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
.
Answer:
D
Explanation:
<em>d. An amino acid chelate is an acid-buffering agent used to counter excess acidity in the stomach.</em>
The chelates can pass through the stomach and resist its natural acidity (HCl), due to its stronger chemical bonds. An amino acid in its chelate form like CaCO_3 simultaneously counters excess acidity, because of its alkaline nature. After passing the stomach, it is absorbed in the small intestine. Therefore, a chelated Calcium Carbonate can be used as an acid buffering agent, to lower the acidity levels of the stomach.
Answer:
is a blind, neutral experiment
Explanation:
In Science, to have results in which you can trust, always need to be a comparative ( in this case the creatinine supplementation and the other powder). To be a serious experiment, need to have the same activities, duration and the participants need to "blind" to know which substance they are really taking, so they need to train as usual, and after some time the results will show if there is a significant difference.
<span>The three tips to start a healthy dating relationship are trust, no controlling, and space. These are needed so the persons who are in dating will value his or her self also. There should be a communication between the two and mental, physical, emotional, and spiritual well-being for them to stay longer.</span>
