to the presence of a substrate.

9. The promoter is the region of DNA where RNA polymerase initially binds.