<span>The pulmonary vein is </span><span>the structure of the human heart which is a large vein that carries oxygenated blood from the lungs to the left atrium of the heart.</span>
Your answer would be Retrovirus
Answer: B) mRNA processing events that lead to different types of exons being spliced together
Explanation:
When DNA is transcribed into mRNA, a primary RNA or pre-mRNA transcript is obtained that includes introns and exons. For this pre-mRNA to give way to an mRNA it must undergo a maturation process of the mRNA, which
is basically to eliminate all introns primary transcript and then binding exons.
So RNA splicing is a post-transcriptional process of maturing RNA from which certain sequential fragments are removed. This process is very common in eukaryotes, and can occur in any type of RNA, although it is more common in mRNA.
Removal of introns and binding of exons in the mRNA occurs before leaving the nucleus. This process is known as splicing. <u>The alternative splicing of identical RNA transcripts into different cell types can produce different molecules of mature mRNA that are translated into different polypeptides.</u>
The three types of carrier-mediated transport are present facilitated diffusion, primary active transport, and secondary active transport which involve integral membrane proteins. Three characteristics are present in all kinds of carrier-mediated transport: saturation, stereospecificity, and competition.
The saturation is defined as the saturability of the carrier proteins which only have a finite number of solute binding sites.
Many binding sites be accessible at lower solute concentration concentrations, and as the concentration rises, so does the rate of transport. However, the number of accessible binding sites decreases and the rate of transport plateaus at high solute concentrations. Finally, saturation is attained at a point known as that of the transport maximum, or Tm, at which all of the binding are occupied.
To know more about the Mediated Transport Mechanism, click on the below link,
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