a. A translation stop codon is added at the 3' end of the pre-mRNA.
c. A poly-A tail (50-250 adenine nucleotides) is added to the 3' end of the pre-mRNA.
d. Coding sequences called exons are spliced out by ribosomes.
Explanation:
In eukaryotes, during protein synthesis, the RNA must exit nucleus through the pores on the nuclear membrane and enter into the cytoplasm to undergo translation.
The exit processes of mRNA are: the 5’ capping, 3’ Poly-A tail, and pre-mRNA splicing.
The 5’capping is the initial step with addition of 7-methylguanosine cap to the 5’ end of the mRNA by phosphate linkage. This process protects the mRNA from degrading and helps to initiate translation processes.
The 3’ Poly-A tail step is the cleaving of pre-mRNA and addition of addition of around 200 A nucleotides or the 3’poly (A) tail to the mRNA by the poly (A) polymerase enzyme protein complex. This prevents pre-mRNA degradation, facilitates movement of mRNA to the cytoplasm, and initiates translation.
Pre-mRNA splicing is done to remove the introns from the mRNA because they are not part of function protein coding. The exons which take part in protein coding sequence are spliced once the introns are excised.
Finally, the resultant mRNA will exit the nucleus and enter the cytoplasm to undergo translation
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A Splint Is Placed Below An Injury Or Above One
<span>The physiological change that most differentiates men and women during middle adulthood is Answer: c
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These injuries are called concussions. A common injury that results as a blow to the head, a lot of times during sport, fights, or accidents. A sudden blow to the head causes shaking of the brain inside the skull causes acute symptoms, not usually dangerous, unless they are repeated, or it is super severe. It is usually met with headaches and unconsciousness, and is usually treated with rest.
Remember though that there are other injuries that could happen, which could cause severe bleeding of the brain, and so one should not be conservative when seeking treatment.
Answer:
Explanation:
Yes because she is performing research that will help her make an accurate diagnosis.
