In bacteria, a repressor is a _________________________ that binds to the ______

Question

In bacteria, a repressor is a _________________________ that binds to the __________________ on the DNA. The binding of the molecule ______________________ transcription.

a. small effector molecule, promotor, increases

b. protein, operator, decreases  

c. small effector molecule, operator, decreases

Which of the following is a common motif found in transcription factors?

a. double-helix

b. helix-turn-helix

c. magnesium finger

Alternative splicing may occur in the processing of:

a. DNA single strands

b. DNA double strands

c. pre-mRNA

What is the function of the polyA-binding protein.

a. ribosomal recognition and binding  

b.stability of the mRNA

c. recognition of tRNAs

Explanation / Answer

1.b protein, operator, decreases( binds to operator and blicks the binding of RNA polymerase to the promoter and decrease transcription

2.b. Helix turn helix

3. Pre mRNA

4. A

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