Final answer:
RNA polymerase moves faster through G-C regions of DNA due to the stronger bond and greater stability of the RNA-DNA hybrid compared to A-T regions.
Step-by-step explanation:
The movement of RNA polymerase through A-T or G-C regions of DNA depends on various factors. RNA polymerase moves faster through G-C regions of DNA due to the stronger bond and greater stability of the RNA-DNA hybrid compared to A-T regions.
RNA polymerase moves faster through G-C regions of DNA because these regions have three hydrogen bonds between the nucleotides, which provides a stronger bond compared to the two hydrogen bonds in A-T regions of DNA. This stronger bond allows RNA polymerase to move more quickly through G-C regions.
In addition, the stability of the RNA-DNA hybrid formed during transcription is greater in G-C regions, which also contributes to the faster movement of RNA polymerase.