What are the three mechanisms by which transcription factors regulate eukaryotic gene expression

1.       They act as activators of transcription. This is through increasing the affinity of the RNA polymerase on the promoter

2.       They could act as repressors. This way, when they bind to their active sites, they repress the binding of the RNA polymerase on the promoter

3.        Transcription factors at one site could affect transcription of genes on another site on the DNA. The flexibility of the DNA (by forming loops) allows for this phenomenon.

answer; i believe that the correct answer is (light);

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )