Which of the following lists steps of mrna production in eukaryotes in the correct order? 1) transcription, exon splicing, 5' cap addition, passage through nuclear membrane enter answer 2) transcription, 5' cap addition, passage through nuclear membrane, exon splicing 3) 5' cap addition, exon splicing, passage through nuclear membrane, transcription 4) transcription, 5' cap addition, exon splicing, passage through nuclear membrane

4

Explanation:

5’ capping occurs on the primary transcript which is significant and preventing the RNA from being a target of exonucleases. Splicing of precursor RNA is used to remove introns (non-coding regions) to form a mature mRNA that can be exported from the nucleus to be translated by ribosomes in the cytoplasm.

answer; ///as energy flows through an ecosystem,energy (decreases) at each

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.