Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor? the repressor binds directly to the rna polymerase to block the closed-to-open transition at initiation. the repressor induces a conformational change in the polymerase that accelerates the closed-to-open transition. the binding of the repressor sterically occludes binding of the rna polymerase to the promoter?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Which represents a negative impact of technology

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point