Which of the following lists steps of mrna production in eukaryotes in the correct order? transcription, 5' cap addition, addition of poly-a tail, passage through nuclear membrane, exon splicingtranscription, addition of poly-a tail, 5' cap addition, exon splicing, passage through nuclear membrane5' cap addition, addition of poly-a tail, exon splicing, passage through nuclear membrane, , 5' cap addition, addition of poly-a tail, exon splicing, passage through nuclear membrane

The correct order is: Transcription, 5' cap addition, addition of poly-A tail, exon splicing, passage through nuclear membrane

mRNA must undergo posttranscriptional modification in order to produce a mature, functional RNA molecule that can then leave the nucleus and be translated.

•5’cap addition or 5’ capping - It protects the mRNA from 5' degradation by exonucleases. Cap is also involved in ribosomal binding.

•Polyadenilation or addition of poly(A) tail – It also protects mRNA from degradation of 3’exonucleases.  A long poly(A) tail can also increase translation

•Exon splicing-This is a process in which introns are removed from the pre-mRNA and the exons connected to form a continuous molecule of mature mRNA.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

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