What happens, in detail, to an mRNA in the cytoplasm if you remove the poly-A tail?
Answer : The Deadennilation. For eukaryotic somatic cells, the poly(A) tail of most mRNAs in the cytoplasm is progressively shorter, and the mRNAs with shorter poly(A) tail are expressed less and degraded sooner. Once the poly(A) tail has been removed, the decapping complex eliminates the 5′ band, leading to a degradation of the RNA.
The poly(A) tail protects the mRNA from degradation, helps to export the mature mRNA to the cytoplasm and contributes to the binding of the proteins involved in the initiation of translation. Introns are separated from the premRNA before the mRNA is transferred to the cytoplasm.
During nuclear polyadenylation, at the end of the transcription, a poly(A) tail is attached to the RNA. On mRNAs, the poly(A) tail defends the mRNA molecule from enzymatic degradation in the cytoplasm and helps to end transcription, export of mRNA from the nucleus, and translation.
What happens, in detail, to an mRNA in the cytoplasm if you remove the poly-A tail?
In Eukaryotes, mRNA is supplemented with a sequence of adenine nucleotides (poly A tail) at one end and methylated guanine nucleotides at the 5’ end (cap). This is occurs A. Just before transcription. B. Just after transcription, in the nucleus. C. Just after transcription, in the cytoplasm. D. Just before translation in the cytoplasm.
What is the size of the processed mature mRNA of this gene if the poly-A tail is 83 as long?
QUESTION 6 The poly (A) tall on the mRNA of herpes simplex virus is generated by which of the following mechanisms: A. added by the polyadenylation enzyme of the virus B. stealing it from the host mRNAs OC. poliovirus mRNA does not have a poly (A) tail D.added by the polyadenylation enzymes of the host cell E. encoded in the genome QUESTION 7 The poly (A) tail on the mRNA of influenza virus is generated by which of the following...
(5 pts) The primary function of the poly A tail is which of the following? To protect the coding sequence from cellular exonucleases To protect the coding sequence from mutation To facilitate export of the mRNA out of the nucleus To facilitate binding of ribosomal subunits for translation All of the above
QUESTION 39 The poly (A) tall on the mRNA of poliovirus is generated by which of the following mechanisms: A encoded in the genome B. a run of UUUUUUU causes the RNA-dependent RNA polymerase to stutter oc. added by the polyadenylation enzymes of the host cell D. stealing it from the host cell E poliovirus mRNAs do not have a poly (A) tail QUESTION 40 Eukaryotic ribosomes cannot translate polycistronic mRNAs. Poliovirus utilizes which of the following strategies to solve...
What happens to the amoebas cytoplasm as it moves?
QUESTION 2 Match the term with its function B. - 5'cap E poly-A tail D. SnRNP A self-splicing intron B. Guides mRNA to ribosomes and protects it from exonuclease activity C. Structure in which introns are spliced out of hn RNA D. small nuclear RNA-protein complexes, involved in intron removal E. Necessary for RNA export from the nucleus A spliceosome C. group I intron
What is the function of the 3' poly-A sequence in eukaryotic mRNA? Select one: O a. Intron splicing signal. O b. Initial attachment site for ribosomes. O c. Translation termination. O d. Protection from cytosolic enzymes. What is the function of the 5' cap in eukaryotic mRNA? Select one: O a. Polyadenylation of the 5' end of the mRNA. b. Intron splicing signal. O c. It must be on the mRNA in order for the mature mRNA to be exported...
1.A The mRNA sequence below is the full length of the mature mRNA transcript. On the sequence, the 5'cap is indicated by (5'). The poly (A) tail is not shown. This transcript arrives at a ribosome. Determine the anticodon sequence for the first three tRNA used to make the polypeptide. Label the 5’and 3’ends on the tRNAs. 5' AAUCGAUGUAAUCCGCAUC 3' B. Hydrolysis reactions They do so by link monomers to form a polymer; adding a water molecule remove monomers from...
#59) During protein synthesis, what happens to the ribosome? A) attach to the mRNA molecule and travel along its length B) attach to the DNA molecule and travel along its length to produce an mRNA molecule C) Translate mRNA into tRNA D) Transcribe mRNA to tRNA E) Translate mRNA into DNA #60) if you digested the human genome (3 billion bp) with a 7-cutter restriction enzyme, approximately how many fragments would you get? A) 511461 B)183105 C)16384 D)88 E) None...