Which step in transcription occurs first?

mth

Explanation:

858nf9

Transcription Initiation. The first step in transcription is initiation, when the RNA pol binds to the DNA upstream (5′) of the gene at a specialized sequence called a promoter (Figure 2a). In bacteria, promoters are usually composed of three sequence elements, whereas in eukaryotes, there are as many as seven elements

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D. Renal autoregulation.

Explanation:

It is a mechanism that is responsible for maintenance of relatively constant renal blood flow and GFR i.e glomerular filtration rate. It is the ability of the blood vessels to resist stretching during increased arterial pressure, a mechanism called myogenic mechanism. Whenever there is increase in blood pressure, the walls of arteriole tend to stretch. The wall of afferent arteriole in the glomerulus however responds to the stretch by contraction i.e. the diameter is reduced. This increases the resistance to flow, thereby reducing the GFR and renal flow during high BP.